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

Quantum Heterostructures

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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

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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

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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.}",

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day = "25",

doi = "10.1103/PhysRevB.90.035133",

language = "English",

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issn = "1098-0121",

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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.

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U2 - 10.1103/PhysRevB.90.035133

DO - 10.1103/PhysRevB.90.035133

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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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