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On the importance of electron-electron and electron-phonon scatterings and energy renormalizations during carrier relaxation in monolayer transition-metal dichalcogenides
J. Hader, J. Neuhaus, J. V. Moloney +1
An based fully microscopic many-body approach is used to study the carrier relaxation dynamics in monolayer transition-metal dichalcogenides. Bandstructures a…
Temperature-dependent spectral properties of (GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well heterostructure lasers
Christian Fuchs, Ada Baeumner, Anja Brueggemann +7
This paper discusses the temperature-dependent properties of (GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well heterostructures for laser applications based on theoretical modeling as well…
Mass Renormalization in Transition Metal Dichalcogenides
T. Stroucken, J. Neuhaus, S. W. Koch
It is shown that the three-fold rotational symmetry in transition metal dichalcogenides leads to a Coulomb induced renormalization of the effective electron and hole masses near th…
Spin-Layer- and Spin-Valley-Locking in CVD-Grown AA'- and AB-Stacked Tungsten-Disulfide Bilayers
Lorenz Maximilian Schneider, Jan Kuhnert, Simon Schmitt +10
Valley-selective optical selection rules and a spin-valley locking in transition-metal dichalcogenide (TMDC) monolayers are at the heart of "valleytronic physics", which exploits t…
Ultrafast band-gap renormalization and build-up of optical gain in monolayer MoTe
Lars Meckbach, Jörg Hader, Josefine Neuhaus +5
The dynamics of band-gap renormalization and gain build-up in monolayer MoTe is investigated by evaluating the non-equilibrium Dirac-Bloch equations with the incoherent carrier…
Superradiant coupling effects in transition-metal dichalcogenides
C. E. Stevens, T. Stroucken, A. V. Stier +6
Cooperative effects allow for fascinating characteristics in light-matter interacting systems. Here, we study naturally occurring superradiant coupling in a class of quasi-two-dime…
Influence of the effective layer thickness on the groundstate and excitonic properties of transition-metal dichalcogenide systems
Lars Meckbach, Tineke Stroucken, Stephan W. Koch
A self-consistent scheme for the calculations of the interacting groundstate and the near bandgap optical spectra of mono- and multilayer transition-metal-dichalcogenide systems is…
Density dependent exciton dynamics and L valley anisotropy in germanium
Markus Stein, Christian Lammers, Phillip Springer +4
Optical pump-THz probe spectroscopy is used to investigate the exciton formation dynamics and its intensity dependence in bulk Ge. Associated with the intra-excitonic 1s-2p transit…
Coherent cyclotron motion beyond Kohn's theorem
T. Maag, A. Bayer, S. Baierl +10
In solids, the high density of charged particles makes many-body interactions a pervasive principle governing optics and electronics[1-12]. However, Walter Kohn found in 1961 that…
Real-time observation of interfering crystal electrons in high-harmonic generation
M. Hohenleutner, F. Langer, O. Schubert +5
Accelerating and colliding particles has been a key strategy to explore the texture of matter. Strong lightwaves can control and recollide electronic wavepackets, generating high-h…
Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
O. Schubert, M. Hohenleutner, F. Langer +8
Ultrafast charge transport in strongly biased semiconductors is at the heart of highspeed electronics, electro-optics, and fundamental solid-state physics. Intense light pulses in…
Comment on "Nonlinear fluctuations and dissipation in matter revealed by quantum light"
M. Kira, S. W. Koch, S. T. Cundiff
In a recent paper [Phys.~Rev.~A {\bf 91}, 053844 (2015)], Mukamel and Dorfman compare spectroscopies performed with classical vs.~quantum light, and conclude that \textit{nonlinear…
Screening and gap generation in bilayer graphene
Tineke Stroucken, Johanna H. Grönqvist, Stephan. W. Koch
A fully selfconsistent treatment for gap generation and Coulomb screening in excitonic insulators is presented. The method is based on the equations of motion for the relevant dyna…
Observation of Coulomb-Assisted Dipole-Forbidden Intraexciton Transitions in Semiconductors
W. D. Rice, J. Kono, S. Zybell +14
We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monit…
Terahertz excitation of a coherent three-level Λ-type exciton-polariton microcavity mode
Joseph L. Tomaino, Andrew D. Jameson, Yun-Shik Lee +5
Interactions of few-cycle terahertz pulses with the induced optical polarization in a quantum-well microcavity reveal that the lower and higher exciton-polariton modes together wit…
Influence of bound and unbound electron-hole-pair populations on the excitonic luminescence in semiconductor quantum wells
W. Hoyer, M. Kira, S. W. Koch
A fully microscopic theory for the spontaneous emission from semiconductors is discussed. The theory is evaluated for a quantum-well system and the role of excitonic and unbound el…
Many-Body Dynamics and Exciton Formation Studied by Time-Resolved Photoluminescence
W. Hoyer, C. Ell, M. Kira +6
The dynamics of exciton and electron-hole plasma populations is studied via time-resolved photoluminescence after nonresonant excitation. By comparing the peak emission at the exci…