Theory of defect production in nonlinear quench across a quantum critical point

Mondal, Shreyoshi and Sengupta, K and Sen, Diptiman (2009) Theory of defect production in nonlinear quench across a quantum critical point. In: Physical Review B, 79 (4). 045128-1-045128-9.

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Abstract

We study defect production in a quantum system subjected to a nonlinear power-law quench which takes it either through a quantum critical or multicritical point or along a quantum critical line. We elaborate on our earlier work [D. Sen, K. Sengupta, and S. Mondal, Phys. Rev. Lett. 101, 016806 (2008)] and present a detailed analysis of the scaling of the defect density n with the quench rate tau and exponent alpha for each of the above-mentioned cases. We also compute the correlation functions for defects generated in nonlinear quenches through a quantum critical point and discuss the dependence of the amplitudes of such correlation functions on the exponent alpha. We discuss several experimental systems where these theoretical predictions can be tested.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to American Physical Society.
Keywords:	critical exponents;critical points;defect states;quantum theory.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	30 Oct 2009 10:29
Last Modified:	19 Sep 2010 05:27
URI:	http://eprints.iisc.ernet.in/id/eprint/19173

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