Effect of thermal noise on current-voltage characteristics of Josephson junctions

Charles M Falco, W. H. Parker, S. E. Trullinger, Paul K. Hansma

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Measurements are reported of the current-voltage (I-V) characteristics of externally shunted oxide-barrier tunnel junctions at temperatures T and critical currents Ic such that the Josephson coupling energy (2e)Ic is comparable to the thermal energy k T. The measurements are in complete quantitative agreement with the theory of Ambegaokar and Halperin in the limit that the dimensionless parameter βc=(2e) (IcCσ2)1, where C is the capacitance and σ the total conductance of the shunted junction. Measurements for larger values of βc are in qualitative agreement with the theory of Kurkijärvi and Ambegaokar. In addition, the Ambegaokar-Halperin theory is generalized to include the cos pair-quasiparticle interference term. It is concluded that a measurement of the cos term using only the I-V characteristic will be difficult.

Original languageEnglish (US)
Pages (from-to)1865-1873
Number of pages9
JournalPhysical Review B
Volume10
Issue number5
DOIs
StatePublished - 1974
Externally publishedYes

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Thermal noise
thermal noise
Current voltage characteristics
Josephson junctions
electric potential
Tunnel junctions
Critical currents
Thermal energy
thermal energy
tunnel junctions
Oxides
critical current
Capacitance
capacitance
interference
oxides
Electric potential
Temperature
temperature
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effect of thermal noise on current-voltage characteristics of Josephson junctions. / Falco, Charles M; Parker, W. H.; Trullinger, S. E.; Hansma, Paul K.

In: Physical Review B, Vol. 10, No. 5, 1974, p. 1865-1873.

Research output: Contribution to journalArticle

Falco, Charles M ; Parker, W. H. ; Trullinger, S. E. ; Hansma, Paul K. / Effect of thermal noise on current-voltage characteristics of Josephson junctions. In: Physical Review B. 1974 ; Vol. 10, No. 5. pp. 1865-1873.
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