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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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|
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