Coulomb Blockade and Bloch Oscillations in Superconducting Ti Nanowires

J. S. Lehtinen, K. Zakharov, K. Yu Arutyunov (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Quantum fluctuations in quasi-one-dimensional superconducting channels leading to spontaneous changes of the phase of the order parameter by 2π, alternatively called quantum phase slips (QPS), manifest themselves as the finite resistance well below the critical temperature of thin superconducting nanowires and the suppression of persistent currents in tiny superconducting nanorings. Here we report the experimental evidence that in a current-biased superconducting nanowire the same QPS process is responsible for the insulating state—the Coulomb blockade. When exposed to rf radiation, the internal Bloch oscillations can be synchronized with the external rf drive leading to formation of quantized current steps on the I−V characteristic. The effects originate from the fundamental quantum duality of a Josephson junction and a superconducting nanowire governed by QPS—the QPS junction.
Original languageEnglish
Article number187001
JournalPhysical Review Letters
Volume109
DOIs
Publication statusPublished - Oct 2012
MoE publication typeA1 Journal article-refereed

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nanowires
slip
oscillations
Josephson junctions
critical temperature
retarding
radiation

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Coulomb Blockade and Bloch Oscillations in Superconducting Ti Nanowires. / Lehtinen, J. S.; Zakharov, K.; Arutyunov, K. Yu (Corresponding Author).

In: Physical Review Letters, Vol. 109, 187001, 10.2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Coulomb Blockade and Bloch Oscillations in Superconducting Ti Nanowires

AU - Lehtinen, J. S.

AU - Zakharov, K.

AU - Arutyunov, K. Yu

PY - 2012/10

Y1 - 2012/10

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AB - Quantum fluctuations in quasi-one-dimensional superconducting channels leading to spontaneous changes of the phase of the order parameter by 2π, alternatively called quantum phase slips (QPS), manifest themselves as the finite resistance well below the critical temperature of thin superconducting nanowires and the suppression of persistent currents in tiny superconducting nanorings. Here we report the experimental evidence that in a current-biased superconducting nanowire the same QPS process is responsible for the insulating state—the Coulomb blockade. When exposed to rf radiation, the internal Bloch oscillations can be synchronized with the external rf drive leading to formation of quantized current steps on the I−V characteristic. The effects originate from the fundamental quantum duality of a Josephson junction and a superconducting nanowire governed by QPS—the QPS junction.

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DO - 10.1103/physrevlett.109.187001

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