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Condensed Matter / Biophysics Seminars: Yiming Wu (Stanford)
Mechanism of pair-density-wave from electron repulsion
While uniform superconductivity has been observed in many materials, that with finite center-of-mass momentum pairing, also known as pair-density-wave, stays rare in nature. In this talk I will introduce both weak and intermediate coupling theories to explain the underlying mechanism for PDWs from electron repulsion. The weak coupling theory generally involves Fermi surface nesting in the particle-particle channel, while the intermediate coupling theory requires local suppression and is a threshold phenomenon. Typical examples such as moire bilayer systems and Kagome metals will be discussed.