Environment-assisted tunneling as an origin of the Dynes density of states

J.P. Pekola, Ville Maisi, Sergey Kafanov, Nikolai Chekurov, A. Kemppinen, Yu.A. Pashkin, O.-P. Saira, M. Möttönen, J.S. Tsai

Research output: Contribution to journalArticleScientificpeer-review

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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.
Original languageEnglish
Article number026803
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume105
Issue number2
DOIs
Publication statusPublished - 6 Jul 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • Dynes density of states
  • Single-electron tunneling
  • Superconductivity

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