论文标题
nemato弹性量子临界点附近的超导性
Superconductivity near a nematoelastic quantum critical point
论文作者
论文摘要
我们研究了二维金属系统的配对不稳定性，该系统是在存在不可避免的相关耦合的情况下，是由nematic阶参数与晶格的弹性模式（声音声子）的不可避免的相关耦合所引起的。我们发现，这种Nematoalastic耦合$λ_\ Mathrm {latt} $都会减少超导（SC）临界温度$ T_C $和GAP函数$δ$，无论差距对称性如何。有趣的是，我们表明$λ_\ mathrm {latt} $提供了一个旋钮，使我们能够在低温下研究SC相的出现，这是从非芬特液体或费米液体正常状态的不稳定性。 SC和这些正常状态之间的相变为不同的临界指数，每个差距对称性也可能有所不同。最后，我们认为这些结果可能解释了$ t_c $在化合物FESE $ _ {1- x} $ s $ _x $附近的附近的依赖性。
We study the pairing instability of a two-dimensional metallic system induced by Ising-nematic quantum fluctuations in the presence of an unavoidable relevant coupling of the nematic order parameter to the elastic modes (acoustic phonons) of the lattice. We find that this nematoelastic coupling $λ_\mathrm{latt}$ leads to a decrease of both the superconducting (SC) critical temperature $T_c$ and the gap function $Δ$, regardless of the gap symmetry. Interestingly, we show that $λ_\mathrm{latt}$ provides a knob that allows us to investigate the emergence of the SC phase at low temperatures, as an instability from either a non-Fermi liquid or a Fermi liquid normal state. The phase transitions between the SC and these normal states are characterized by different critical exponents, which may also vary for each gap symmetry. Finally, we argue that these results might explain the dependence of $T_c$ in the vicinity of the nematic quantum critical point exhibited by the compound FeSe$_{1 - x}$S$_x$.
