Collective modes in disordered s-wave superconductors

ORAL

Abstract

We investigate the effect of disorder and temperature on the two particle spectral function for s-wave superconductors, focusing on the evolution of the low energy collective Higgs and phase modes. We find that disorder creates a subgap Higgs mode and flattens the Goldstone mode. In the presence of weak disorder, the Higgs mode remains spectrally separated from phase modes for a large range of temperature, thereby making it a possible candidate to observe in energy resolved spectroscopies.

*N.T. acknowledges support from DOE grant DE-FG02-07ER46423.

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Presenters

  • Abhisek Samanta

    • Physics, Technion

Authors

  • Abhisek Samanta

    • Physics, Technion

  • Anirban Das

    • Physics, Tata Institute of Fundamental Research

  • Nandini Trivedi

    • Ohio State Univ - Columbus
    • The Ohio State University
    • Physics, The Ohio State University
    • Department of Physics, Ohio State Univ - Columbus

  • Rajdeep Sensarma

    • Physics, Tata Institute of Fundamental Research
    • Department of Theoretical Physics, Tata Institute of Fundamental Research (TIFR)
    • Tata Institute of Fundamental Research (TIFR)
    • Department of Theoretical Physics, Tata Institute of Fundamental Research