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Adiabatic dynamics in passage across quantum critical lines and gapless phases
D. Chowdhury, , A. Dutta
Published in AMER PHYSICAL SOC
2010
Volume: 81
   
Issue: 1
Abstract
It is well known that the dynamics of a quantum system is always nonadiabatic in passage through a quantum critical point and the defect density in the final state following a quench shows a power-law scaling with the rate of quenching. However, we propose here a possible situation where the dynamics of a quantum system in passage across quantum critical regions is adiabatic and the defect density decays exponentially. This is achieved by incorporating additional interactions which lead to quantum critical behavior and gapless phases but do not participate in the time evolution of the system. To illustrate the general argument, we study the defect generation in the quantum critical dynamics of a spin-1/2 anisotropic quantum XY spin chain with three spin interactions and a linearly driven staggered magnetic field. © 2010 The American Physical Society.
About the journal
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
PublisherAMER PHYSICAL SOC
ISSN15393755
Open AccessNo