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Anderson impurity model at finite Coulomb interaction U : Generalized noncrossing approximation
We present an extension of the noncrossing approximation (NCA), which is widely used to calculate properties of Anderson impurity models in the limit of infinite Coulomb repulsionExpand
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Thermal and electrical transport across a magnetic quantum critical point
A quantum critical point (QCP) arises when a continuous transition between competing phases occurs at zero temperature. Collective excitations at magnetic QCPs give rise to metallic properties thatExpand
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Konturen der digitalen Arbeitswelt
Zusammenfassung:Trotz der Bedeutung von Computern und Internet für die Arbeitswelt gibt es bislang überraschend wenig vertiefende quantitative Analysen zu den Einflussfaktoren der beruflichen NutzungExpand
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Kondo Destruction and Quantum Criticality in Kondo Lattice Systems
Considerable efforts have been made in recent years to theoretically understand quantum phase transitions in Kondo lattice systems. A particular focus is on Kondo destruction, which leads to quantumExpand
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Quantum criticality out of equilibrium: steady state in a magnetic single-electron transistor.
Quantum critical systems out of equilibrium are of extensive interest, but are difficult to study theoretically. We consider here the steady-state limit of a single-electron transistor withExpand
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Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction
We address the phenomenon of critical Kondo destruction in pseudogap Bose-Fermi Anderson and Kondo quantum impurity models. These models describe a localized level coupled both to a fermionic bathExpand
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Quantum criticality in ferromagnetic single-electron transistors.
Considerable evidence exists for the failure of the traditional theory of quantum critical points, pointing to the need to incorporate novel excitations. The destruction of Kondo entanglement and theExpand
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Arbeiten in der Plattformökonomie: Grundlagen und Grenzen von „Cloudwork“ und „Gigwork“
ZusammenfassungIn der Plattformökonomie organisieren Unternehmen, wie Uber, Airbnb, Deliveroo oder Upwork, bezahlte Arbeit direkt auf digitalen Marktplätzen im Internet. Diese Form bezahlter ArbeitExpand
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Magnetic single-electron transistor as a tunable model system for Kondo-destroying quantum criticality
Abstract Single-electron transistor (SET) attached to ferromagnetic leads can undergo a continuous quantum phase transition as their gate voltage is tuned. The corresponding quantum critical pointExpand
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Fermi-surface collapse and dynamical scaling near a quantum-critical point
Quantum criticality arises when a macroscopic phase of matter undergoes a continuous transformation at zero temperature. While the collective fluctuations at quantum-critical points are beingExpand
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