Light-induced topological superconductivity via Floquet interaction engineering
Light-induced topological superconductivity via Floquet interaction engineering
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DOI：
10.1103/physrevresearch.3.023039
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发表时间：
2021-04-13
影响因子：
4.2
通讯作者：
Ghaemi, Pouyan
中科院分区：
文献类型：
--
作者：
Dehghani, Hossein;Hafezi, Mohammad;Ghaemi, Pouyan
我们提出了一个机制，光诱导的非常规超导电性的双谷半导体与一个巨大的Dirac-type带结构。超导相是在库仑排斥的存在下由载流子的非平衡激发产生的，并且通过将被驱动的半导体耦合到玻色子或费米子热浴来稳定。我们考虑了一个圆偏振光泵浦，并表明，通过控制相对于带隙的泵浦频率的失谐，不同类型的手征超导性将被诱导。新的超导态的出现，如手征p波配对，是相互作用的Floquet工程的结果。这是通过将库仑相互作用投射到与泵浦频率共振的状态来修改库仑相互作用的形式来实现的。我们表明，由此产生的非常规配对在我们的系统中可以主机拓扑保护的手性束缚态。我们讨论了一个有前途的实验平台，以实现我们的建议，并检测紧急超导状态的签名。
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.