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arXiv 2511.09643cond-mat.quant-gascond-mat.str-el
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耗散玻色-哈伯德模型的函数重整化群研究

Functional renormalization group study of a dissipative Bose--Hubbard model

Oscar Bouverot-Dupuis, Vincent Grison, Nicolas Paris

AI总结:

本研究利用非微扰函数重整化群(FRG)分析一维耗散玻色-哈伯德模型的相图,识别出卢廷格液体不动点线与耗散不动点两个低能区域,建立了描述一维耗散量子相的统一框架。

摘要:

我们使用非微扰函数重整化群(FRG)研究一维耗散玻色-哈伯德模型的相图。每个格点与独立热库耦合,产生编码非马尔可夫耗散的长程时间相互作用。针对欧姆、亚欧姆和超欧姆等广泛的热库谱类,我们识别出两个竞争的低能区域:卢廷格液体不动点线,以及具有有限压缩性、零超流刚度和普适标度指数的耗散不动点,二者由贝雷津斯基-科斯特利茨-索利斯相变分隔。FRG框架至关重要,因其能从单一微观作用量获取完整重整化群流和所有不动点,超出微扰或变分方法的范围。本工作为描述一维耗散量子相建立了统一且可系统改进的框架。

英文摘要:

We investigate the phase diagram of a one-dimensional dissipative Bose-Hubbard model using the nonperturbative functional renormalization group (FRG). Each lattice site is coupled to an independent bath, generating long-range temporal interactions that encode non-Markovian dissipation. For a broad class of bath spectra -- ohmic, sub-ohmic, and super-ohmic -- we identify two competing low-energy regimes: a Luttinger-liquid line of fixed points and a dissipative fixed point characterized by finite compressibility, vanishing superfluid stiffness, and universal scaling exponents, separated by a Berezinskii-Kosterlitz-Thouless transition. The FRG framework is essential here, as it provides access to the complete renormalization group flow and all fixed points from a single microscopic action, beyond the reach of perturbative or variational methods. This work establishes a unified and systematically improvable framework for describing dissipative quantum phases in one dimension.

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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