Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 89: Disordered Quantum Systems

TT 89.3: Talk

Thursday, March 15, 2018, 12:00–12:15, HFT-FT 131

Loschmidt amplitude in disordered spin systems — •Sebastian Paeckel¹, Francisco Simao¹, Timo Mutas², Thomas Köhler¹, Markus Schmitt¹, and Salvatore Manmana¹ — ¹Institut für Theoretische Physik, Georg August Universität Göttingen, Germany — ²University of Copenhagen, Copenhagen, Denmark

Motivated by recent studies on systems exhibiting time translational symmetry breaking [1,2] we investigated the Loschmidt echo for disordered spins systems with special focus onto the transverse Ising model. Starting from the Z₂ symmetric limit (h_z ≡ 0) we analytically calculated the time-evolution for various short ranged correlated initial states. Our results enable us to draw an intuitive picture for the emergence of time translational symmetry breaking which also permits to generalize our findigs to the case of h_z ≠ 0 and consider more elaborated systems breaking Z_n symmetry.

We acknowledge funding by DFG FOR 1807.
D V. Else, B Bauer, Ch Nayak, Phys. Rev. Lett. 117, 090402
K. Sacha, J. Zakrzewski, arXiv:1704.03735