266 citations · 1.4k across the 27 of their papers we have counts for
15 papers · 1 filter
Extraordinary Lifetime Enhancement of Coherent Phonon-Amplitude Modes in the Excitonic Insulator Phase of Ta2Pd3Te5
Anjan Kumar N M, Shuhan Wang, Snehashish Chatterjee +9
The excitonic insulator (EI) is an electronic phase of condensed excitons. However, in many prototypical materials the presence of a concurrent structural transition complicates th…
Floquet Product Mode
Hsiu-Chung Yeh, Achim Rosch, Aditi Mitra
Results are presented for the dynamics of edge modes in interacting Floquet Ising chains. It is shown that in addition to the quasi-stable and edge modes, a third long live…
Quantum impurity in a Tomonaga-Luttinger liquid: continuous-time quantum Monte Carlo approach
K. Hattori, A. Rosch
We develop a continuous-time quantum Monte Carlo (CTQMC) method for quantum impurities coupled to interacting quantum wires described by a Tomonaga-Luttinger liquid. The method is…
Orbitally controlled Kondo effect of Co ad-atoms on graphene
T. O. Wehling, A. V. Balatsky, M. I. Katsnelson +2
Based on ab-initio calculations we identify possible scenarios for the Kondo effect due to Co ad-atoms on graphene. General symmetry arguments show that for magnetic atoms in high-…
Emergent Lorentz symmetry with vanishing velocity in a critical two-subband quantum wire
M. Sitte, A. Rosch, J. S. Meyer +2
We consider a quantum wire with two subbands of spin-polarized electrons in the presence of strong interactions. We focus on the quantum phase transition when the second subband st…
Mott transition of fermionic atoms in a three-dimensional optical trap
R. W. Helmes, T. A. Costi, A. Rosch
We study theoretically the Mott metal-insulator transition for a system of fermionic atoms confined in a three-dimensional optical lattice and a harmonic trap. We describe an inhom…
Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
J. Paaske, A. Rosch, P. Woelfle +3
The Kondo-effect is a many-body phenomenon arising due to conduction electrons scattering off a localized spin. Coherent spin-flip scattering off such a quantum impurity correlates…
Nonequilibrium Transport through a Kondo Dot in a Magnetic Field: Perturbation Theory
J. Paaske, A. Rosch, P. Wölfle
Using nonequilibrium perturbation theory, we investigate the nonlinear transport through a quantum dot in the Kondo regime in the presence of a magnetic field. We calculate the lea…
Spectral function of the Kondo model in high magnetic fields
A. Rosch, T. A. Costi, J. Paaske +1
Using a recently developed perturbative renormalization group (RG) scheme, we calculate analytically the spectral function of a Kondo impurity for either large frequencies w or lar…
Some remarks about pseudo gap behavior of nearly antiferromagnetic metals
A. Rosch
In the antiferromagnetically ordered phase of a metal, gaps open on parts of the Fermi surface if the Fermi volume is sufficiently large. We discuss simple qualitative and heuristi…
Pressure-induced residual resistivity anomaly in CeCu_5Au
H. Wilhelm, S. Raymond, D. Jaccard +3
The electrical resistivity of the magnetically ordered CeCu_5Au has been investigated under pressure up to 8.5 GPa. In the magnetically ordered region (p<3.4 GPa) the residual resi…
Conductivity of a clean one-dimensional wire
A. Rosch, N. Andrei
We study the low-temperature low-frequency conductivity sigma of an interacting one dimensional electron system in the presence of a periodic potential. The conductivity is strongl…
Disorder effects on transport near AFM quantum phase transitions
A. Rosch
We discuss three different scenarios recently proposed to account for the non-Fermi liquid behavior near antiferromagnetic (AFM) quantum critical points in heavy-Fermion systems: (…
Interplay of disorder and spin fluctuations in the resistivity near a quantum critical point
A. Rosch
The resistivity in metals near an antiferromagnetic quantum critical point (QCP) is strongly affected by small amounts of disorder. In a quasi-classical treatment, we show that an…
Giant mass and anomalous mobility of particles in fermionic systems
A. Rosch, T. Kopp
We calculate the mobility of a heavy particle coupled to a Fermi sea within a non-perturbative approach valid at all temperatures. The interplay of particle recoil and of strong co…