Light-induced enhancement of superconductivity via melting of competing bond-density wave order in underdoped cuprates | |
Article | |
关键词: FERMI LIQUIDS; CHARGE ORDER; FLUCTUATIONS; SYMMETRY; DRIVEN; | |
DOI : 10.1103/PhysRevB.93.195139 | |
来源: SCIE |
【 摘 要 】
We develop a theory for light-induced superconductivity in underdoped cuprates in which the competing bond-density wave order is suppressed by driving phonons with light. Close to a bond-density wave instability in a system with a small Fermi surface, such as a fractionalized Fermi liquid, we show that the coupling of electrons to phonons is strongly enhanced at the bond-density wave ordering wave vectors, leading to a strong softening of phonons at these wave vectors. For a model of classical phonons with anharmonic couplings, we show that the combination of strong softening and driving can lead to large phonon oscillations. When coupled to a phenomenological model describing the competition between bond-density wave order and superconductivity, these phonon oscillations melt bond-density wave order, thereby enhancing pairing correlations.
【 授权许可】
Free