@article{3435,
  abstract     = {{Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative
to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used.
With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons
can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is
inherently insensitive to the exciton fine-structure splitting. In the present work we analyze the biexciton emission
with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment.
Especially for a high-quality cavity, the coupling to the surrounding semiconductormaterial can open up additional
phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy,
the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed—high
degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted
twin photons.}},
  author       = {{Heinze, Dirk and Zrenner, Artur and Schumacher, Stefan}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{24}},
  title        = {{{Polarization-entangled twin photons from two-photon quantum-dot emission}}},
  doi          = {{10.1103/PhysRevB.95.245306}},
  year         = {{2017}},
}

@article{4409,
  abstract     = {{We investigate the interplay between geometrical lattice resonances and surface plasmons mediating the
emission of Smith-Purcell visible light via angle-resolved cathodoluminescence spectroscopy. We observe
strong modulations in the dispersion curves of Smith-Purcell radiation (SPR) when they intersect the surface
plasmons of silver gratings using a 200-kV transmission electron microscope. The decay of the plasmons away
from the grating is directly probed by controlling the electron-beam position relative to the sample surface
with nanometer precision. Our measurements are in excellent agreement with numerical simulations, clearly
revealing the presence of characteristic Fano profiles resulting from the interference of the light continuum
and the discrete plasmon states for each direction of emission. The intensity anomaly in the SPR emission
pattern can be well explained from the geometrical consideration of the intersections between the dispersion
planes of the SPR and surface plasmon polariton (SPP). A strong and directional SPR beam can be realized
under the condition that the SPR dispersion plane comes in contact with the band edge of the SPP dispersion
plane.}},
  author       = {{Yamamoto, Naoki and Javier García de Abajo, F. and Myroshnychenko, Viktor}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{12}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy}}},
  doi          = {{10.1103/physrevb.91.125144}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{7218,
  author       = {{Debus, J. and Kudlacik, D. and Sapega, V. F. and Dunker, D. and Bohn, P. and Paßmann, F. and Braukmann, D. and Rautert, J. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{19}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Nuclear spin polarization in the electron spin-flip Raman scattering of singly charged (In,Ga)As/GaAs quantum dots}}},
  doi          = {{10.1103/physrevb.92.195421}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{7222,
  author       = {{Finke, A. and Ruth, M. and Scholz, S. and Ludwig, A. and Wieck, A. D. and Reuter, Dirk and Pawlis, A.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{3}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Extending the spectral range of CdSe/ZnSe quantum wells by strain engineering}}},
  doi          = {{10.1103/physrevb.91.035409}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{6522,
  abstract     = {{An electric field applied to a semiconductor reduces its crystal symmetry and modifies its electronic structure which is expected to result in changes of the linear and nonlinear response to optical excitation. In GaAs, we observe experimentally strong electric field effects on the optical second (SHG) and third (THG) harmonic generation. The SHG signal for the laser-light k vector parallel to the [001] crystal axis is symmetry forbidden in the electric-dipole approximation, but can be induced by an applied electric field in the vicinity of the 1s exciton energy. Surprisingly, the THG signal, which is allowed in this geometry, is considerably reduced by the electric field. We develop a theory which provides good agreement with the experimental data. In particular, it shows that the optical nonlinearities for the 1s exciton resonance are modified in an electric field by the Stark effect, which mixes the 1s and 2p exciton states of opposite parity. This mixing acts in opposite way on the SHG and THG processes, as it leads to the appearance of forbidden SHG in (001)-oriented GaAs and decreases the crystallographic THG.}},
  author       = {{Brunne, D. and Lafrentz, M. and Pavlov, V. V. and Pisarev, R. V. and Rodina, A. V. and Yakovlev, D. R. and Bayer, M.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Electric field effect on optical harmonic generation at the exciton resonances in GaAs}}},
  doi          = {{10.1103/physrevb.92.085202}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{10027,
  author       = {{Landmann, M. and Rauls, E. and Schmidt, Wolf Gero and Neumann, M. D. and Speiser, E. and Esser, N.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  title        = {{{GaNm-plane: Atomic structure, surface bands, and optical response}}},
  doi          = {{10.1103/physrevb.91.035302}},
  year         = {{2015}},
}

@article{10031,
  author       = {{Li, Yanlu and Schmidt, Wolf Gero and Sanna, Simone}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  title        = {{{Defect complexes in congruentLiNbO3and their optical signatures}}},
  doi          = {{10.1103/physrevb.91.174106}},
  year         = {{2015}},
}

@article{31943,
  author       = {{Ma, Xuekai and Chestnov, I. Yu. and Charukhchyan, M. V. and Alodjants, A. P. and Egorov, O. A.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  keywords     = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}},
  number       = {{21}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Oscillatory dynamics of nonequilibrium dissipative exciton-polariton condensates in weak-contrast lattices}}},
  doi          = {{10.1103/physrevb.91.214301}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{31944,
  author       = {{Liew, T. C. H. and Egorov, O. A. and Matuszewski, M. and Kyriienko, O. and Ma, Xuekai and Ostrovskaya, E. A.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  keywords     = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}},
  number       = {{8}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Instability-induced formation and nonequilibrium dynamics of phase defects in polariton condensates}}},
  doi          = {{10.1103/physrevb.91.085413}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{4332,
  abstract     = {{LiTaO3 and LiNbO3 crystals are investigated here in a combined experimental and theoretical study that uses Raman spectroscopy in a complete set of scattering geometries and corresponding density-functional theory calculations to provide microscopic information on their vibrational properties. The Raman scattering efficiency is computed from first principles in order to univocally assign the measured Raman peaks to the calculated eigenvectors. Measured and calculated Raman spectra are shown to be in qualitative agreement and confirm the mode assignment by Margueron et al. [J. Appl. Phys. 111, 104105 (2012)], thus finally settling a long debate. While the two crystals show rather similar vibrational properties overall, the E-TO9 mode is markedly different in the two oxides. The deviations are explained by a different anion-cation bond type in LiTaO3 and LiNbO3 crystals.}},
  author       = {{Sanna, Simone and Neufeld, Sergej and Rüsing, Michael and Berth, Gerhard and Zrenner, Artur and Schmidt, Wolf Gero}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{22}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Raman scattering efficiency in LiTaO3 and LiNbO3 crystals}}},
  doi          = {{10.1103/physrevb.91.224302}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{59691,
  abstract     = {{Injecting spin-polarized carriers into semiconductor lasers provides important opportunities to extend what is known about spintronic devices, as well as to overcome many limitations of conventional (spin-unpolarized) lasers. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we study how its operation properties can be modified by spin-polarized carriers, carrier density, and resonant cavity design. We reveal that by applying a uniaxial strain, it is possible to attain a large birefringence. While such birefringence is viewed as detrimental in conventional lasers, it could enable fast polarization oscillations of the emitted light in spin lasers, which can be exploited for optical communication and high-performance interconnects. The resulting oscillation frequency (>200 GHz) would significantly exceed the frequency range possible in conventional lasers.}},
  author       = {{Faria Junior, Paulo E. and Xu, Gaofeng and Lee, Jeongsu and Gerhardt, Nils Christopher and Sipahi, Guilherme M. and Žutić, Igor}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Toward high-frequency operation of spin lasers}}},
  doi          = {{10.1103/physrevb.92.075311}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{59693,
  abstract     = {{Injecting spin-polarized carriers into semiconductor lasers provides important opportunities to extend what is known about spintronic devices, as well as to overcome many limitations of conventional (spin-unpolarized) lasers. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we study how its operation properties can be modified by spin-polarized carriers, carrier density, and resonant cavity design. We reveal that by applying a uniaxial strain, it is possible to attain a large birefringence. While such birefringence is viewed as detrimental in conventional lasers, it could enable fast polarization oscillations of the emitted light in spin lasers, which can be exploited for optical communication and high-performance interconnects. The resulting oscillation frequency (>200 GHz) would significantly exceed the frequency range possible in conventional lasers.}},
  author       = {{Faria Junior, Paulo E. and Xu, Gaofeng and Lee, Jeongsu and Gerhardt, Nils Christopher and Sipahi, Guilherme M. and Žutić, Igor}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Toward high-frequency operation of spin lasers}}},
  doi          = {{10.1103/physrevb.92.075311}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{13493,
  author       = {{Müllegger, Stefan and Rauls, Eva and Gerstmann, Uwe and Tebi, Stefano and Serrano, Giulia and Wiespointner-Baumgarthuber, Stefan and Schmidt, Wolf Gero and Koch, Reinhold}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{22}},
  title        = {{{Mechanism for nuclear and electron spin excitation by radio frequency current}}},
  doi          = {{10.1103/physrevb.92.220418}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{13496,
  author       = {{Edler, F. and Miccoli, I. and Demuth, S. and Pfnür, H. and Wippermann, S. and Lücke, A. and Schmidt, Wolf Gero and Tegenkamp, C.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  title        = {{{Interwire coupling forIn(4×1)/Si(111) probed by surface transport}}},
  doi          = {{10.1103/physrevb.92.085426}},
  volume       = {{92}},
  year         = {{2015}},
}

@article{13502,
  author       = {{Klein, C. and Vollmers, N. J. and Gerstmann, Uwe and Zahl, P. and Lükermann, D. and Jnawali, G. and Pfnür, H. and Tegenkamp, C. and Sutter, P. and Schmidt, Wolf Gero and Horn-von Hoegen, M.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{19}},
  title        = {{{Barrier-free subsurface incorporation of 3d metal atoms into Bi(111) films}}},
  doi          = {{10.1103/physrevb.91.195441}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{13506,
  author       = {{Sanson, A. and Zaltron, A. and Argiolas, N. and Sada, C. and Bazzan, M. and Schmidt, Wolf Gero and Sanna, S.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  title        = {{{Polaronic deformation at theFe2+/3+impurity site inFe:LiNbO3crystals}}},
  doi          = {{10.1103/physrevb.91.094109}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{13507,
  author       = {{Landmann, M. and Rauls, E. and Schmidt, Wolf Gero and Neumann, M. D. and Speiser, E. and Esser, N.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  title        = {{{GaNm-plane: Atomic structure, surface bands, and optical response}}},
  doi          = {{10.1103/physrevb.91.035302}},
  volume       = {{91}},
  year         = {{2015}},
}

@article{15859,
  author       = {{Schmutzler, Johannes and Lewandowski, Przemyslaw and Aßmann, Marc and Niemietz, Dominik and Schumacher, Stefan and Kamp, Martin and Schneider, Christian and Höfling, Sven and Bayer, Manfred}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  title        = {{{All-optical flow control of a polariton condensate using nonresonant excitation}}},
  doi          = {{10.1103/physrevb.91.195308}},
  year         = {{2015}},
}

@article{7225,
  author       = {{Schüler, B. and Cerchez, M. and Xu, Hengyi and Schluck, J. and Heinzel, T. and Reuter, Dirk and Wieck, A. D.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{20}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Observation of quantum states without a semiclassical equivalence bound by a magnetic field gradient}}},
  doi          = {{10.1103/physrevb.90.201111}},
  volume       = {{90}},
  year         = {{2014}},
}

@article{7226,
  author       = {{Debus, J. and Sapega, V. F. and Dunker, D. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}},
  issn         = {{1098-0121}},
  journal      = {{Physical Review B}},
  number       = {{23}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Spin-flip Raman scattering of the resident electron in singly charged (In,Ga)As/GaAs quantum dot ensembles}}},
  doi          = {{10.1103/physrevb.90.235404}},
  volume       = {{90}},
  year         = {{2014}},
}