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arXiv 1002.3369cond-mat.stat-mechcond-mat.str-el
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耗散量子伊辛模型的蒙特卡罗模拟

Monte Carlo simulations of dissipative quantum Ising models

Iver B. Sperstad, Einar B. Stiansen, Asle Sudbo

摘要:

动力学临界指数$z$是表征量子临界性的一个基本量,众所周知,量子模型中耗散的存在对$z$的值有重要影响。利用MonteCarlo方法研究了量子Ising自旋模型,在不同的耗散形式下,估计了动力学临界指数$z$和关联长度指数$ν$.对于具有欧姆位耗散的二维量子伊辛模型,我们得到了相应的一维情形的$z \approx 2$,而对于具有欧姆键耗散的一维量子伊辛模型,我们得到了$z \approx 1$的估计.

英文摘要:

The dynamical critical exponent $z$ is a fundamental quantity in characterizing quantum criticality, and it is well known that the presence of dissipation in a quantum model has significant impact on the value of $z$. Studying quantum Ising spin models using Monte Carlo methods, we estimate the dynamical critical exponent $z$ and the correlation length exponent $ν$ for different forms of dissipation. For a two-dimensional quantum Ising model with Ohmic site dissipation, we find $z \approx 2$ as for the corresponding one-dimensional case, whereas for a one-dimensional quantum Ising model with Ohmic bond dissipation we obtain the estimate $z \approx 1$.

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