论文标题
狄拉克半径超导体异质结中特殊点及其光谱签名的出现
Emergence of exceptional points and their spectroscopic signature in Dirac semimetal-dirty Superconductor heterojunction
论文作者
论文摘要
从理论上讲，我们在II型DIRAC半金属（DSM）和肮脏的超导体（DSC）的异质结处进行了非炎症物理学的出现。通过超导材料的肮脏性，通过DSM中引入了非热性。这导致有效的哈密顿量的光谱变得复杂，这引起了特殊点（EPS）的外观。除了具有频率依赖性之外，这种复杂的自能量也获得了空间依赖性，这是独特的，并且可以在光谱函数分析中提供与非热物理学有关的有趣效果。在距离DSC的正常金属 - 螺旋体连接处的适当距离处，出现了非铁元素，一个dirac点分为两个EPS。在光谱函数分析中，除了EPS外，还出现了Fermi-Arc结构，它连接了两个归化性（EPS）。这里讨论的结果是独特的，可以在光谱测量中实现。
We theoretically investigate the emergence of non-hermitian physics at the heterojunction of a type-II Dirac semi-metal (DSM) and a dirty superconductor (DSC). The non-hermiticity is introduced in the DSM through the self-energy term incorporated via the dirtiness of the superconducting material. This causes the spectra of the effective Hamiltonian to become complex, which gives rise to the appearance of the exceptional points (EPs). This complex self energy, apart from having a frequency dependence, also acquires spatial dependence as well, which is unique and can provide interesting effects related to non-hermitian physics in spectral function analysis. At an appropriate distance from the normal metal-superconductor junction of the DSC, non-hermitian degeneracies appear and a single Dirac point splits into two EPs. In the spectral function analysis, apart from the EPs, a Fermi-arc like structure also emerges, which connects the two degeneracies (EPs). The results discussed here are distinctive and possibly can be realized in spectroscopy measurements.
