4π-Periodic Supercurrent from Surface States in Cd3As2 Nanowire-Based Josephson Junctions

An-Qi Wang, Caizhen Li, Chuan Li, Zhi Min Liao, Alexander Brinkman, Da Peng Yu

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Abstract

The combination of superconductivity and surface states in Dirac semimetal can produce a 4π-periodic supercurrent in a Josephson junction configuration, which can be revealed by the missing of odd Shapiro steps (especially the n=1 step). However, the suppression of the n=1 step is also anticipated in the high-power oscillatory regime of the ordinary 2π-periodic Josephson effect, which is irrelevant to the 4π-periodic supercurrent. Here, in order to identify the origin of the suppressed n=1 step, we perform the measurements of radio frequency irradiation on Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions with continuous power dependence at various frequencies. Besides the n=1 step suppression, we uncover a residual supercurrent of first node at the n=0 step, which provides a direct and predominant signature of the 4π-periodic supercurrent. Furthermore, by tuning the gate voltage, we can modulate the surface and bulk state contribution and the visibility of the n=1 step. Our results provide deep insights to explore the topological superconductivity in Dirac semimetals.

Original languageEnglish
Article number237701
Pages (from-to)237701-1 - 237701-5
Number of pages5
JournalPhysical review letters
Volume121
Issue number23
DOIs
Publication statusPublished - 7 Dec 2018

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Josephson junctions
nanowires
metalloids
superconductivity
retarding
Josephson effect
visibility
radio frequencies
tuning
signatures
irradiation
electric potential
configurations

Cite this

Wang, An-Qi ; Li, Caizhen ; Li, Chuan ; Liao, Zhi Min ; Brinkman, Alexander ; Yu, Da Peng. / 4π-Periodic Supercurrent from Surface States in Cd3As2 Nanowire-Based Josephson Junctions. In: Physical review letters. 2018 ; Vol. 121, No. 23. pp. 237701-1 - 237701-5.
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title = "4π-Periodic Supercurrent from Surface States in Cd3As2 Nanowire-Based Josephson Junctions",
abstract = "The combination of superconductivity and surface states in Dirac semimetal can produce a 4π-periodic supercurrent in a Josephson junction configuration, which can be revealed by the missing of odd Shapiro steps (especially the n=1 step). However, the suppression of the n=1 step is also anticipated in the high-power oscillatory regime of the ordinary 2π-periodic Josephson effect, which is irrelevant to the 4π-periodic supercurrent. Here, in order to identify the origin of the suppressed n=1 step, we perform the measurements of radio frequency irradiation on Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions with continuous power dependence at various frequencies. Besides the n=1 step suppression, we uncover a residual supercurrent of first node at the n=0 step, which provides a direct and predominant signature of the 4π-periodic supercurrent. Furthermore, by tuning the gate voltage, we can modulate the surface and bulk state contribution and the visibility of the n=1 step. Our results provide deep insights to explore the topological superconductivity in Dirac semimetals.",
author = "An-Qi Wang and Caizhen Li and Chuan Li and Liao, {Zhi Min} and Alexander Brinkman and Yu, {Da Peng}",
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doi = "10.1103/PhysRevLett.121.237701",
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4π-Periodic Supercurrent from Surface States in Cd3As2 Nanowire-Based Josephson Junctions. / Wang, An-Qi; Li, Caizhen ; Li, Chuan ; Liao, Zhi Min; Brinkman, Alexander ; Yu, Da Peng.

In: Physical review letters, Vol. 121, No. 23, 237701, 07.12.2018, p. 237701-1 - 237701-5.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - 4π-Periodic Supercurrent from Surface States in Cd3As2 Nanowire-Based Josephson Junctions

AU - Wang, An-Qi

AU - Li, Caizhen

AU - Li, Chuan

AU - Liao, Zhi Min

AU - Brinkman, Alexander

AU - Yu, Da Peng

PY - 2018/12/7

Y1 - 2018/12/7

N2 - The combination of superconductivity and surface states in Dirac semimetal can produce a 4π-periodic supercurrent in a Josephson junction configuration, which can be revealed by the missing of odd Shapiro steps (especially the n=1 step). However, the suppression of the n=1 step is also anticipated in the high-power oscillatory regime of the ordinary 2π-periodic Josephson effect, which is irrelevant to the 4π-periodic supercurrent. Here, in order to identify the origin of the suppressed n=1 step, we perform the measurements of radio frequency irradiation on Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions with continuous power dependence at various frequencies. Besides the n=1 step suppression, we uncover a residual supercurrent of first node at the n=0 step, which provides a direct and predominant signature of the 4π-periodic supercurrent. Furthermore, by tuning the gate voltage, we can modulate the surface and bulk state contribution and the visibility of the n=1 step. Our results provide deep insights to explore the topological superconductivity in Dirac semimetals.

AB - The combination of superconductivity and surface states in Dirac semimetal can produce a 4π-periodic supercurrent in a Josephson junction configuration, which can be revealed by the missing of odd Shapiro steps (especially the n=1 step). However, the suppression of the n=1 step is also anticipated in the high-power oscillatory regime of the ordinary 2π-periodic Josephson effect, which is irrelevant to the 4π-periodic supercurrent. Here, in order to identify the origin of the suppressed n=1 step, we perform the measurements of radio frequency irradiation on Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions with continuous power dependence at various frequencies. Besides the n=1 step suppression, we uncover a residual supercurrent of first node at the n=0 step, which provides a direct and predominant signature of the 4π-periodic supercurrent. Furthermore, by tuning the gate voltage, we can modulate the surface and bulk state contribution and the visibility of the n=1 step. Our results provide deep insights to explore the topological superconductivity in Dirac semimetals.

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DO - 10.1103/PhysRevLett.121.237701

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