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arXiv 2005.05987cond-mat.supr-concond-mat.quant-gascond-mat.str-el
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泡利极限d波超导体:量子破坏对相变和热相变

Pauli limited d-wave superconductors: Quantum breached pair phase and thermal transitions

Madhuparna Karmakar

摘要:

报道了泡利极限$d$波超导体的量子相变,并给出了相应量子临界点的平均场估计。对于粒子数不平衡的$d$波超导体,我们发现了一个稳定的基态相,即量子破缺对相,它由无带隙超导和非零磁化空间共存组成。基于热力学和准粒子指标,我们首次分析了这一相,讨论了泡利极限$d$波超导体的热行为,给出了这类系统的热标度的精确估计,并绘制出了赝能隙区。我们的工作表明,虽然泡利有限的超导体被称为表现出异国情调的调制超导相位在大的不平衡的费米子人口,在政权的弱不平衡的竞争秩序的一个有趣的阶段实现。我们已经确定,量子相变不是由超导配对场来量化的,而是系统的平均磁化强度。鉴于现有的泡利极限超导体具有超导序的非常规配对态对称性,我们的工作有望在这些材料的实验研究中开辟新的途径。我们还证明了另一种情况下,量子破坏对相位是一个自然的结果,$d$波超导体与不等的有效质量的费米子物种。

英文摘要:

We report a quantum phase transition in Pauli limited $d$-wave superconductors and give the mean field estimates of the associated quantum critical point. For a population imbalanced $d$-wave superconductor a stable ground state phase viz. quantum breached pair phase has been identified which comprises of spatial coexistence of gapless superconductivity and nonzero magnetization. Based on the thermodynamic and quasiparticle indicators we for the first time analyze this phase, discuss the thermal behavior of Pauli limited $d$-wave superconductor, give accurate estimates of the thermal scales associated with such systems and map out the pseudogap regime. Our work shows that while the Pauli limited superconductors are known to exhibit exotic modulated superconducting phase at large imbalance of fermion populations; in the regime of weak imbalance an intriguing phase of competing orders is realized. We have established that rather than the superconducting pairing field, it is the average magnetization of the system that quantifies this quantum phase transition. Given that the existing Pauli limited superconductors possess unconventional pairing state symmetry of the superconducting order, our work promises to open up new avenues in the experimental research of these materials. We have also demonstrated an alternate scenario wherein the quantum breached pair phase is a natural outcome for a $d$-wave superconductor with unequal effective masses of the fermion species.

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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