arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.02040cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
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节线超导体中由费米子-费米子相互作用和无序驱动的不动点附近的临界行为

Critical behavior around the fixed points driven by fermion-fermion interactions and disorders in the nodal-line superconductors

Wen-Hao Bian, Jing Wang

AI总结:

该研究利用重整化群方法探究非中心对称节线超导体中费米子相互作用与无序的耦合效应,发现8类不动点及对应低能行为,还揭示第五不动点附近的非费米液体行为与超导相变。

摘要:

我们系统研究了非中心对称节线超导体超导穹顶下短程费米子-费米子相互作用与无序散射之间的复杂相互作用。采用能无偏处理所有潜在自由度的重整化群方法,我们建立了所有相关相互作用参数的能量依赖耦合流。从这些耦合演化中解读低能信息,会在低能区域出现若干有趣的行为。首先,我们识别出8种不同类型的不动点,它们由所有相互作用参数的竞争决定,并支配着低能性质。接下来,我们仔细研究并揭示了趋近这些不动点时物理效应的不同命运。准粒子态密度在第一个不动点附近表现出与频率的线性依赖关系,而其他不动点则呈现出多样的频率依赖行为。压缩率和比热在不同不动点附近表现出独特的趋势,在第五个不动点附近出现非费米液体行为。此外,在评估了潜在态的磁化率后,我们发现当系统趋近第五个不动点时,可在临界温度以下诱导出某种相变,即从节线超导态转变为另一种超导态。本研究将增进我们对节线超导体低能区域独特行为的理解。

英文摘要:

We systematically investigate the intricate interplay between short-range fermion-fermion interactions and disorder scatterings beneath the superconducting dome of noncentrosymmetric nodal-line superconductors. Employing the renormalization group that unbiasedly treats all kinds of potential degrees of freedom, we establish energy-dependent coupled flows for all associated interaction parameters. Decoding the low-energy information from these coupled evolutions leads to the emergence of several intriguing behavior in the low-energy regime. At first, we identify eight distinct types of fixed points, which are determined by the competition of all interaction parameters and dictate the low-energy properties. Next, we carefully examine and unveil distinct fates of physical implications as approaching such fixed points. The density of states of quasiparticles displays a linear dependence on frequency around the first fixed point, while other fixed points present diverse frequency-dependent behavior. Compressibility and specific heat exhibit unique trends around different fixed points, with the emergence of non-Fermi-liquid behavior nearby the fifth fixed point. Furthermore, after evaluating the susceptibilities of the potential states, we find that a certain phase transition below the critical temperature can be induced when the system approaches the fifth fixed point, transitioning from the nodal-line superconducting state to another superconducting state. This research would enhance our understanding of the unique behavior in the low-energy regime of nodal-line superconductors.

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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