论文标题
通过Floquet交互工程进行光学诱导的拓扑超导性
Optically induced topological superconductivity via Floquet interaction engineering
论文作者
论文摘要
我们提出了一种在具有巨大的迪拉克型带结构的两谷半导体中光诱导的非常规超导性的机制。超导阶段是由于在库仑排斥的存在下对载体的过平衡激发而产生的，并通过将驱动的半导体与骨气或费米子热浴耦合来稳定。我们考虑了一个圆形的轻泵，并表明，通过控制泵频率相对于带隙的失沟，将诱导不同类型的手性超导性。新型超导状态的出现，例如手性$ p $波配对，是由互动的浮雕工程产生的。通过将库仑相互作用的形式投影到与泵频率共振的状态中，可以通过修改库仑相互作用的形式来实现这一点。我们表明，系统中所得的非常规配对可以托管受拓扑保护的手性结合状态。我们讨论了一个有希望的实验平台，以实现我们的建议并检测出紧急状态的签名。
We propose a mechanism for light-induced unconventional superconductivity in a two-valley semiconductor with a massive Dirac type band structure. The superconducting phase results from the out-of-equilibrium excitation of carriers in the presence of Coulomb repulsion and is stabilized by coupling the driven semiconductor to a bosonic or fermionic thermal bath. We consider a circularly-polarized light pump and show that by controlling the detuning of the pump frequency relative to the band gap, different types of chiral superconductivity would be induced. The emergence of novel superconducting states, such as the chiral $p$-wave pairing, results from the Floquet engineering of the interaction. This is realized by modifying the form of the Coulomb interaction by projecting it into the states that are resonant with the pump frequency. We show that the resulting unconventional pairing in our system can host topologically protected chiral bound states. We discuss a promising experimental platform to realize our proposal and detect the signatures of the emergent superconducting state.
