Singlet Even-Frequency and Triplet Odd-Frequency Superconductivity in the Two-Band Hubbard Model Based on the Dynamical Mean-Field Theory

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Journal of the Physical Society of Japan Pub Date : 2024-03-04 DOI:10.7566/jpsj.93.043701

Yusuke Inokuma, Yoshiaki Ōno

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Abstract

Superconductivity in the two-band Hubbard model characterized by the on-site Coulomb repulsion U_d at d-site and the charge-transfer energy Δ between d- and p-sites is investigated on the basis of the dynamical mean-field theory. We calculate the pair susceptibilities for the s-wave symmetries with spin-singlet even-frequency and spin-triplet odd-frequency pairings and determine the superconducting transition temperature T_c at which the pair susceptibilities diverge. In the strong correlation regime where the system becomes Mott insulator at half-filling, the triplet superconductivity takes place in underdoped region while the singlet one takes place in overdoped region. In the both cases, T_c shows a maximum in the crossover region between Mott–Hubbard type (U_d < Δ) and charge-transfer type (U_d > Δ). We also observe a remarkable BEC-BCS crossover at a slightly doped region in the triplet superconductivity.

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基于动态均场理论的双波段哈伯模型中的单子偶频和三子奇频超导现象

我们以动态均场理论为基础，研究了双带哈伯德模型中的超导性，其特征是 d 位的现场库仑斥力 Ud 以及 d 位和 p 位之间的电荷转移能 Δ。我们计算了具有自旋-小偶频和自旋-三偶频配对的 s 波对称性的配对感生，并确定了配对感生发散时的超导转变温度 Tc。在半填充时系统成为莫特绝缘体的强相关体系中，三重超导发生在掺杂不足区域，而单重超导发生在掺杂过度区域。在这两种情况下，Tc 在莫特哈伯德型（Ud < Δ）和电荷转移型（Ud > Δ）之间的交叉区域都显示出最大值。我们还在三重超导的轻微掺杂区域观察到了显著的 BEC-BCS 交叉。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Physical Society of Japan 物理-物理：综合

CiteScore

3.40

自引率

17.60%

发文量

325

审稿时长

3 months

期刊介绍： The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below. Subjects Covered JPSJ covers all the fields of physics including (but not restricted to) Elementary particles and fields Nuclear physics Atomic and Molecular Physics Fluid Dynamics Plasma physics Physics of Condensed Matter Metal, Superconductor, Semiconductor, Magnetic Materials, Dielectric Materials Physics of Nanoscale Materials Optics and Quantum Electronics Physics of Complex Systems Mathematical Physics Chemical physics Biophysics Geophysics Astrophysics.