论文标题
配对密度波和嵌套费米表面之间的相互作用
Interplay between Pair Density Wave and a Nested Fermi Surface
论文作者
论文摘要
我们表明，自然的时间反向对称（TRS）破裂自然可能是由于对在多个动量和嵌套费米表面（FS）嵌套之间的相互作用（PDW）之间的相互作用。具体而言，我们考虑在嵌套FS的六角形晶格上以$ 3/4 $ $的电子填充，这与最近发现的超导体CSV $ _3 $ _3 $ SB $ _5 $有关。由于FS的嵌套，FS上的每个动量$ \ bk $都至少有两个$ - \ bk \ bk \ pm \ pm \ mathbf {q}_α$（$α= 1,2,3 $）在FS上形成有限动量（$ \ pm pm \ pm \ pm \ mathbf {q}_α$）coopers and trs and pd and pd and pd and pd and pd and pd and pd a in at in trs and in at in at in at in at y in at ra Bogoliubov Fermi口袋。已经研究了各种光谱，包括（局部）密度，电子光谱功能和准粒子干扰的影响。 PDW的部分熔化将产生$ 4 \ times {} 4 $和$ \ frac {4} {\ sqrt {3}} \ times \ times \ frac {4} {\ sqrt {\ sqrt {3}} $ cdw订单，此外，除了$ 2 \ tise 2 $ cdw。进一步讨论了对CSV $ _3 $ SB $ _5 $和未来实验等真实材料的可能影响。
We show that spontaneous time-reversal-symmetry (TRS) breaking can naturally arise from the interplay between pair density wave (PDW) ordering at multiple momenta and nesting of Fermi surfaces (FS). Concretely, we consider pair-density-wave superconductivity on a hexagonal lattice with nested FS at $3/4$ electron filling, which is related to a recently discovered superconductor CsV$_3$Sb$_5$. Because of nesting of the FS, each momentum $\bk$ on the FS has at least two counterparts $-\bk\pm\mathbf{Q}_α$ ($α=1,2,3$) on the FS to form finite momentum ($\pm\mathbf{Q}_α$) Cooper pairs, resulting in a TRS and inversion broken PDW state with stable Bogoliubov Fermi pockets. Various spectra, including (local) density of states, electron spectral function and the effect of quasi-particle interference, have been investigated. The partial melting of the PDW will give rise to $4\times{}4$ and $\frac{4}{\sqrt{3}}\times\frac{4}{\sqrt{3}}$ CDW orders, in addition to the $2\times2$ CDW. Possible implications to real materials such as CsV$_3$Sb$_5$ and future experiments have been further discussed.
