Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
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DOI：
10.1103/physrevb.98.235120
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发表时间：
2018-06
影响因子：
3.7
通讯作者：
K. Ishigaki;J. Nasu;A. Koga;S. Hoshino;P. Werner
中科院分区：
文献类型：
--
作者：
K. Ishigaki;J. Nasu;A. Koga;S. Hoshino;P. Werner
结合动力学平均场理论和连续时间量子蒙特卡罗模拟，研究了无限维中具有负Hund耦合的三轨道Hubbard模型。这个模型，这是相关的碱金属掺杂的富勒烯的描述，先前已被证明表现出自发的轨道选择性莫特相附近的超导相。通过计算各轨道上的对势和双占有率，研究了不同均匀有序态之间的竞争，确定了相应的有限温度相图。我们确定了两种不同类型的自发轨道选择性的莫特态，并表明，一个轨道选择性的$s $波超导态与一个超导和两个金属轨道之间的传统的$s$波超导相和这两种自发轨道选择性的莫特态自发实现。
We study a three-orbital Hubbard model with negative Hund coupling in infinite dimensions, combining dynamical mean-field theory with continuous time quantum Monte Carlo simulations. This model, which is relevant for the description of alkali-doped fullerides, has previously been shown to exhibit a spontaneous orbital selective Mott phase in the vicinity of the superconducting phase. Calculating the pair potential and double occupancy in each orbital, we study the competition between different homogeneous ordered states and determine the corresponding finite temperature phase diagram of the model. We identify two distinct types of spontaneous orbital-selective Mott states and show that an orbital-selective $s$-wave superconducting state with one superconducting and two metallic orbitals is spontaneously realized between the conventional $s$-wave superconducting phase and these two kinds of spontaneously orbital-selective Mott states.