Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 88: Quantum-Critical Phenomena III
TT 88.5: Vortrag
Donnerstag, 15. März 2018, 12:30–12:45, H 3010
Quantum phase transition with dissipative frustration — •Dominik Maile1,2, Sabine Andergassen2, Wolfgang Belzig1, and Gianluca Rastelli1,3 — 1Fachbereich Physik, Universität Konstanz, D-78457, Germany — 2Institut für Theoretische Physik and Center of Quantum Science, Auf der Morgenstelle 14, Universität Tübingen, D-72076 Tübingen, Germany — 3Zukunftskolleg, Universität Konstanz, D-78457, Konstanz, Germany
We study the quantum phase transition of the one dimensional phase model in presence of dissipative frustration,
provided by an interaction of the system with the environment through two non-commuting operators [1]. Such a model can be realized in Josephson junction chains with shunt resistances and resistances between the chain and the ground. Using a self-consistent harmonic approximation, we determine the phase diagram at zero temperature which exhibits a quantum phase transition between a long-range ordered phase, corresponding to the superconducting state, and a disordered phase, corresponding to the insulating state with localized superconducting charge. Interestingly, we find that the critical line separating the two phases has a non monotonic behavior as a function of the dissipative coupling strength. The non monotonic behavior is reflected also in the purity of the system that quantifies the degree of correlation between the system and the environment, and the logarithmic negativity as entanglement measure that encodes the internal quantum correlations in the chain.
D. Maile, S. Andergassen, W. Belzig, G. Rastelli, arXiv:1711.11346