39 citations · 102 across the 11 of their papers we have counts for
11 papers
Self-consistent evaluation of the Berry connection for Wannier functions
Martin Thümmler, Thomas Lettau, Alexander Croy +2
The Berry connection is a gauge-dependent quantity frequently used to describe the optical response of solids. Its evaluation requires a k-derivative with respect to the cell perio…
Semiconductor Bloch equations in Wannier gauge with well-behaved dephasing
Martin Thümmler, Thomas Lettau, Alexander Croy +2
The semiconductor Bloch equations (SBEs) with a dephasing operator for the microscopic polarizations are a well established approach to simulate high-harmonic spectra in solids. We…
Ultrafast Coherent Bandgap Modulation Probed by Parametric Nonlinear Optics
Sebastian Klimmer, Thomas Lettau, Laura Valencia Molina +5
Light-matter interactions in crystals are powerful tools that seamlessly allow both functionalities of sizeable bandgap modulation and non-invasive spectroscopy. While we often ass…
Real-time simulations of laser-induced electron excitations in crystalline ZnO
Xiao Chen, Thomas Lettau, Ulf Peschel +2
We investigate non-equilibrium electron dynamics in crystalline ZnO induced by ultrashort, relatively intense, infrared laser pulses. Our focus is on understanding the mechanism th…
Unveiling the Role of Electron-Phonon Scattering in Dephasing High-Order Harmonics in Solids
Viacheslav Korolev, Thomas Lettau, Vipin Krishna +8
High-order harmonic generation (HHG) in solids is profoundly influenced by the dephasing of the coherent electron-hole motion driven by an external laser field. The exact physical…
Valley Polarization-Electric Dipole Interference and Nonlinear Chiral Selection Rules in Monolayer WSe
Paul Herrmann, Sebastian Klimmer, Till Weickhardt +6
In monolayer transition metal dichalcogenides time-reversal symmetry, combined with space-inversion symmetry, defines the spin-valley degree of freedom. As such, engineering and co…
Two-Particle Tight-Binding Description of Higher-Harmonic Generation in Semiconductor Nanostructures
Ulf Peschel, Thomas Lettau, Stefanie Gräfe +1
We develop a quantum mechanical theory to describe the optical response of semiconductor nanostructures with a particular emphasis on higher-order harmonic Generation. Based on a t…
Differences and similarities between lasing and multiple-photon subtracted states
T. Lettau, H. A. M. Leymann
We examine the effect that the subtraction of multiple photons has on the statistical characteristics of a light field. In particular, we are interested in the question whether an…
Superthermal photon bunching in terms of simple probability distributions
T. Lettau, H. A. M. Leymann, B. Melcher +1
We analyze the second-order photon autocorrelation function with respect to the photon probability distribution and discuss the generic features of a distribution that re…
Exploring the Photon-Number Distribution of Bimodal Microlasers
Elisabeth Schlottmann, Martin von Helversen, Heinrich A. M. Leymann +9
A photon-number resolving transition edge sensor (TES) is used to measure the photon-number distribution of two microcavity lasers. The investigated devices are bimodal microlasers…
Pitfalls in the theory of carrier dynamics in semiconductor quantum dots: the single-particle basis vs. the many-particle configuration basis
T. Lettau, H. A. M. Leymann, J. Wiersig
We analyze quantum dot models used in current research for misconceptions that arise from the choice of basis states for the carriers. The examined models originate from semiconduc…