Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 87: Low-dimensional systems: Topological order 2 (TT with DS/HL/MA/O)

HL 87.4: Vortrag

Donnerstag, 19. März 2015, 15:45–16:00, H 3010

Topological phase transition in the quench dynamics of a Fermi gas — •Pei Wang — Department of Physics, Zhejiang University of Technology, Hangzhou 310023, China and Institute for Theoretical Physics, University of Goettingen, German

We study the quench dynamics of a one-dimensional ultracold Fermi gas with synthetic spin-orbit coupling. At equilibrium, the ground state of the system can undergo a topological phase transition and become a topological superfluid with Majorana edge states. As the interaction is quenched near the topological phase boundary, we identify an interesting dynamical phase transition of the quenched state in the long-time limit, characterized by an abrupt change of the pairing gap at a critical quenched interaction strength. We further demonstrate the topological nature of this dynamical phase transition from edge-state analysis of the quenched states. Our findings provide interesting clues for the understanding of topological phase transitions in dynamical processes, and can be useful for the dynamical detection of Majorana edge states in corresponding systems.