40 citations · 329 across the 23 of their papers we have counts for
23 papers
Neutral magic-angle bilayer graphene: Condon instability and chiral resonances
T. Stauber, M. Wackerl, P. Wenk +4
We discuss the full optical response of twisted bilayer graphene at the neutrality point close to the magic angle within the continuum model (CM). Firstly, we identify three differ…
Topological transitions in two-dimensional Floquet superconductors
Paul Wenk, Milena Grifoni, John Schliemann
We demonstrate the occurrence of a topological phase transition induced by an effective magnetic field in a two-dimensional electron gas with spin-orbit coupling and in proximity t…
Many-Body Localization: Transitions in Spin Models
John Schliemann, Joao Vitor I. Costa, Paul Wenk +1
We study the transitions between ergodic and many-body localized phases in spin systems, subject to quenched disorder, including the Heisenberg chain and the central spin model. In…
Persistent spin textures and currents in wurtzite nanowire-based quantum structures
Michael Kammermeier, Adrian Seith, Paul Wenk +1
We explore the spin and charge properties of electrons in wurtzite semiconductor nanowires where radial and axial confinement leads to tubular or ring-shaped quantum structures. Ac…
Floquet-Drude conductivity
Martin Wackerl, Paul Wenk, John Schliemann
This letter presents a generalization of the Drude conductivity for systems which are exposed to periodic driving. The probe bias is treated perturbatively by using the Kubo formul…
In-plane magnetoelectric response in bilayer graphene
Michael Kammermeier, Paul Wenk, Ulrich Zülicke
A graphene bilayer shows an unusual magnetoelectric response whose magnitude is controlled by the valley-isospin density, making it possible to link magnetoelectric behavior to val…
Ultralong spin lifetimes in one-dimensional semiconductor nanowires
Florian Dirnberger, Michael Kammermeier, Jan König +9
We experimentally demonstrate ultralong spin lifetimes of electrons in the one-dimensional (1D) quantum limit of semiconductor nanowires. Optically probing single wires of differen…
Spin relaxation in wurtzite nanowires
Michael Kammermeier, Paul Wenk, Florian Dirnberger +2
We theoretically investigate the D'yakonov-Perel' spin relaxation properties in diffusive wurtzite semiconductor nanowires and their impact on the quantum correction to the conduct…
Driven Hofstadter Butterflies and Related Topological Invariants
Martin Wackerl, Paul Wenk, John Schliemann
The properties of the Hofstadter butterfly, a fractal, self similar spectrum of a two dimensional electron gas, are studied in the case where the system is additionally illuminated…
Magnetoconductance correction in zinc-blende semiconductor nanowires with spin-orbit coupling
Michael Kammermeier, Paul Wenk, John Schliemann +3
We study the effects of spin-orbit coupling on the magnetoconductivity in diffusive cylindrical semiconductor nanowires. Following up on our former study on tubular semiconductor n…
Control of Spin Helix Symmetry in Semiconductor Quantum Wells by Crystal Orientation
Michael Kammermeier, Paul Wenk, John Schliemann
We investigate the possibility of spin-preserving symmetries due to the interplay of Rashba and Dresselhaus spin-orbit coupling in n-doped zinc-blende semiconductor quantum wells o…
Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling
Michael Kammermeier, Paul Wenk, John Schliemann +2
We compute analytically the weak (anti)localization correction to the Drude conductivity for electrons in tubular semiconductor systems of zinc blende type. We include linear Rashb…
Trigonal Warping in Bilayer Graphene: Energy versus Entanglement Spectrum
Sonja Predin, Paul Wenk, John Schliemann
We present a mainly analytical study of the entanglement spectrum of Bernal-stacked graphene bilayers in the presence of trigonal warping in the energy spectrum. Upon tracing out o…
Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling
Paul Wenk, Michael Kammermeier, John Schliemann
We derive an effective Hamiltonian for a (001)-confined quasi-two-dimensional hole gas in a strained zincblende semiconductor heterostructure including both Rashba and Dresselhaus…
Lifetimes of Magnons in Two-Dimensional Diluted Ferromagnetic Systems
Akash Chakraborty, Paul Wenk, John Schliemann
Spin dynamics in low dimensional magnetic systems has been of fundamental importance for a long time and has currently received an impetus owing to the emerging field of nanoelectr…
Signatures of spin-preserving symmetries in two-dimensional hole gases
Tobias Dollinger, Michael Kammermeier, Andreas Scholz +4
We investigate ramifications of the persistent spin helix symmetry in two-dimensional hole gases in the conductance of disordered mesoscopic systems. To this end we extend previous…
Plasmons in spin-orbit coupled two-dimensional hole gas systems
Andreas Scholz, Tobias Dollinger, Paul Wenk +2
We study the dynamical dielectric function of a two-dimensional hole gas, exemplified on [001]-GaAs and InAs quantum wells, within the Luttinger model extended to the two lowest su…
Spin-wave excitations in presence of nanoclusters of magnetic impurities
Akash Chakraborty, Paul Wenk, Stefan Kettemann +2
Nanoscale inhomogeneities and impurity clustering are often found to drastically affect the magnetic and transport properties in disordered/diluted systems, giving rise to rich and…
Spontaneous magnetization in presence of nanoscale inhomogeneities in diluted magnetic systems
Akash Chakraborty, Paul Wenk, Richard Bouzerar +1
The presence of nanoscale inhomogeneities has been experimentally evidenced in several diluted magnetic systems, which in turn often leads to interesting physical phenomena. Howeve…
Spin Hall Conductivity on the Anisotropic Triangular Lattice
Paul Wenk, Stefan Kettemann, Georges Bouzerar
We present a detailed study of the spin Hall conductivity on a two-dimensional triangular lattice in the presence of Rashba spin-orbit coupling. In particular, we focus part of our…
Spin Relaxation in Quantum Wires
Paul Wenk, Stefan Kettemann
The spin dynamics and spin relaxation of itinerant electrons in quantum wires with spin-orbit coupling is reviewed. We give an introduction to spin dynamics, and review spin-orbit…
Direction Dependence of Spin Relaxation in Confined 2D Systems
Paul Wenk, Stefan Kettemann
The dependence of spin relaxation on the direction of the quantum wire under Rashba and Dresselhaus (linear and cubic) spin orbit coupling is studied. Comprising the dimensional re…
Dimensional Dependence of Weak Localization Corrections and Spin Relaxation in Quantum Wires with Rashba Spin-Orbit Coupling
P. Wenk, S. Kettemann
The quantum correction to the conductivity in disordered quantum wires with linear Rashba spin-orbit coupling is obtained. For quantum wires with spin-conserving boundary condition…