The Higgs mode in disordered superconductors close to a quantum phase transition

Daniel Sherman, Uwe S. Pracht, Boris Gorshunov, Shachaf Poran, John Jesudasan, Madhavi Chand, Pratap Raychaudhuri, Mason Swanson, Nandini Trivedi, Assa Auerbach, Marc Scheffler, Aviad Frydman, Martin Dressel

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

The concept of mass generation by means of the Higgs mechanism was strongly inspired by earlier works on the Meissner-Ochsenfeld effect in superconductors. In quantum field theory, the excitations of longitudinal components of the Higgs field manifest as massive Higgs bosons. The analogous Higgs mode in superconductors has not yet been observed owing to its rapid decay into particle-hole pairs. According to recent theories, however, the Higgs mode should decrease below the superconducting pairing gap 2Δ and become visible in two-dimensional systems close to the superconductor-insulator transition. For experimental verification, we measured the complex terahertz transmission and tunnelling density of states of various thin films of superconducting NbN and InO close to criticality. Comparing both techniques reveals a growing discrepancy between the finite 2Δ and the threshold energy for electromagnetic absorption, which vanishes critically towards the superconductor-insulator transition. We identify the excess absorption below 2Δ as strong evidence of the Higgs mode in two-dimensional quantum critical superconductors.

Original languageEnglish
Pages (from-to)188-192
Number of pages5
JournalNature Physics
Volume11
Issue number2
DOIs
StatePublished - 1 Jan 2015

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© 2015 Macmillan Publishers Limited.

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