Light-induced enhancement of superconductivity via melting of competing bond-density wave order in underdoped cuprates

Aavishkar A. Patel; Andreas Eberlein

doi:10.1103/PhysRevB.93.195139

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Light-induced enhancement of superconductivity via melting of competing bond-density wave order in underdoped cuprates

Aavishkar A. Patel, Andreas Eberlein

DOI 10.1103/PhysRevB.93.195139 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown