226 citations · 1.2k across the 46 of their papers we have counts for
35 papers · 1 filter
Signatures of the Higgs mode in transport through a normal-metal--superconductor junction
Gaomin Tang, Wolfgang Belzig, Ulrich Zülicke +1
A superconductor subject to electromagnetic irradiation in the terahertz range can show amplitude oscillations of its order parameter. However, coupling this so-called Higgs mode t…
Collinear Orbital Antiferromagnetic Order and Magnetoelectricity in Quasi-2D Itinerant-Electron Paramagnets, Ferromagnets and Antiferromagnets
R. Winkler, U. Zülicke
We develop a comprehensive theory for magnetoelectricity in magnetically ordered quasi-2D systems whereby in thermal equilibrium an electric field can induce a magnetization an…
Longitudinal magnetoconductivity and magnetodielectric effect in bilayer graphene
U. Zülicke, R Winkler
It was recently shown that a finite imbalance between electron densities in the and valleys of bilayer graphene induces a magnetoelectric coupling. Here…
Coulomb-exchange effects in nanowires with spin splitting due to a radial electric field
F. S. Gray, T. Kernreiter, M. Governale +1
We present a theoretical study of Coulomb exchange interaction for electrons confined in a cylindrical quantum wire and subject to a Rashba-type spin-orbit coupling with radial ele…
Spin susceptibility of two-dimensional transition metal dichalcogenides
H. Hatami, T. Kernreiter, U. Zülicke
We have obtained analytical expressions for the q-dependent static spin susceptibility of monolayer transition metal dichalcogenides, considering both the electron-doped and hole-d…
Exporting superconductivity across the gap: Proximity effect for semiconductor valence-band states due to contact with a simple-metal superconductor
A. G. Moghaddam, T. Kernreiter, M. Governale +1
The proximity effect refers to the phenomenon whereby superconducting properties are induced in a normal conductor that is in contact with an intrinsically superconducting material…
Signatures of tunable Majorana-fermion edge states
Rakesh P. Tiwari, U. Zülicke, C. Bruder
Chiral Majorana-fermion modes are shown to emerge as edge excitations in a superconductor--topological-insulator hybrid structure that is subject to a magnetic field. The velocity…
Valley filter from magneto-tunneling between single and bi-layer graphene
L Pratley, U. Zuelicke
We consider tunneling transport between two parallel graphene sheets where one is a single-layer sample and the other one a bilayer. In the presence of an in-plane magnetic field,…
Neutral edge modes in a superconductor -- topological-insulator hybrid structure in a perpendicular magnetic field
Rakesh P. Tiwari, U. Zülicke, C. Bruder +1
We study the low-energy edge states of a superconductor -- 3D topological-insulator hybrid structure (NS junction) in the presence of a perpendicular magnetic field. The hybridizat…
Magneto-tunnelling spectroscopy of chiral two-dimensional electron systems
L. Pratley, U. Zuelicke
We present a theoretical study of momentum-resolved tunneling between parallel two-dimensional conductors whose charge carriers have a (pseudo-)spin-1/2 degree of freedom that is s…
Suppression of Coulomb exchange energy in quasi-two-dimensional hole systems
T. Kernreiter, M. Governale, R. Winkler +1
We have calculated the exchange-energy contribution to the total energy of quasi-two-dimensional hole systems realized by a hard-wall quantum-well confinement of valence-band state…
Anisotropic Zeeman splitting in p-type GaAs quantum point contacts
Y. Komijani, M. Csontos, I. Shorubalko +5
Low-temperature electrical conductance spectroscopy measurements of quantum point contacts implemented in p-type GaAs/AlGaAs heterostructures are used to study the Zeeman splitting…
Majorana fermions from Landau quantization in a superconductor--topological-insulator hybrid structure
Rakesh P. Tiwari, U. Zülicke, C. Bruder
We show that the interplay of cyclotron motion and Andreev reflection experienced by massless-Dirac-like charge carriers in topological-insulator surface states generates a Majoran…
Tracking the energies of one-dimensional subband edges in quantum point contacts using dc conductance measurements
A. P. Micolich, U. Zülicke
The semiconductor quantum point contact has long been a focal point for studies of one-dimensional electron transport. Their electrical properties are typically studied using ac co…
Static polarizability of two-dimensional hole gases
T. Kernreiter, M Governale, U. Zuelicke
We have calculated the density-density (Lindhard) response function of a homogeneous two-dimensional (2D) hole gas in the static (omega=0) limit. The bulk valence-band structure co…
AC transport properties of single and bilayer graphene
J. Z. Bernad, U. Zuelicke, K. Ziegler
We have performed a theoretical study of electronic transport in single and bilayer graphene based on the standard linear-response (Kubo) formalism and continuum-model descriptions…
Features due to spin-orbit coupling in the optical conductivity of single-layer graphene
P. Ingenhoven, J. Z. Bernad, U. Zuelicke +1
We have calculated the optical conductivity of a disorder-free single graphene sheet in the presence of spin-orbit coupling, using the Kubo formalism. Both intrinsic and structural…
Observation of orientation- and -dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures
J. C. H. Chen, O. Klochan, A. P. Micolich +6
We study the Zeeman spin-splitting in hole quantum wires oriented along the and crystallographic axes of a high mobility undoped (100)-oriented AlGaAs/GaAs he…
Time reversal of pseudo-spin 1/2 degrees of freedom
R. Winkler, U. Zülicke
We show that pseudo-spin 1/2 degrees of freedom can be categorized in two types according to their behavior under time reversal. One type exhibits the properties of ordinary spin w…
Effects of a continuous quantum measurement on the electric conductivity: Application to graphene
J. Z. Bernad, M. Jaaskelainen, U. Zuelicke
We use linear-response theory to evaluate the frequency-dependent conductivity of a system subject to a continuous quantum measurement of the current. Application of this formalism…
Anomalous Spin-Related Quantum Phase in Mesoscopic Hole Rings
M. Jaaskelainen, U. Zuelicke
We have obtained numerically exact results for the spin-related geometric quantum phases that arise in p-type semiconductor ring structures. The interplay between gate-controllable…
Invariant expansion for the trigonal band structure of graphene
R. Winkler, U. Zülicke
We present a symmetry analysis of the trigonal band structure in graphene, elucidating the transformational properties of the underlying basis functions and the crucial role of tim…
Ring--Shaped Andreev Billiards in Quantizing Magnetic Fields
J. Cserti, P. Polinák, G. Palla +2
We present a detailed semiclassical study of a clean disk--shaped insulator--normal-metal--superconductor hybrid system in a magnetic field. It is based on an exact secular equatio…
Momentum-Resolved Tunneling into Fractional Quantum Hall Edges
U. Zuelicke, E. Shimshoni, M. Governale
Tunneling from a two-dimensional contact into quantum-Hall edges is considered theoretically for a case where the barrier is extended, uniform, and parallel to the edge. In contras…