Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi

Junseong Song; Sunghun Kim; Youngkuk Kim; Huixia Fu; Jahyun Koo; Zhen Wang; Gyubin Lee; Jouhahn Lee; Sang Ho Oh; Joonho Bang; Taku Matsushita; Nobuo Wada; Hiroki Ikegami; Jonathan D. Denlinger; Young Hee Lee; Binghai Yan; Yeongkwan Kim; Sung Wng Kim

doi:10.1103/PhysRevX.11.021065

Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi

Junseong Song, Sunghun Kim, Youngkuk Kim, Huixia Fu, Jahyun Koo, Zhen Wang, Gyubin Lee, Jouhahn Lee, Sang Ho Oh, Joonho Bang, Taku Matsushita, Nobuo Wada, Hiroki Ikegami, Jonathan D. Denlinger, Young Hee Lee, Binghai Yan, Yeongkwan Kim, Sung Wng Kim

Physics

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with a naturally formed superconducting state on the surface under ambient pressure. Using photoemission spectroscopy together with first-principles calculations, a 3D Dirac state with linear band dispersion is identified. The characteristic features of massless Dirac fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass of m∗=0.012 m0 and a high Fermi velocity of vF=1.04×106 m/s. Interestingly, superconductivity occurs below 0.85 K on the (001) surface, while the bulk remains nonsuperconducting. The captured linear temperature dependence of the upper critical field suggests the possible non-s-wave character of this surface superconductivity. Our discovery serves a distinctive platform to study the interplay between 3D TDS and the superconductivity.

Original language	English (US)
Article number	021065
Journal	Physical Review X
Volume	11
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevX.11.021065
State	Published - Jun 2021

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevX.11.021065

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Song, J., Kim, S., Kim, Y., Fu, H., Koo, J., Wang, Z., Lee, G., Lee, J., Oh, S. H., Bang, J., Matsushita, T., Wada, N., Ikegami, H., Denlinger, J. D., Lee, Y. H., Yan, B., Kim, Y., & Kim, S. W. (2021). Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi. Physical Review X, 11(2), Article 021065. https://doi.org/10.1103/PhysRevX.11.021065

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title = "Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi",

abstract = "We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with a naturally formed superconducting state on the surface under ambient pressure. Using photoemission spectroscopy together with first-principles calculations, a 3D Dirac state with linear band dispersion is identified. The characteristic features of massless Dirac fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass of m∗=0.012 m0 and a high Fermi velocity of vF=1.04×106 m/s. Interestingly, superconductivity occurs below 0.85 K on the (001) surface, while the bulk remains nonsuperconducting. The captured linear temperature dependence of the upper critical field suggests the possible non-s-wave character of this surface superconductivity. Our discovery serves a distinctive platform to study the interplay between 3D TDS and the superconductivity.",

author = "Junseong Song and Sunghun Kim and Youngkuk Kim and Huixia Fu and Jahyun Koo and Zhen Wang and Gyubin Lee and Jouhahn Lee and Oh, {Sang Ho} and Joonho Bang and Taku Matsushita and Nobuo Wada and Hiroki Ikegami and Denlinger, {Jonathan D.} and Lee, {Young Hee} and Binghai Yan and Yeongkwan Kim and Kim, {Sung Wng}",

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month = jun,

doi = "10.1103/PhysRevX.11.021065",

language = "English (US)",

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AU - Song, Junseong

AU - Kim, Sunghun

AU - Kim, Youngkuk

AU - Fu, Huixia

AU - Koo, Jahyun

AU - Wang, Zhen

AU - Lee, Gyubin

AU - Lee, Jouhahn

AU - Oh, Sang Ho

AU - Bang, Joonho

AU - Matsushita, Taku

AU - Wada, Nobuo

AU - Ikegami, Hiroki

AU - Denlinger, Jonathan D.

AU - Lee, Young Hee

AU - Yan, Binghai

AU - Kim, Yeongkwan

AU - Kim, Sung Wng

PY - 2021/6

Y1 - 2021/6

N2 - We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with a naturally formed superconducting state on the surface under ambient pressure. Using photoemission spectroscopy together with first-principles calculations, a 3D Dirac state with linear band dispersion is identified. The characteristic features of massless Dirac fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass of m∗=0.012 m0 and a high Fermi velocity of vF=1.04×106 m/s. Interestingly, superconductivity occurs below 0.85 K on the (001) surface, while the bulk remains nonsuperconducting. The captured linear temperature dependence of the upper critical field suggests the possible non-s-wave character of this surface superconductivity. Our discovery serves a distinctive platform to study the interplay between 3D TDS and the superconductivity.

AB - We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with a naturally formed superconducting state on the surface under ambient pressure. Using photoemission spectroscopy together with first-principles calculations, a 3D Dirac state with linear band dispersion is identified. The characteristic features of massless Dirac fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass of m∗=0.012 m0 and a high Fermi velocity of vF=1.04×106 m/s. Interestingly, superconductivity occurs below 0.85 K on the (001) surface, while the bulk remains nonsuperconducting. The captured linear temperature dependence of the upper critical field suggests the possible non-s-wave character of this surface superconductivity. Our discovery serves a distinctive platform to study the interplay between 3D TDS and the superconductivity.

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Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi

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