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Berry Phase and the Breakdown of the Quantum to Classical Mapping for the Quantum Critical Point of the Bose-Fermi Kondo model
Stefan Kirchner, Qimiao Si
The phase diagram of the Bose-Fermi Kondo model contains an SU(2)-invariant Kondo-screened phase separated by a continuous quantum phase transition from a Kondo-destroyed local mom…
Finite Size Scaling of Classical Long-Ranged Ising Chains and the Criticality of Dissipative Quantum Impurity Models
Stefan Kirchner, Qimiao Si, Kevin Ingersent
Motivated in part by quantum criticality in dissipative Kondo systems, we revisit the finite-size scaling of a classical Ising chain with 1/r^{2-epsilon} interactions. For 1/2<epsi…
Quantum Criticality out of Equilibrium: Steady State in a Magnetic Single-Electron Transistor
Stefan Kirchner, Qimiao Si
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 transi…
Quantum Criticality in Heavy Fermion Metals
Philipp Gegenwart, Qimiao Si, Frank Steglich
Quantum criticality describes the collective fluctuations of matter undergoing a second-order phase transition at zero temperature. Heavy fermion metals have in recent years emerge…