Hybridization of Bogoliubov quasiparticles between adjacent CuO2 layers in the triple-layer cuprate Bi2Sr2Ca2Cu3O10+δ studied by angle-resolved photoemission spectroscopy
Hybridization of Bogoliubov quasiparticles between adjacent CuO2 layers in the triple-layer cuprate Bi2Sr2Ca2Cu3O10+δ studied by angle-resolved photoemission spectroscopy
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通过角分辨光电子能谱研究三层铜酸盐 Bi2Sr2Ca2Cu3O10+δ 中相邻 CuO2 层之间 Bogoliubov 准粒子的杂化
DOI：
10.1103/physrevlett.127.217004
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发表时间：
2021
影响因子：
8.6
通讯作者：
Fujimori A.
中科院分区：
文献类型：
--
作者：
Ideta S.;Johnston S.;Yoshida T.;Tanaka K.;Mori M.;Anzai H.;Ino A.;Arita M.;Namatame H.;Taniguchi M.;Ishida S.;Takashima K.;Kojima K.?M.;Devereaux T.?P.;Uchida S.;Fujimori A.
用角分辨光发射光谱（ARPES）研究了三层铜高温超导体层间Bogoliubov准粒子（BQPs）的杂化。在超导状态下，外层和内部bqp带之间打开了一个反交叉间隙，我们将其主要归因于层间单粒子跳变，层间库珀配对可能也有贡献。与先前的ARPES研究相比，我们发现两个BQP带的波超导间隙随动量平稳发展而没有突然跳跃。BQPs之间的杂化也逐渐增加，从离节区到反节区，这可以用层间单粒子跳变的动量依赖来解释。讨论了BQPs之间的杂化、三层声子模式的结合以及四阱模型所表示的自旋涨落，作为超导转变温度提高的可能机制。
Hybridization of Bogoliubov quasiparticles (BQPs) between thelayers in the triple-layer cuprate high-temperature superconductoris studied by angle-resolved photoemission spectroscopy (ARPES). In the superconducting state, an anticrossing gap opens between the outer- and inner-BQP bands, which we attribute primarily to interlayer single-particle hopping with possible contributions from interlayer Cooper pairing. We find that the-wave superconducting gap of both BQP bands smoothly develops with momentum without an abrupt jump in contrast to a previous ARPES study. Hybridization between the BQPs also gradually increases in going from the off nodal to the antinodal region, which is explained by the momentum dependence of the interlayer single-particle hopping. As possible mechanisms for the enhancement of the superconducting transition temperature, the hybridization between the BQPs as well as the combination of phonon modes of the triplelayers and spin fluctuations represented by a four-well model are discussed.