arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0811.3754cond-mat.str-elcond-mat.dis-nn
收藏

耗散随机量子伊辛模型中的涂抹量子相变

Smeared quantum phase transition in the dissipative random quantum Ising model

Thomas Vojta, J. A. Hoyos

摘要:

研究了随机横场伊辛模型在欧姆耗散影响下的量子相变。为此,我们数值实现了一个强无序重整化群计划。我们发现欧姆耗散破坏了量子临界点和相关的量子格里菲思相的涂抹。我们的研究结果定量证实了最近的理论[物理评论快报。{ \bf 100},240601(2008)]的模糊量子相变。

英文摘要:

We investigate the quantum phase transition in the random transverse-field Ising model under the influence of Ohmic dissipation. To this end, we numerically implement a strong-disorder renormalization-group scheme. We find that Ohmic dissipation destroys the quantum critical point and the associated quantum Griffiths phase by smearing. Our results quantitatively confirm a recent theory [Phys. Rev. Lett. {\bf 100}, 240601 (2008)] of smeared quantum phase transitions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑