Publications (18)
Parity symmetry as the origin of 'spin' in the quantum spin Hall effect
Wouter Beugeling
The quantum spin Hall effect arises due to band inversion in topological insulators, and has the defining characteristic that it hosts helical edge channels at zero magnetic field,…
Influence of the nuclear Zeeman effect on mode locking in pulsed semiconductor quantum dots
Wouter Beugeling, Götz S. Uhrig, Frithjof B. Anders
The coherence of the electron spin in a semiconductor quantum dot is strongly enhanced by mode locking through nuclear focusing, where the synchronization of the electron spin to p…
Spectral asymmetry induces a re-entrant quantum Hall effect in a topological insulator
Li-Xian Wang, Wouter Beugeling, Fabian Schmitt +5
The band inversion of topological materials in three spatial dimensions is intimately connected to the parity anomaly of two-dimensional massless Dirac fermions. At finite magnetic…
Nonlinear planar magnetotransport due to tilted Dirac cones in topological materials
Arya Thenapparambil, Graciely Elias dos Santos, Chang-An Li +7
Nonlinear planar magnetotransport is ubiquitous in topological HgTe structures, both in tensile (topological insulator) or compressively strained layers (Weyl semimetal phase). We…
Massive and topological surface states in tensile strained HgTe
David M. Mahler, Valentin L. Müller, Cornelius Thienel +4
Magneto-transport measurements on gated high mobility heterostructures containing a 60 nm layer of tensile strained HgTe, a three-dimensional topological insulator, show well-devel…
kdotpy: theory on a lattice for simulating semiconductor band structures
Wouter Beugeling, Florian Bayer, Christian Berger +11
The software project kdotpy provides a Python application for simulating electronic band structures of semiconductor devices with theory on a lattice. T…
Quantum model for mode locking in pulsed semiconductor quantum dots
Wouter Beugeling, Götz S. Uhrig, Frithjof B. Anders
Quantum dots in GaAs/InGaAs structures have been proposed as a candidate system for realizing quantum computing. The short coherence time of the electronic quantum state that arise…
Emergent quantum Hall effects below mT in a two-dimensional topological insulator
Saquib Shamim, Wouter Beugeling, Jan Böttcher +7
The realization of the quantum spin Hall effect in HgTe quantum wells has led to the development of topological materials which, in combination with magnetism and superconductivity…
Self-Consistent Model for Gate Control of Narrow-, Broken-, and Inverted-Gap (Topological) Heterostructures
Maximilian Hofer, Christopher Fuchs, Moritz Siebert +8
Even small electrostatic potentials can dramatically influence the band structure of narrow-, broken-, and inverted-gap materials. A quantitative understanding often necessitates a…
Global characteristics of all eigenstates of local many-body Hamiltonians: participation ratio and entanglement entropy
Wouter Beugeling, Alexei Andreanov, Masudul Haque
In the spectrum of many-body quantum systems, the low-energy eigenstates were the traditional focus of research. The interest in the statistical properties of the full eigenspectru…
Interacting topological edge channels
Jonas Strunz, Jonas Wiedenmann, Christoph Fleckenstein +10
Electrical currents in a quantum spin Hall insulator are confined to the boundary of the system. The charge carriers can be described as massless relativistic particles, whose spin…
Wiedemann-Franz behavior at the Weyl points in compressively strained HgTe
Abu Alex Aravindnath, Yi-Ju Ho, Fabian Schmitt +6
Weyl semimetals, with their unique electronic band structure, have drawn significant interest for their potential to explore quantum anomalies in condensed matter systems. In this…
Off-diagonal matrix elements of local operators in many-body quantum systems
Wouter Beugeling, Roderich Moessner, Masudul Haque
In the time evolution of isolated quantum systems out of equilibrium, local observables generally relax to a long-time asymptotic value, governed by the expectation values (diagona…
Electron-hole scattering limited transport of Dirac fermions in a topological insulator
Valentin L. Müller, Yuan Yan, Oleksiy Kashuba +6
We experimentally investigate the effect of electron temperature on transport in the two-dimensional Dirac surface states of the three-dimensional topological insulator HgTe. We fi…
Statistical properties of eigenstate amplitudes in complex quantum systems
Wouter Beugeling, Arnd Bäcker, Roderich Moessner +1
We study the eigenstates of quantum systems with large Hilbert spaces, via their distribution of wavefunction amplitudes in a real-space basis. For single-particle 'quantum billiar…
Topological band inversion in HgTe(001): surface and bulk signatures from photoemission
Raphael C. Vidal, Giovanni Marini, Lukas Lunczer +14
HgTe is a versatile topological material and has enabled the realization of a variety of topological states, including two- and three-dimensional (3D) topological insulators and to…
Counterpropagating topological and quantum Hall edge channels
Saquib Shamim, Pragya Shekhar, Wouter Beugeling +7
The survival of the quantum spin Hall edge channels in presence of an external magnetic field has been a subject of experimental and theoretical research. The inversion of Landau l…
Anisotropic sub-band splitting mechanisms in strained HgTe: a first principles study
Eeshan Ketkar, Giovanni Marini, Pietro Maria Forcella +3
Mercury telluride is a canonical material for realizing topological phases, yet a full understanding of its electronic structure remains challenging due to subtle competing effects…