Quantum spin chains with site dissipation

Details Quantum spin chains with site dissipation Quantum spin chains with site dissipation

2004-12-20

arxiv.org/abs/cond-mat/0412529v1

J. Phys. Soc. Jpn. Suppl. 74, 67 (2005)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

We use Monte Carlo simulations to study chains of Ising- and XY-spins with dissipation coupling to the site variables. The phase diagram and critical exponents of the dissipative Ising chain in a transverse magnetic field have been computed previously, and here we consider a universal ratio of susceptibilities. We furthermore present the phase diagram and exponents of the dissipative XY-chain, which exhibits a second order phase transition. All our results compare well with the predictions from a dissipative $\phi^4$ field theory.

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