Light induced enhancement of superconductivity via melting of competing bond-density wave order in underdoped cuprates
11:00 - 12:00
CFEL (Bldg. 99)
Seminar Room III, EG.080
Michael Sentef / Angel Rubio
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 wavevectors, leading to a strong softening of phonons at these wavevectors. For a model of classical phonons with anharmonic couplings, we show that thecombination 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.
A. A. Patel and A. Eberlein, Phys. Rev. B 93, 195139 (2016)