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arXiv 0705.1865cond-mat.str-el
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耗散对无序量子临界点的影响

Effects of dissipation on a quantum critical point with disorder

J. A. Hoyos, Chetan Kotabage, Thomas Vojta

摘要:

将强无序重整化群应用到Landau-Ginzburg-Wilson场论中,研究了耗散对O $(N)$序参量对称的无序量子相变的影响.我们发现欧姆耗散导致非微扰的无限随机临界点与非常规的激活动力学标度,而超欧姆阻尼导致常规的行为。我们讨论了纳米线中超导体-金属转变和赫兹巡游反铁磁转变理论的应用。

英文摘要:

We study the effects of dissipation on a disordered quantum phase transition with O$(N)$ order parameter symmetry by applying a strong-disorder renormalization group to the Landau-Ginzburg-Wilson field theory of the problem. We find that Ohmic dissipation results in a non-perturbative infinite-randomness critical point with unconventional activated dynamical scaling while superohmic damping leads to conventional behavior. We discuss applications to the superconductor-metal transition in nanowires and to Hertz' theory of the itinerant antiferromagnetic transition.

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。

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