Electrical preparation of spin-polarized electrons in semiconductor quantum dots
W. Löffler, Doctoral Thesis, University of Karlsruhe (2008). (pdf link)
Pre-prints
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
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
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
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
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
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)
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
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)
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
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
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)
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)
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)
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)
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)
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)
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
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).
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).
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).
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
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.
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).
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).
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
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, to appear: Single and entangled
photons with quantum dot cavity-QED
W. Löffler New Quantum Horizons 2018,
Frascati, Rome, Italy
Polarization and high-fidelity fiber-integrated quantum dot
cavity-QED devices
W. Löffler ICIQP 2018, Paris, France
Invited: Unconventional photon blockade in
polarized quantum dot cavity-QED for bright single photon sources
W. Löffler SPIE Optics + Photonics 2018,
San Diego, USA
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
Invited: Building blocks for a future quantum
internet
W. Löffler Photonics NL 2017,
Veldhoven, Netherlands
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
Invited: QuSpace - Quantum Optomechanics in
space
W. Löffler, Bob Dirks, Ernst-Jan Buis ESA New Science Ideas
workshop in Trento, Italy (2017)
Invited: Multi photon vortex correlations
W. Löffler Photon16, Leeds, UK
Purification of a single photon nonlinearity
W. Löffler Photon16, Leeds, UK
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
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
Keynote talk: Phase-only modulation of spatially
entangled photons
W. Löffler Quantum Africa 2 (2012),
Durban, South Africa (talk)
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
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)
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)
Spatial photon entanglement and binary coding
W. Löffler
36th Annual Meeting NNV AMO Lunteren 2012.
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
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
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).
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)
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)
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
Transport of 3D spatially entangled photons through a hollow-core
photonic crystal fibre
W. Löffler
34th Annual Meeting NNV AMO Lunteren 2010 (talk).
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).
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).
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).
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).
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
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).
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).
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).
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).
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).
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).
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).
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).
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).
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).
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.
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).
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).
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).