Emergent topology and dynamical quantum phase transitions in two-dimensional closed quantum systems

Bhattacharya, Utso ; Dutta, Amit (2017) Emergent topology and dynamical quantum phase transitions in two-dimensional closed quantum systems Physical Review B, 96 (1). ISSN 2469-9950

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Official URL: http://doi.org/10.1103/PhysRevB.96.014302

Related URL: http://dx.doi.org/10.1103/PhysRevB.96.014302

Abstract

We introduce the notion of a dynamical topological order parameter (DTOP) that characterises dynamical quantum phase transitions (DQPTs) occurring in the subsequent temporal evolution of "two dimensional" closed quantum systems, following a quench (or ramping) of a parameter of the Hamiltonian, {which generalizes the notion of DTOP introduced in Budich and Heyl, Phys. Rev. B 93, 085416 (2016) for one-dimensional situations}. This DTOP is obtained from the "gauge-invariant" Pancharatnam phase extracted from the Loschmidt overlap, i.e., the modulus of the overlap between the initially prepared state and its time evolved counterpart reached following a temporal evolution generated by the time-independent final Hamiltonian. This generic proposal is illustrated considering DQPTs occurring in the subsequent temporal evolution following a sudden quench of the staggered mass of the topological Haldane model on a hexagonal lattice where it stays fixed to zero or unity and makes a discontinuous jump between these two values at critical times at which DQPTs occur.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:117169
Deposited On:16 Apr 2021 04:34
Last Modified:16 Apr 2021 04:34

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