Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system

L. L. Jia; Z. H. Liu; Y. P. Cai; T. Qian; X. P. Wang; H. Miao; P. Richard; Y. G. Zhao; Y. Li; D. M. Wang; J. B. He; M. Shi; G. F. Chen; H. Ding; S. C. Wang

doi:10.1103/PhysRevB.90.035133

Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system

L. L. Jia
, Z. H. Liu
, Y. P. Cai
, T. Qian
, X. P. Wang
, H. Miao
, P. Richard
, Y. G. Zhao
, Y. Li
, D. M. Wang
, J. B. He
, M. Shi
, G. F. Chen
, H. Ding
, S. C. Wang

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

34 Scopus citations

Abstract

We report an observation of a highly anisotropic Dirac-cone structure, and its unconventional electronic behaviors, in high quality SrMnBi2 crystal by angle-resolved photoemission spectroscopy measurement. We observed a well-defined sharp quasiparticle peak in a wide energy range, linearly dispersive, forming a highly anisotropic holelike Dirac cone (vF1/vF2∼5-6). The density of state remains linear, and the scattering rate of the quasiparticle increases linearly as a function of binding energy up to higher binding energy. The results contrast with the expectation for a two-dimensional (2D) or three-dimensional (3D) Fermi-liquid theory and rather suggest the existence of a two-dimensional electron gas system in this 3D material, making SrMnBi2 a potentially useful 2D-electron-gas-encapsulated material.

Original language	English
Article number	035133
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.90.035133
State	Published - Jul 25 2014
Externally published	Yes

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Jia, L. L., Liu, Z. H., Cai, Y. P., Qian, T., Wang, X. P., Miao, H., Richard, P., Zhao, Y. G., Li, Y., Wang, D. M., He, J. B., Shi, M., Chen, G. F., Ding, H., & Wang, S. C. (2014). Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system. Physical Review B - Condensed Matter and Materials Physics, 90(3), Article 035133. https://doi.org/10.1103/PhysRevB.90.035133

@article{4873532858514223b843f375b12d82b0,

title = "Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system",

abstract = "We report an observation of a highly anisotropic Dirac-cone structure, and its unconventional electronic behaviors, in high quality SrMnBi2 crystal by angle-resolved photoemission spectroscopy measurement. We observed a well-defined sharp quasiparticle peak in a wide energy range, linearly dispersive, forming a highly anisotropic holelike Dirac cone (vF1/vF2∼5-6). The density of state remains linear, and the scattering rate of the quasiparticle increases linearly as a function of binding energy up to higher binding energy. The results contrast with the expectation for a two-dimensional (2D) or three-dimensional (3D) Fermi-liquid theory and rather suggest the existence of a two-dimensional electron gas system in this 3D material, making SrMnBi2 a potentially useful 2D-electron-gas-encapsulated material.",

author = "Jia, \{L. L.\} and Liu, \{Z. H.\} and Cai, \{Y. P.\} and T. Qian and Wang, \{X. P.\} and H. Miao and P. Richard and Zhao, \{Y. G.\} and Y. Li and Wang, \{D. M.\} and He, \{J. B.\} and M. Shi and Chen, \{G. F.\} and H. Ding and Wang, \{S. C.\}",

year = "2014",

month = jul,

day = "25",

doi = "10.1103/PhysRevB.90.035133",

language = "English",

volume = "90",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "3",

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Jia, LL, Liu, ZH, Cai, YP, Qian, T, Wang, XP, Miao, H, Richard, P, Zhao, YG, Li, Y, Wang, DM, He, JB, Shi, M, Chen, GF, Ding, H & Wang, SC 2014, 'Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system', Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 3, 035133. https://doi.org/10.1103/PhysRevB.90.035133

TY - JOUR

T1 - Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system

AU - Jia, L. L.

AU - Liu, Z. H.

AU - Cai, Y. P.

AU - Qian, T.

AU - Wang, X. P.

AU - Miao, H.

AU - Richard, P.

AU - Zhao, Y. G.

AU - Li, Y.

AU - Wang, D. M.

AU - He, J. B.

AU - Shi, M.

AU - Chen, G. F.

AU - Ding, H.

AU - Wang, S. C.

PY - 2014/7/25

Y1 - 2014/7/25

N2 - We report an observation of a highly anisotropic Dirac-cone structure, and its unconventional electronic behaviors, in high quality SrMnBi2 crystal by angle-resolved photoemission spectroscopy measurement. We observed a well-defined sharp quasiparticle peak in a wide energy range, linearly dispersive, forming a highly anisotropic holelike Dirac cone (vF1/vF2∼5-6). The density of state remains linear, and the scattering rate of the quasiparticle increases linearly as a function of binding energy up to higher binding energy. The results contrast with the expectation for a two-dimensional (2D) or three-dimensional (3D) Fermi-liquid theory and rather suggest the existence of a two-dimensional electron gas system in this 3D material, making SrMnBi2 a potentially useful 2D-electron-gas-encapsulated material.

AB - We report an observation of a highly anisotropic Dirac-cone structure, and its unconventional electronic behaviors, in high quality SrMnBi2 crystal by angle-resolved photoemission spectroscopy measurement. We observed a well-defined sharp quasiparticle peak in a wide energy range, linearly dispersive, forming a highly anisotropic holelike Dirac cone (vF1/vF2∼5-6). The density of state remains linear, and the scattering rate of the quasiparticle increases linearly as a function of binding energy up to higher binding energy. The results contrast with the expectation for a two-dimensional (2D) or three-dimensional (3D) Fermi-liquid theory and rather suggest the existence of a two-dimensional electron gas system in this 3D material, making SrMnBi2 a potentially useful 2D-electron-gas-encapsulated material.

UR - https://www.scopus.com/pages/publications/84905390025

U2 - 10.1103/PhysRevB.90.035133

DO - 10.1103/PhysRevB.90.035133

M3 - Article

AN - SCOPUS:84905390025

SN - 1098-0121

VL - 90

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 3

M1 - 035133

ER -

Observation of well-defined quasiparticles at a wide energy range in a quasi-two-dimensional system

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