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Environment-Assisted Tunneling as an Origin of the Dynes Density of States

Research output: Contribution to journalJournal article

Published

  • J. P. Pekola
  • V. F. Maisi
  • S. Kafanov
  • N. Chekurov
  • A. Kemppinen
  • Yuri Pashkin
  • O. -P. Saira
  • M. Mottonen
  • J. S. Tsai
Article number026803
Journal publication date6/07/2010
JournalPhysical review letters
Journal number2
Volume105
Number of pages4
Pages-
Original languageEnglish

Abstract

We show that the effect of a high-temperature environment in current transport through a normal metal-insulator-superconductor tunnel junction can be described by an effective density of states in the superconductor. In the limit of a resistive low-Ohmic environment, this density of states reduces into the well-known Dynes form. Our theoretical result is supported by experiments in engineered environments. We apply our findings to improve the performance of a single-electron turnstile, a potential candidate for a metrological current source.