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Cambridge University Press eBooks

Non-Equilibrium Dynamics Across Quantum Critical Points: Slow Quenching

Amit Dutta, G. Aeppli, Bikas K. Chakrabarti, Uma Divakaran, T. F. Rosenbaum, Diptiman Sen

Published Jan 28, 2015• 0 citations
Publisher
DOI
10.1017/cbo9781107706057.011

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We study the non-equilibrium dynamics of a quantum system close to a quantum multi-critical point (MCP) using the example of a one-dimensional spin-1/2 transverse XY spin chain. We summarize earlier results of defect generenation and fidelity susceptibility for quenching through MCP and close to the MCP, respectively. For a quenching scheme which enables the system to hit the MCP along different paths, we emphasize the role of path on exponents associated with quasicritical points which appear in the scaling relations. Finally, we explicitly derive the scaling of concurrence and negativity for two spin entanglement generated following a slow quenching across the MCP and enlist the results for different quenching schemes. We explicity show the dependence of the scaling on the quenching path and dicuss the limiting situations.
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