@inbook{18471, abstract = {{Collective spin excitations form a fundamental class of excitations in magnetic materials. As their energy reaches down to only a few meV, they are present at all temperatures and substantially influence the properties of magnetic systems. To study the spin excitations in solids from first principles, we have developed a computational scheme based on many-body perturbation theory within the full-potential linearized augmented plane-wave (FLAPW) method. The main quantity of interest is the dynamical transverse spin susceptibility or magnetic response function, from which magnetic excitations, including single-particle spin-flip Stoner excitations and collective spin-wave modes as well as their lifetimes, can be obtained. In order to describe spin waves we include appropriate vertex corrections in the form of a multiple-scattering T matrix, which describes the coupling of electrons and holes with different spins. The electron–hole interaction incorporates the screening of the many-body system within the random-phase approximation. To reduce the numerical cost in evaluating the four-point T matrix, we exploit a transformation to maximally localized Wannier functions that takes advantage of the short spatial range of electronic correlation in the partially filled d or f orbitals of magnetic materials. The theory and the implementation are discussed in detail. In particular, we show how the magnetic response function can be evaluated for arbitrary k points. This enables the calculation of smooth dispersion curves, allowing one to study fine details in the k dependence of the spin-wave spectra. We also demonstrate how spatial and time-reversal symmetry can be exploited to accelerate substantially the computation of the four-point quantities. As an illustration, we present spin-wave spectra and dispersions for the elementary ferromagnet bcc Fe, B2-type tetragonal FeCo, and CrO2 calculated with our scheme. The results are in good agreement with available experimental data.}}, author = {{Friedrich, Christoph and Şaşıoğlu, Ersoy and Müller, Mathias and Schindlmayr, Arno and Blügel, Stefan}}, booktitle = {{First Principles Approaches to Spectroscopic Properties of Complex Materials}}, editor = {{Di Valentin, Cristiana and Botti, Silvana and Cococcioni, Matteo}}, isbn = {{978-3-642-55067-6}}, issn = {{1436-5049}}, pages = {{259--301}}, publisher = {{Springer}}, title = {{{Spin excitations in solids from many-body perturbation theory}}}, doi = {{10.1007/128_2013_518}}, volume = {{347}}, year = {{2014}}, } @inbook{18472, abstract = {{Many-body perturbation theory is a well-established ab initio electronic-structure method based on Green functions. Although computationally more demanding than density functional theory, it has the distinct advantage that the exact expressions for all relevant observables, including the ground-state total energy, in terms of the Green function are known explicitly. The most important application, however, lies in the calculation of excited states, whose energies correspond directly to the poles of the Green function in the complex frequency plane. The accuracy of results obtained within this framework is only limited by the choice of the exchange-correlation self-energy, which must still be approximated in actual implementations. In this respect, the GW approximation has proved highly successful for systems governed by the Coulomb interaction. It yields band structures of solids, including the band gaps of semiconductors, as well as atomic and molecular ionization energies in very good quantitative agreement with experimental photoemission data.}}, author = {{Schindlmayr, Arno}}, booktitle = {{Many-Electron Approaches in Physics, Chemistry and Mathematics}}, editor = {{Bach, Volker and Delle Site, Luigi}}, isbn = {{978-3-319-06378-2}}, issn = {{2352-3905}}, pages = {{343--357}}, publisher = {{Springer}}, title = {{{The GW approximation for the electronic self-energy}}}, doi = {{10.1007/978-3-319-06379-9_19}}, volume = {{29}}, year = {{2014}}, } @article{18473, abstract = {{We investigate the band dispersion and related electronic properties of picene single crystals within the GW approximation for the electronic self-energy. The width of the upper highest occupied molecular orbital (HOMOu) band along the Γ–Y direction, corresponding to the b crystal axis in real space along which the molecules are stacked, is determined to be 0.60 eV and thus 0.11 eV larger than the value obtained from density-functional theory. As in our recent study of rubrene using the same methodology [S. Yanagisawa, Y. Morikawa, and A. Schindlmayr, Phys. Rev. B 88, 115438 (2013)], this increase in the bandwidth is due to the strong variation of the GW self-energy correction across the Brillouin zone, which in turn reflects the increasing hybridization of the HOMOu states of neighboring picene molecules from Γ to Y. In contrast, the width of the lower HOMO (HOMOl) band along Γ–Y remains almost unchanged, consistent with the fact that the HOMOl(Γ) and HOMOl(Y) states exhibit the same degree of hybridization, so that the nodal structure of the wave functions and the matrix elements of the self-energy correction are very similar.}}, author = {{Yanagisawa, Susumu and Morikawa, Yoshitada and Schindlmayr, Arno}}, issn = {{1347-4065}}, journal = {{Japanese Journal of Applied Physics}}, number = {{5S1}}, publisher = {{IOP Publishing and The Japan Society of Applied Physics}}, title = {{{Theoretical investigation of the band structure of picene single crystals within the GW approximation}}}, doi = {{10.7567/jjap.53.05fy02}}, volume = {{53}}, year = {{2014}}, } @inbook{18474, author = {{Friedrich, Christoph and Schindlmayr, Arno}}, booktitle = {{Computing Solids: Models, ab initio Methods and Supercomputing}}, editor = {{Blügel, Stefan and Helbig, Nicole and Meden, Volker and Wortmann, Daniel}}, isbn = {{978-3-89336-912-6}}, issn = {{1866-1807}}, location = {{Jülich}}, pages = {{A4.1--A4.21}}, publisher = {{Forschungszentrum Jülich}}, title = {{{Many-body perturbation theory: The GW approximation}}}, volume = {{74}}, year = {{2014}}, } @article{40400, author = {{Pérez, A. M. and Iskhakov, T. Sh. and Sharapova, Polina and Lemieux, S. and Tikhonova, O. V. and Chekhova, M. V. and Leuchs, G.}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{8}}, publisher = {{The Optical Society}}, title = {{{Bright squeezed-vacuum source with 11 spatial mode}}}, doi = {{10.1364/ol.39.002403}}, volume = {{39}}, year = {{2014}}, } @article{43198, abstract = {{Ultrafast charge transport in strongly biased semiconductors is at the heart of high-speed electronics, electro-optics and fundamental solid-state physics1,2,3,4,5,6,7,8,9,10,11,12,13. Intense light pulses in the terahertz spectral range have opened fascinating vistas14,15,16,17,18,19,20,21. Because terahertz photon energies are far below typical electronic interband resonances, a stable electromagnetic waveform may serve as a precisely adjustable bias5,11,17,19. Novel quantum phenomena have been anticipated for terahertz amplitudes, reaching atomic field strengths8,9,10. We exploit controlled (multi-)terahertz waveforms with peak fields of 72 MV cm−1 to drive coherent interband polarization combined with dynamical Bloch oscillations in semiconducting gallium selenide. These dynamics entail the emission of phase-stable high-harmonic transients, covering the entire terahertz-to-visible spectral domain between 0.1 and 675 THz. Quantum interference of different ionization paths of accelerated charge carriers is controlled via the waveform of the driving field and explained by a quantum theory of inter- and intraband dynamics. Our results pave the way towards all-coherent terahertz-rate electronics.}}, author = {{Meier, Torsten and Schubert, O. and Hohenleutner, M. and Langer, F. and Urbanek, B. and Lange, C. and Huttner, U. and Golde, D. and Kira, M. and Koch, S. W. and Huber, R.}}, journal = {{Nature Photonics}}, number = {{2}}, publisher = {{Nature Publishing Group}}, title = {{{Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations}}}, doi = {{10.1038/nphoton.2013.349}}, volume = {{8}}, year = {{2014}}, } @article{43251, abstract = {{The nonadiabatic dynamics of a many-body system driven through a quantum critical point can be controlled using counterdiabatic driving, where the formation of excitations is suppressed by assisting the dynamics with auxiliary multiple-body nonlocal interactions. We propose an alternative scheme which circumvents practical challenges to realize shortcuts to adiabaticity in mesoscopic systems by tailoring the functional form of the auxiliary counterdiabatic interactions. A driving scheme resorting in short-range few-body interactions is shown to generate an effectively adiabatic dynamics.}}, author = {{Saberi, H. and Opatrný, T. and Mølmer, K. and del Campo,, A.}}, journal = {{Physical Review A}}, number = {{6}}, title = {{{Adiabatic tracking of quantum many-body dynamics}}}, doi = {{10.1103/PhysRevA.90.060301}}, volume = {{90}}, year = {{2014}}, } @article{7236, author = {{Lo, Fang-Yuh and Guo, Jhong-Yu and Huang, Cheng-De and Chou, Kai-Chieh and Liu, Hsiang-Lin and Ney, Verena and Ney, Andreas and Chern, Ming-Yau and Shvarkov, Stepan and Reuter, Dirk and Wieck, Andreas D. and Pezzagna, Sébastien and Massies, Jean}}, issn = {{1567-1739}}, journal = {{Current Applied Physics}}, pages = {{S7--S11}}, publisher = {{Elsevier BV}}, title = {{{Evidences of defect contribution in magnetically ordered Sm-implanted GaN}}}, doi = {{10.1016/j.cap.2013.11.051}}, volume = {{14}}, year = {{2013}}, } @article{7239, author = {{Steinhoff, A. and Kurtze, H. and Gartner, P. and Florian, M. and Reuter, Dirk and Wieck, A. D. and Bayer, M. and Jahnke, F.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{20}}, publisher = {{American Physical Society (APS)}}, title = {{{Combined influence of Coulomb interaction and polarons on the carrier dynamics in InGaAs quantum dots}}}, doi = {{10.1103/physrevb.88.205309}}, volume = {{88}}, year = {{2013}}, } @article{7240, author = {{Henn, T. and Kiessling, T. and Ossau, W. and Molenkamp, L. W. and Reuter, Dirk and Wieck, A. D.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{19}}, publisher = {{American Physical Society (APS)}}, title = {{{Picosecond real-space imaging of electron spin diffusion in GaAs}}}, doi = {{10.1103/physrevb.88.195202}}, volume = {{88}}, year = {{2013}}, } @article{7258, author = {{Henn, T. and Heckel, A. and Beck, M. and Kiessling, T. and Ossau, W. and Molenkamp, L. W. and Reuter, Dirk and Wieck, A. D.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{8}}, publisher = {{American Physical Society (APS)}}, title = {{{Hot carrier effects on the magneto-optical detection of electron spins in GaAs}}}, doi = {{10.1103/physrevb.88.085303}}, volume = {{88}}, year = {{2013}}, } @article{7259, author = {{Buß, J. H. and Rudolph, J. and Shvarkov, S. and Semond, F. and Reuter, Dirk and Wieck, A. D. and Hägele, D.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{9}}, publisher = {{AIP Publishing}}, title = {{{Magneto-optical studies of Gd-implanted GaN: No spin alignment of conduction band electrons}}}, doi = {{10.1063/1.4819767}}, volume = {{103}}, year = {{2013}}, } @article{7260, author = {{Carrad, D J and Burke, A M and Reece, P J and Lyttleton, R W and Waddington, D E J and Rai, A and Reuter, Dirk and Wieck, A D and Micolich, A P}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{32}}, publisher = {{IOP Publishing}}, title = {{{The effect of (NH4)2Sxpassivation on the (311)A GaAs surface and its use in AlGaAs/GaAs heterostructure devices}}}, doi = {{10.1088/0953-8984/25/32/325304}}, volume = {{25}}, year = {{2013}}, } @article{7261, author = {{Höpfner, Henning and Fritsche, Carola and Ludwig, Arne and Ludwig, Astrid and Stromberg, Frank and Wende, Heiko and Keune, Werner and Reuter, Dirk and Wieck, Andreas D. and Gerhardt, Nils C. and Hofmann, Martin R.}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{9}}, pages = {{1214--1217}}, publisher = {{Wiley}}, title = {{{Spin relaxation length in quantum dot spin LEDs}}}, doi = {{10.1002/pssc.201200689}}, volume = {{10}}, year = {{2013}}, } @article{7262, author = {{Prechtel, Jonathan H. and Kuhlmann, Andreas V. and Houel, Julien and Greuter, Lukas and Ludwig, Arne and Reuter, Dirk and Wieck, Andreas D. and Warburton, Richard J.}}, issn = {{2160-3308}}, journal = {{Physical Review X}}, number = {{4}}, publisher = {{American Physical Society (APS)}}, title = {{{Frequency-Stabilized Source of Single Photons from a Solid-State Qubit}}}, doi = {{10.1103/physrevx.3.041006}}, volume = {{3}}, year = {{2013}}, } @article{7263, author = {{Moody, Galan and Singh, Rohan and Li, Hebin and Akimov, Ilya A. and Bayer, Manfred and Reuter, Dirk and Wieck, Andreas D. and Bracker, Allan S. and Gammon, Daniel and Cundiff, Steven T.}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, number = {{9}}, pages = {{1753--1759}}, publisher = {{Wiley}}, title = {{{Biexcitons in semiconductor quantum dot ensembles}}}, doi = {{10.1002/pssb.201200725}}, volume = {{250}}, year = {{2013}}, } @article{7264, author = {{Wortmann, Martin and Ludwig, Arne and Meijer, Jan and Reuter, Dirk and Wieck, Andreas D.}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, number = {{9}}, publisher = {{AIP Publishing}}, title = {{{High-resolution mass spectrometer for liquid metal ion sources}}}, doi = {{10.1063/1.4822275}}, volume = {{84}}, year = {{2013}}, } @article{7266, author = {{Kuhlmann, Andreas V. and Houel, Julien and Ludwig, Arne and Greuter, Lukas and Reuter, Dirk and Wieck, Andreas D. and Poggio, Martino and Warburton, Richard J.}}, issn = {{1745-2473}}, journal = {{Nature Physics}}, number = {{9}}, pages = {{570--575}}, publisher = {{Springer Nature}}, title = {{{Charge noise and spin noise in a semiconductor quantum device}}}, doi = {{10.1038/nphys2688}}, volume = {{9}}, year = {{2013}}, } @article{7267, author = {{Kuhlmann, Andreas V. and Houel, Julien and Brunner, Daniel and Ludwig, Arne and Reuter, Dirk and Wieck, Andreas D. and Warburton, Richard J.}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, number = {{7}}, publisher = {{AIP Publishing}}, title = {{{A dark-field microscope for background-free detection of resonance fluorescence from single semiconductor quantum dots operating in a set-and-forget mode}}}, doi = {{10.1063/1.4813879}}, volume = {{84}}, year = {{2013}}, } @inproceedings{7280, author = {{Höpfner, Henning and Fritsche, Carola and Ludwig, Arne and Ludwig, Astrid and Stromberg, Frank and Wende, Heiko and Keune, Werner and Reuter, Dirk and Wieck, Andreas D. and Gerhardt, Nils C. and Hofmann, Martin R.}}, booktitle = {{Spintronics VI}}, editor = {{Drouhin, Henri-Jean and Wegrowe, Jean-Eric and Razeghi, Manijeh}}, publisher = {{SPIE}}, title = {{{Spin injection, transport, and relaxation in spin light-emitting diodes: magnetic field effects}}}, doi = {{10.1117/12.2023324}}, year = {{2013}}, }