Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.9: Talk

Thursday, March 15, 2018, 11:45–12:00, HFT-FT 101

Pair density waves from coexistence: properties and experimental signatures — •Pavel A. Volkov¹, Mikhail Malakhov², and Konstantin B. Efetov^1,3 — ¹Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ²Institute of Physics, Kazan (Volga Region) Federal University, 420008 Kazan, Russian Federation — ³National University of Science and Technology MISiS, 119049 Moscow, Russian Federation

Pair density wave (PDW) is a state of matter where the amplitude of superconducting pairing oscillates in space. One of the cases where PDW is expected to arise is in a system where uniform superconductivity coexists with a charge density wave. This situation is realized in underdoped cuprates, where PDW has been recently discovered in a scanning Josephson tunneling microscopy (SJTM) experiment [1]. In this regard, we consider a mean-field model with the Gor’kov formalism to study the structure of the PDW. We find that the PDW amplitude has an intricate momentum dependence that bears information about the order parameters as well as the underlying Fermi surface. We also consider the implications of our results for the SJTM experiments and discuss applications to other materials where coexistence of superconductivity and charge density waves has been reported.
M. H. Hamidian et al., Nature 532, 343 (2016).