title: Proposed parametric cooling of bilayer cuprate superconductors by terahertz excitation.
abstract: We propose and analyze a scheme for parametrically cooling bilayer cuprates based on the selective driving of a c-axis vibrational mode. The scheme exploits the vibration as a transducer making the Josephson plasma frequencies time dependent. We show how modulation at the difference frequency between the intrabilayer and interbilayer plasmon substantially suppresses interbilayer phase fluctuations, responsible for switching c-axis transport from a superconducting to a resistive state. Our calculations indicate that this may provide a viable mechanism for stabilizing nonequilibrium superconductivity even above Tc, provided a finite pair density survives between the bilayers out of equilibrium.
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: S J
authors.initials: SJ
authors.lastname: Denny
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.|Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany.
authors.forename: S R
authors.initials: SR
authors.lastname: Clark
authors.affiliation: Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Laplace
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.|Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Cavalleri
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.|Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: D
authors.initials: D
authors.lastname: Jaksch