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arXiv 1906.02799cond-mat.supr-con
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200 K超导体中的强粒子-空穴对称性破缺

Strong Particle-Hole Symmetry Breaking in a 200 kelvin Superconductor

Soham S. Ghosh, Yundi Quan, Warren E. Pickett

摘要:

金属的超导状态长期以来一直是低能下粒子-空穴对称性(PHS)的经典例子。基于第一性原理计算的H $_3$ S中电子-声子耦合的费米自能结果表明,由于费米态密度的尖锐结构而引起的强的PHS破缺动力学.因此,H $_3$ S不仅是具有最高临界温度$T_c$(到2018年)的超导体,而且其低能,低温特性与教科书行为严重偏离。次要的动量和能带依赖的费米子自能允许评估的动量分辨和区域平均的谱密度和相互作用的热分布函数,所有这些都清楚地说明了强粒子-空穴不对称性。

英文摘要:

The superconducting state of metals has long provided a classic example of particle-hole symmetry (PHS) at low energy. Fermionic self-energy results based on first principles theory for the electron-phonon coupling in H$_3$S presented here illustrate strong PHS-breaking dynamics arising from the underlying sharp structure in the fermionic density of states. Thus H$_3$S is not only the superconductor with the highest critical temperature $T_c$ (through 2018), but its low energy, low temperature properties deviate strongly from textbook behavior. The minor momentum and band dependence of the fermionic self-energy allows evaluation of the momentum-resolved and zone-averaged spectral densities and interacting thermal distribution function, all of which clearly illustrate strong particle-hole asymmetry.

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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