Wolfgang Löffler

Quantum Optics
Huygens Laboratory
Leiden University, The Netherlands

phone: +31-(0)71 527 5931
loeffler@physics.leidenuniv.nl

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research:

quantum dot cavity-QED

opto mechanics

4-photon OAM entanglement

fundamentals of quantum mechanics

twisted-light scattering

spatial entanglement

optical coherence

beam shifts

spin-optoelectronics

Table of Contents

Link to my Google Scholar profile

Book

  1. Electrical preparation of spin-polarized electrons in semiconductor quantum dots
    W. Löffler, Doctoral Thesis, University of Karlsruhe (2008).
    (pdf link)

Pre-prints

  1. Polarized quantum dot cavity-QED and single photons
    H.J. Snijders, D.N.L. Kok, M.F. van de Stolpe, J. A. Frey, J. Norman, A. C. Gossard, J. E. Bowers, M.P. van Exter, D. Bouwmeester, W. Löffler
    Arxiv:1811.10571
  2. Probing interacting two-level systems with rare-earth ions
    Dapeng Ding, David van Driel, Lino M. C. Pereira, Jared F. Bauters, Martijn J. R. Heck, Gesa Welker, Michiel J. A. de Dood, André Vantomme, John E. Bowers, Wolfgang Löffler, Dirk Bouwmeester
    Arxiv:1811.05248
  3. Reply to comment on 'Spatial Coherence and Optical Beam Shifts'
    W. Löffler, A. Aiello, and J.P. Woerdman
    Phys. Rev. Lett., accepted, Arxiv:1403.2164 (2014)

Articles in regular journals

  1. Electro-optic polarization tuning of microcavities with a single quantum dot
    J. A. Frey, H. J. Snijders, J. Norman, A. C. Gossard, J. E. Bowers, W. Löffler, D. Bouwmeester
    Opt. Lett. 43, 4280 (2018), Arxiv:1805.03387
  2. Observation of the Unconventional Photon Blockade
    H.J. Snijders, J. A. Frey, J. Norman, H. Flayac, V. Savona, A. C. Gossard, J. E. Bowers, M. P. van Exter, D. Bouwmeester, W. Löffler
    Phys. Rev. Lett. 121, 043601 (2018), Editors suggestion: A Double Take on Unconventional Photon Blockade", Arxiv:1803.10992
  3. Strong Thermo-mechanical Squeezing in a far detuned Membrane-in-the-middle System
    Sameer Sonar, Vitaly Fedoseev, Matthew Weaver, Fernando Luna, Elger Vlieg, Harmen van der Meer, Dirk Bouwmeester, Wolfgang Löffler
    Phys. Rev. A 98, 013804 (2018), Arxiv:1805.09897
  4. Phonon Interferometry for Measuring Quantum Decoherence
    Matthew J. Weaver, David Newsom, Fernando Luna, Wolfgang Löffler, Dirk Bouwmeester
    Phys. Rev. A 97, 063832 (2018), Editors suggestion, Arxiv:1802.08399
  5. A fiber coupled cavity QED source of identical single photons
    H. J. Snijders, J. A. Frey, J. Norman, V. P. Post, A. C. Gossard, J. E. Bowers, M. P. van Exter, W. Löffler, D. Bouwmeester
    Phys. Rev. Applied (Letter) 9, 031002 (2018), Arxiv:1705.05876
  6. Scattering media characterization with phase-only wavefront modulation
    F. Mariani, W. Löffler, M. Aas, O. S. Ojambati, P. Hong, W. L. Vos, and M. P. van Exter
    Opt. Express 26, 2369 (2018)
  7. Purification of a single photon nonlinearity
    H. Snijders, J. A. Frey, J. Norman, M. P. Bakker, E. C. Langman, A. Gossard, J. E. Bowers, M. P. van Exter, D. Bouwmeester, W. Löffler
    Nat. Commun. 7, 12578 (2016), Arxiv:1604.00479
  8. Observation of Four-photon orbital angular momentum entanglement
    B. C. Hiesmayr, M. J. A. de Dood, and W. Löffler
    Phys. Rev. Lett. 116, 073601 (2016), Editor's suggestion "Entangled Quadruplet", Arxiv:1508.01480
  9. Homodyne detection of coherence and phase shift of a quantum dot in a cavity
    M. P. Bakker, H. Snijders, W. Löffler, A. V. Barve, L. A. Coldren, D. Bouwmeester, M. P. van Exter
    Opt. Lett. 40, 3173 (2015)
  10. Quantum dot nonlinearity through cavity-enhanced feedback with a charge memory
    M. P. Bakker, T. Ruytenberg, W. Löffler, A. V. Barve, L. Coldren, M. P. van Exter, D. Bouwmeester
    Phys. Rev. B 91, 241305(R) (2015), Arxiv:1503.08142
  11. Polarization degenerate solid-state cavity quantum electrodynamics
    M. P. Bakker, A. Barve, T. Ruytenberg, W. Löffler, L. A. Coldren, D. Bouwmeester, M. P. van Exter
    Phys. Rev. B 91, 115319 (2015), Arxiv:1503.08071
  12. The Role of Spatial Coherence and Orbital Angular Momentum of Light in Astronomy
    D. Hetharia, M. P. van Exter, W. Löffler
    Phys. Rev. A 90, 063801 (2014), Arxiv:1404.6404
  13. An experiment on the shifts of reflected C-lines
    W. Löffler, J. F. Nye, J. Hannay
    J. Opt. 16, 085703 (2014), Arxiv:1402.2917 (2014)
    on the cover of J. Opt., IOP featured article, see also IOP Labtalk article
  14. Eigenpolarizations for Giant Transverse Optical Beam Shifts
    J. B. Götte, W. Löffler, M. R. Dennis
    Phys. Rev. Lett. 112, 233901 (2014), Arxiv:1401.5505 (2014)
  15. Mutually Unbiased Bases and Bound Entanglement
    B. C. Hiesmayr and W. Löffler
    Phys. Scr. T160, 014017 (2014), Arxiv:1309.2271
  16. Walsh modes and radial quantum correlations of spatially entangled photons
    D. Geelen and W. Löffler
    Opt. Lett. 38, 4108 (2013)
  17. Complementarity Reveals Bound Entanglement of Two Twisted Photons
    B. C. Hiesmayr and W. Löffler
    New J. Phys. 15, 083036 (2013), Arxiv:1212.5046
  18. Beyond catoptrics
    J. Götte, M. Hentschel, and W. Löffler
    J. Opt. 15, 010301 (2013)
  19. Total internal reflection of orbital angular momentum beams
    W. Löffler, N. Hermosa, A. Aiello, and J.P. Woerdman
    J. Opt. 15, 014012 (2013), Arxiv:1208.4261
  20. Spatial Coherence and Optical Beam Shifts
    W. Löffler, A. Aiello, and J.P. Woerdman
    Phys. Rev. Lett. 109, 213901 (2012), on the cover of PRL, Arxiv:1207.4364
  21. Instability of higher-order optical vortices analyzed with a multi-pinhole interferometer
    F. Ricci, W. Löffler, M. P. van Exter
    Opt. Express 20, 22961 (2012)
  22. Observation of OAM sidebands due to optical reflection
    W. Löffler, A. Aiello, and J.P. Woerdman
    Phys. Rev. Lett. 109, 113602 (2012), Arxiv:1204.4003
  23. Full-Field Quantum Correlations of Spatially Entangled Photons
    V. D. Salakhutdinov, E. R. Eliel, and W. Löffler
    Phys. Rev. Lett. 108, 173604 (2012),Arxiv:1204.5758
  24. Fiber Transport of Spatially Entangled Photons
    W. Löffler, T. G. Euser, E. R. Eliel, M. Scharrer, P. St.J. Russell, and J.P. Woerdman
    Phys. Rev. Lett. 106, 240505 (2011)
    Featured in: Physorg.com June, 30 (2011) by Miranda Marquit
  25. Search for Hermite-Gauss mode rotation in cholesteric liquid crystals
    W. Löffler, M. P. van Exter, G. W. 't Hooft, G. Nienhuis, D.J. Broer, and J.P. Woerdman
    Opt. Express 19, 12978 (2011)
  26. Circular dichroism of cholesteric polymers and the orbital angular momentum of light
    W. Löffler, D.J. Broer, and J.P. Woerdman
    Phys. Rev. A 83, 065801 (2011)
  27. Polarization-dependent Goos–Hänchen shift at a graded dielectric interface
    W. Löffler, M.P. van Exter, G.W. 't Hooft, E.R. Eliel, K. Hermans, D.J. Broer and J.P. Woerdman
    Opt. Commun. 283, 3367 (2010)
  28. Doping and optimal electron spin polarization in n-ZnMnSe for quantum-dot spin-injection light-emitting diodes
    W. Löffler, N. Höpcke, H. Kalt, S. F. Li, M. Grün, and M. Hetterich
    Appl. Phys. Lett. 96, 052113 (2010)
  29. Far-field observation of the radial profile of visible whispering-gallery modes in a single microdisk based on Si-nanocrystal/SiO2 superlattices
    Se-Young Seo, Rong-Jun Zhang, Wolfgang Löffler, Heinz Kalt, Kyung Joong Kim, and Margit Zacharias
    J. Appl. Phys. 106, 123102 (2009)
  30. Spin-polarization dynamics in InGaAs quantum dots during pulsed electrical spin-injection
    P. Asshoff, W. Löffler, J. Zimmer, H. Füser, H. Flügge, H. Kalt, and M. Hetterich
    Appl. Phys. Lett. 95, 202105 (2009).
    Selected for the Nov. 30, 2009 issue of:
    Virtual Journal of Nanoscale Science & Technology
  31. Determination of critical thickness for defect formation of CdSe/ZnSe heterostructures by transmission electron microscopy and photoluminescence spectroscopy
    D. Litvinov, M. Schowalter, A. Rosenauer, B. Daniel, J. Fallert, W. Löffler, H. Kalt, M. Hetterich
    Phys. Stat. Sol. (a) 205, 2892 (2008).
  32. Electrical Spin Injection into Single InGaAs Quantum Dots
    M. Hetterich, W. Löffler, P. Aßhoff, T. Passow, D. Litvinov, D. Gerthsen, H. Kalt
    Advances in Solid State Physics 48, 103 (2009).
  33. Spin-polarized excitonic emission from single quantum dots after electrical injection
    W. Löffler, M. Hetterich, C. Mauser, S. Li, J. Leuthold, H. Kalt
    Phys. Stat. Sol. (b) 245, 1102 (2008).
  34. Parallel preparation of highly spin-polarized electrons in single InAs/GaAs quantum dots
    W. Löffler, M. Hetterich, C. Mauser, S. Li, T. Passow, H. Kalt
    Appl. Phys. Lett. 90, 232105 (2007).
    Selected for the June 2007 issue of:
    Virtual Journal of Quantum Information
    Selected for the June 18, 2007 issue of:
    Virtual Journal of Nanoscale Science & Technology
  35. Optical modes in pyramidal GaAs microcavities
    F.M. Weber, M. Karl, J. Lupaca-Schomber, W. Löffler, S. Li, T. Passow, J. Hawecker, D. Gerthsen, H. Kalt, M. Hetterich
    Appl. Phys. Lett. 90, 161104 (2007).
    Featured in:
    Nature Photonics 1, 317 (2007), News & Views.
    Selected for the April 30, 2007 issue of:
    Virtual Journal of Nanoscale Science & Technology.
  36. Localized and delocalized modes in coupled optical micropillar cavities
    M. Karl, S. Li, T. Passow, W. Löffler, H. Kalt, M. Hetterich
    Optics Express 15, 8191 (2007).
  37. Invited: Electrical spin injection into InGa(N)As quantum structures and single InGaAs quantum dots
    7th Int. Conf. on Excitonic Processes in Condensed Matter, Winston-Salem, NC, USA (EXCON 2006)
    M. Hetterich, W. Löffler, J. Fallert, N. Höpcke, H. Burger, T. Passow, S. Li, B. Daniel, B. Ramadout, J. Lupaca-Schomber, J. Hetterich, D. Litvinov, D. Gerthsen, C. Klingshirn, H. Kalt
    upgraded to regular paper
    Phys. Stat. Sol. (b) 243, 3812 (2006).
  38. Electrical spin injection from ZnMnSe into InGaAs quantum wells and quantum dots
    W. Löffler, D. Tröndle, J. Fallert, H. Kalt, D. Litvinov, D. Gerthsen, J. Lupaca-Schomber, T. Passow, B. Daniel, J. Kvietkova, M. Grün, C. Klingshirn, M. Hetterich
    Appl. Phys. Lett. 88, 062105 (2006).
    Selected for the February 20, 2006 issue of:
    Virtual Journal of Nanoscale Science & Technology
  39. Molecular beam epitaxy of phase pure cubic InN
    J. Schörmann, D.J. As, K. Lischka, P. Schley, R. Goldhahn, S. F. Li, W. Löffler, M. Hetterich, H. Kalt
    Appl. Phys. Lett. 89, 261903 (2006).

Invited colloquium talks

  1. QuTech Delft (September 2018)
    QuTech
  2. Paris, France (March 2018)
    CNRS-C2N Centre for Nanoscience and Nanotechnology
  3. Groningen, Netherlands (January 2017)
    Zernike Institute for Advanced Materials
  4. Konstanz, Germany (January 2017)
    University of Konstanz, Department of Physics
  5. Bath, UK (January 2016)
    University of Bath, Centre for Photonics and Photonic Materials
  6. Berlin, Germany (December 2015)
    HU Berlin, department of physics
  7. Eindhoven, Netherlands (August 2015)
    TU Eindhoven, Photonics and Semiconductor Nanophysics
  8. Delft, Netherlands (May 2015)
    TU Delft, Imaging Physics
  9. Santa Barbara, California (February 2015)
    UCSB, Condensed Matter Experimental Physics
  10. Delft, Netherlands (July 2014)
    TU Delft, Optics Research Group
  11. Erlangen, Germany (November 2013)
    Max Planck Institute for the Science of Light
  12. Twente, Netherlands (May 2013)
    Complex photonics systems
  13. Glasgow, UK. (June 2012)
    The School of Physics and Astronomy, Optics Group
  14. Karlsruhe, Germany (May 2012)
    Institute of Applied Physics
  15. Erlangen, Germany (May 2012)
    Max Planck Institute for the Science of Light
  16. Madrid, Spain (March 2012)
    Electromagnetism and Fundamental Physics group at Universidad Rey Juan Carlos
  17. Leiden, Netherlands (December 2011)
    Joan van der Waals Colloquium
  18. Bristol, UK (March 2010)
    Theoretical Physics institute
  19. Berlin, Germany (2006)
    Minisymposium Nano Optics 2006, Zuse Institute Berlin

  1. Solid-state cavity QED
    LION Summer School: Modern Physics at all Scales, Leiden University (2018)
  2. Semiconductor quantum photonics
    LION Summer School: Modern Physics at all Scales, Leiden University (2017)
  3. Quantum Optics and Cavity-QED
    W. Löffler
    Summer school on quantum information, University of Campinas (BR) (2016)
  4. Scattering of twisted light by helical matter
    W. Löffler
    Eureka magazine, Nummer 31, 6 (2011).

Conferences and meetings

  1. Invited, to appear: Single and entangled photons with quantum dot cavity-QED
    W. Löffler
    New Quantum Horizons 2018, Frascati, Rome, Italy
  2. Polarization and high-fidelity fiber-integrated quantum dot cavity-QED devices
    W. Löffler
    ICIQP 2018, Paris, France
  3. Invited: Unconventional photon blockade in polarized quantum dot cavity-QED for bright single photon sources
    W. Löffler
    SPIE Optics + Photonics 2018, San Diego, USA
  4. Polarization tuning for high-fidelity fiber-coupled single photon sources
    J. A. Frey, H. J. Snijders, J. Norman, A. C. Gossard, J. E. Bowers, W. Löffler, D. Bouwmeester
    SPIE Optics + Photonics 2018, San Diego, USA
  5. Invited: Quantum (de)coherence
    W. Löffler
    Physics@Veldhoven 2018, Veldhoven, Netherlands
  6. Invited: Quantum dot cavity-QED: single photon interference & chirality
    W. Löffler
    Max Planck workshop on Chiral Photonics 2017, Erlangen, Germany
  7. Invited: Polarization-controlled fiber coupled quantum dot cavity QED
    W. Löffler
    OSA Incubator meeting Integrated Semiconductor Quantum Photonic Devices (2017), Washington D.C., USA
  8. Invited: Building blocks for a future quantum internet
    W. Löffler
    Photonics NL 2017, Veldhoven, Netherlands
  9. Postdeadline: A Fiber Coupled Source of Identical Single Photons
    H. Snijders, J.A. Frey, J. Norman, V.P. Post, A. Gossard, J.E. Bowers, M. P. van Exter, D. Bouwmeester, and W. Löffler
    CLEO Europe 2017, Munich, Germany
  10. Invited: QuSpace - Quantum Optomechanics in space
    W. Löffler, Bob Dirks, Ernst-Jan Buis
    ESA New Science Ideas workshop in Trento, Italy (2017)
  11. Invited: Perfect darkness in exact solutions of Maxwell's equations
    W. Löffler
    Quantum Field Framework for Structured Light Interactions (2017), Banff, Canada
  12. Invited: Multi photon vortex correlations
    W. Löffler
    Photon16, Leeds, UK
  13. Purification of a single photon nonlinearity
    W. Löffler
    Photon16, Leeds, UK
  14. Purification of a single-photon nonlinearity of an intra-cavity quantum dot
    M. P. van Exter, H. Snijders, J. A. Frey, J. Norman, M. P. Bakker, E. C. Langman, A. Gossard, J. E. Bowers, D. Bouwmeester, W. Löffler
    SPSS 2016, Oxford, UK
  15. Purification of a single photon nonlinearity
    H. Snijders, J. A. Frey, J. Norman, M. P. Bakker, E. C. Langman, A. Gossard, J. E. Bowers, M. P. van Exter, D. Bouwmeester, W. Löffler
    CMD 26, Groningen, NL
  16. Invited: 4-photon OAM entanglement
    W. Löffler
    3rd International Conference on Orbital Angular Momentum (ICOAM) 2015, New York, USA
  17. Invited: Multi-photon quantum imaging, spatial coherence & entanglement
    W. Löffler
    COST workshop: Advances and future of foundations studied at different energies 2015, Vienna, Austria
  18. 4-Photon spatial-mode entanglement
    Quantum Information and Measurement 2014, Berlin, Germany, QW4A.4 (talk)
  19. Invited: 4-Photon spatial-mode entanglement
    W. Löffler
    Quantum Mechanics Tests in Particle, Atomic, Nuclear and Complex Systems 2014: 50 Years after Bell’s Renowned Theorem, ECT*, Trento, Italy (talk)
  20. Post-deadline talk: Four-Photon Transverse Mode Entanglement
    W. Löffler
    Frontiers in Optics 2013, Orlando, Florida, USA (talk)
  21. Invited: Fiber transport of spatially entangled photons
    W. Löffler
    Frontiers in Optics 2013, Orlando, Florida, USA (talk)
  22. Detection of bound entanglement of OAM photons using complementarity
    W. Löffler, B. C. Hiesmayr
    Frontiers in Optics 2013, Orlando, Florida, USA (talk)
  23. Keynote talk: Twisted photons
    W. Löffler
    Max Planck Institute Russell divisionworkshop 2013, Erlangen, Germany (talk)
  24. Invited: Complementarity Reveals Bound Entanglement of Two Twisted Photons
    B. C. Hiesmayr, W. Löffler
    CEWQO 2013, Stockholm, Sweden (talk)
  25. Invited: 'Twisted' photon entanglement
    W. Löffler
    ICOAM 2013, Glasgow, UK (talk)
  26. Invited: Complementarity reveals bound entanglement of two OAM photons
    W. Löffler
    Physics of Quantum Electronics 2013, Snowbird, Utah, USA (talk)
  27. Invited: Twisted and entangled photons & beyond
    W. Löffler
    ECT* workshop on Many-body Open Quantum Systems 2012: From Atomic Nuclei to Quantum Optics, Trento, Italy talk
  28. Keynote talk: Phase-only modulation of spatially entangled photons
    W. Löffler
    Quantum Africa 2 (2012), Durban, South Africa (talk)
  29. Invited: Hybrid Radial-Angular Quantum Correlations of Spatially Entangled Photons
    W. Löffler, V. D. Salakhutdinov, E. R. Eliel
    Quantum Information and Measurement 2012, Berlin, Germany, QW3A.6 (talk)
    Conference paper
  30. Invited: Fiber transport of spatially entangled photons
    W. Löffler, E. R. Eliel, J.P. Woerdman, T. G. Euser, M. Scharrer, P. St.J. Russell
    Photonics West 2012, San Francisco, USA, 8274-14 (talk)
    Proc. SPIE 8274, 82740F (2012)
  31. Cholesteric polymers and the orbital angular momentum of light
    W. Löffler, J.P. Woerdman
    Photonics West 2012, San Francisco, USA, 8274-03 (talk)
    Proc. SPIE 8274, 827404 (2012)
  32. Spatial photon entanglement and binary coding
    W. Löffler
    36th Annual Meeting NNV AMO Lunteren 2012.
  33. Invited: Transport of Spatially Entangled Qutrits Through a Photonic Crystal Fiber
    W. Löffler, E. R. Eliel, J.P. Woerdman, T. G. Euser, M. Scharrer, P. St.J. Russell
    International Conference on Quantum Information, (ICQI) 2011, Ottawa, Canada, QMD2 (talk)
    OSA Technical Digest
  34. Fiber Transport of Spatially Entangled Qutrits
    W. Löffler, E. R. Eliel, J.P. Woerdman, T. G. Euser, M. Scharrer, P. St.J. Russell
    CLEO/QELS 2011, Baltimore, Maryland, USA, JTuF3 (talk)
    OSA Technical Digest
  35. Transport of 3D spatially entangled photon qutrits through an optical fiber
    W. Löffler, T.G. Euser, M. Scharrer, P. St.-J Russell, E.R. Eliel, J.P. Woerdman
    Physics@FOM Veldhoven 2011 (talk).
  36. Transport of OAM-Based QuNits through Few-Mode Optical Fibers
    J.P. Woerdman, W. Löffler, E.R. Eliel, T.G. Euser, M. Scharrer, P St.-J Russell
    Frontiers in Optics 2010, Rochester, New York, USA (talk)
  37. Polarisation-dependent Goos-Hänchen shift at a graded dielectric interface
    W. Löffler, M.P. van Exter, G.W. 't Hooft, E.R. Eliel, K. Hermans, D.J. Broer, J.P. Woerdman
    Photon 10, Southampton, United Kingdom, 2010 (talk)
  38. Transport of OAM quNits through few-mode optical fibres
    W. Löffler, T.G. Euser, M. Scharrer, P. St.-J Russell, E.R. Eliel, J.P. Woerdman
    Photon 10, Southampton, United Kingdom, 2010
  39. Transport of 3D spatially entangled photons through a hollow-core photonic crystal fibre
    W. Löffler
    34th Annual Meeting NNV AMO Lunteren 2010 (talk).
  40. Pulsed Electrical Spin Injection into InGaAs Quantum Dots: Studies of the Electroluminescence Polarization Dynamics
    P. Asshoff, W. Löffler, H. Flügge, J. Zimmer, J. Müller, B. Westenfelder, D. Z. Hu, D. M. Schaadt, H. Kalt, and M. Hetterich
    Proc. 29th Int. Conf. on the Physics of Semiconductors (ICPS), Rio de Janeiro, Brazil, 2008
    AIP Conf. Proc. {bf 1199}, 383 (2010).
  41. Ferromagnet/Superconductor Hybrids with Perpendicular Magnetic Anisotropy
    C. Sürgers, N. Joshi, A. Singh, H. Kalt, W. Löffler, H. v. Löhneysen
    The International Conference on Magnetism (ICM), Karlsruhe, Germany, 2009
    Journal of Physics: Conference Series {bf 200}, 072096 (2010).
  42. Spin-Polarization Dynamics in Electrically Excited Single InGaAs Quantum Dots
    Pablo Asshoff, Jochen Zimmer, Heiko Füser, Wolfgang Löffler, Michael Hetterich, Heinz Kalt
    The International Conference on Magnetism (ICM), Karlsruhe, Germany, 2009
    Journal of Physics: Conference Series {bf 200}, 062002 (2010).
  43. Electrical Spin Injection into InGaAs Quantum Dots: Single Dot Devices and Studies of the Time-Resolved Electroluminescence Polarization Dynamics
    M. Hetterich, W. Löffler, P. Aßhoff, H. Flügge, J. Müller, B. Westenfelder, D. Z. Hu, D. M. Schaadt, H. Kalt
    29th International Conference on the Physics of Semiconductors (ICPS), Rio de Janeiro, Brazil, 2008
    AIP Conf. Proc. {bf 1199}, 383 (2010).
  44. Ferromagnet / Superconductor Heterostructures with Perpendicular Magnetic Anisotropy
    N. Joshi, C. Sürgers, A. Singh, W. Löffler, H. Kalt, and H. v. Löhneysen
    International Conference on Superconductivity and Magnetism (ICSM), Antalya, Turkey, 2008
  45. Electrical spin injection into InGaAs quantum dots: single dot devices and time-resolved studies
    M. Hetterich, W. Löffler, P. Aßhoff, H. Flügge, J. Müller, B. Westenfelder, D. Z. Hu, D. M. Schaadt, H. Kalt
    9th Int. Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 9), Rostock, Germany, 2008 Phys. Stat. Sol. (c) {bf 2}, 432 (2009).
  46. Spin-polarized excitonic emission from single quantum dots after electrical injection
    W. Löffler, M. Hetterich, C. Mauser, S. Li, J. Leuthold, H. Kalt
    10th Conference on the Optics of Excitons in Confined Systems (OECS 10), Patti, Messina, Italy, 2007 (talk)
    upgraded to regular paper
    Phys. Stat. Sol. (b) {bf 245}, 1102 (2008).
  47. GaAs pyramids on GaAs/AlAs DBRs as alternative microcavities
    M. Karl, F.M. Weber, J. Lupaca-Schomber, S. Li, T. Passow, W. Löffler, H. Kalt, M. Hetterich
    7th Int. Conf. on the Physics of Light-Matter Coupling in Nanostructures (PLMCN7), Havana, Cuba, 2007 (talk)
    Superlattices and Microstructures {bf 43}, 635-638 (2008).
  48. Optical modes in coupled pillar microcavities
    M. Karl, S. Li, T. Passow, W. Löffler, E. Müller, D. Gerthsen, H. Kalt, M. Hetterich
    Proc. European Conference on Lasers and Electro-Optics (CLEO Europe), Munich,
    Germany, 2007 (talk)
    Paper CK-238.pdf (CK-2-MON).
  49. Parallel electrical spin preparation in InGaAs/GaAs quantum dots with high fidelity
    W. Löffler, C. Mauser, N. Höpcke, H. Kalt, S. Li, T. Passow, H. Reimer,
    M. Hetterich
    Proc. European Conference on Lasers and Electro-Optics (CLEO Europe), Munich,
    Germany, 2007 (talk)
    Paper IC-1605.pdf (IF3-4-THU 9:30).
  50. Electrical spin injection into InGaAs quantum dots
    W. Löffler, D. Tröndle, J. Fallert, E. Tsitsishvili, H. Kalt, D. Litvinov, D. Gerthsen, J. Lupaca-Schomber, T. Passow, B. Daniel, J. Kvietkova, M. Hetterich
    8th Int. Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 8), Münster, Germany, 2006 (talk)
    Phys. Stat. Sol. (c) {bf 3}, 2406 (2006).
  51. Spin and carrier relaxation dynamics in InAs/GaAs quantum-dot spin-LEDs
    W. Löffler, N. Höpcke, C. Mauser, J. Fallert, T. Passow, B. Daniel, S. Li, D. Litvinov, D. Gerthsen, H. Kalt, M. Hetterich
    International Conference on Nanoscience and Technology (ICN+T) 2006, Basel, Switzerland (talk)
    Journal of Physics: Conference Series {bf 61}, 745 (2007).
  52. Investigation of InAs quantum dot growth for electrical spin injection devices
    T. Passow, S. Li, D. Litvinov, W. Löffler, J. Fallert, B. Daniel, J. Lupaca-Schomber, J. Kvietková, D. Gerthsen, H. Kalt, M. Hetterich
    4th Int. Conf. on Quantum Dots (QD2006), Chamonix-Mont Blanc, France
    Phys. Stat. Sol. (c) {bf 3}, 3943 (2006).
  53. Electrical spin injection into InGaAs quantum dot ensembles and single quantum dots
    M. Hetterich, W. Löffler, J. Fallert, T. Passow, B. Daniel, J. Lupaca-Schomber, J. Hetterich, S. Li, C. Klingshirn, H. Kalt
    Proc. 28th Int. Conf. on the Physics of Semiconductors, Vienna, Austria, 2006 (talk)
    AIP Conf. Proc. {bf 893}, 1285 (2007).
  54. Single and coupled microcavities – AlAs/GaAs DBR pillars and GaAs pyramids
    M. Karl, W. Löffler, J. Lupaca-Schomber, T. Passow, S. Li, J. Hawecker, F. Pérez-Willard, D. Gerthsen, H. Kalt, C. Klingshirn, M. Hetterich
    Proc. 28th Int. Conf. on the Physics of Semiconductors, Vienna, Austria, 2006
    AIP Conf. Proc. {bf 893}, 1133 (2007).
  55. Molecular Beam Epitaxy of phase-pure cubic InN
    J. Schörmann, D.J. As, K. Lischka, P. Schley, R. Goldhahn, S. F. Li, W. Löffler, M. Hetterich, H. Kalt
    14th European Molecular Beam Epitaxy Workshop (Euro-MBE 2007), Sierra Nevada, Granada, Spain, 2007
    Talk MoA1.
  56. Electrical spin injection from ZnMnSe into InGaAs-based quantum structures
    W. Löffler, D. Tröndle, H. Kalt, D. Litvinov, D. Gerthsen, J. Lupaca-Schomber, T. Passow, B. Daniel, J. Kvietkova, M. Hetterich
    Proc. 12th Int. Conf. on Modulated Semiconductor Structures (MSS-12), Albuquerque, USA, 2005
    Physica E {bf 32}, 434 (2006).
  57. Optical spin injection from a ZnMnSe spin aligner into GaAs / AlGaAs quantum wells
    D. Tröndle, W. Löffler, Th. Passow, B. Daniel, M. Grün, M. Hetterich, C. Klingshirn, H. Kalt
    in: Proc. Conference on Lasers and Electro-Optics (CLEO) / Quantum Electronics and Laser Science (QELS) 2005, paper JTuC96, pp. 1064–1066, Optical Society of America, Washington DC (2005).
  58. Bestimmung des effektiven Mn-Gehalts und der Lande-Faktoren von semimagnetischen ZnMnSe Schichten
    D. Tröndle, W. Löffler, Th. Passow, M. Grün, B. Daniel, M. Hetterich, C. Klingshirn, H. Kalt
    Nanofair 2004, Karlsruhe, VDI-Berichte 1839, 129 (2004).