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Equilibrium and non-equilibrium dynamics of the sub-ohmic spin-boson model
Frithjof B. Anders, Ralf Bulla, Matthias Vojta
Employing the non-perturbative numerical renormalization group method, we study the dynamics of the spin-boson model, which describes a two-level system coupled to a bosonic bath w…
Quantum criticality in a double quantum-dot system
Gergely Zarand, Chung-Hou Chung, Pascal Simon +1
We discuss the realization of the quantum-critical non-Fermi liquid state, originally discovered within the two-impurity Kondo model, in double quantum-dot systems. Contrary to the…
Pressure dependence of the magnetization of URu2Si2
C. Pfleiderer, J. A. Mydosh, M. Vojta
The ground state of URu2Si2 changes from so-called hidden order (HO) to large-moment antiferromagnetism (LMAF) upon applying hydrostatic pressure in excess of 14 kbar. We report th…
A mean-field theory for strongly disordered non-frustrated antiferromagnets
Heidrun Weber, Matthias Vojta
Motivated by impurity-induced magnetic ordering phenomena in spin-gap materials like TlCuCl3, we develop a mean-field theory for strongly disordered antiferromagnets, designed to c…
Fermi-liquid instabilities at magnetic quantum phase transitions
Hilbert v. Löhneysen, Achim Rosch, Matthias Vojta +1
This review discusses instabilities of the Fermi-liquid state of conduction electrons in metals with particular emphasis on magnetic quantum critical points. Both the existing theo…
Universal crossovers and critical dynamics of quantum phase transitions: A renormalization group study of the pseudogap Kondo problem
Lars Fritz, Serge Florens, Matthias Vojta
The pseudogap Kondo problem, describing a magnetic impurity embedded in an electronic environment with a power-law density of states, displays continuous quantum phase transitions…