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Journal Article

Nonequilibrium dynamics of a system with two kinds of fermions after a pulse


Zvyagin,  A. A.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Zvyagin, A. A. (2017). Nonequilibrium dynamics of a system with two kinds of fermions after a pulse. Physical Review B, 95(7): 075122. doi:10.1103/PhysRevB.95.075122.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-38D2-0
The nonequilibrium evolution of the system of two kinds of fermions under the action of a pulse of the external field has been studied. The number of fermions of each kind oscillates (with beats and decaying) as a function of the duration of the pulse about the value determined by the magnitude of the pulse, and as a function of the magnitude of the pulse. For low-dimensional systems those oscillations can serve as a non-zero-temperature manifestation of dynamical quantum phase transitions. The response of a Fermi gas or liquid in a tilted magnetic field, an edge state of a topological insulator, a quantum wire with spin-orbit coupling, and a dimerized spin-1/2 chain to the pulse can manifest such dynamical oscillations, which can be observed in experiments.