Observation of well-defined quasi-particle over a wide energy range in quasi-2D system

D.-M.Wang; G.-F. Chen; H. Ding; H. Miao; J.-B. He; L.-L. Jia; M. Shi; P. Richard; S.-C. Wang; T. Qian

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Observation of well-defined quasi-particle over a wide energy range in quasi-2D system

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arxiv 1312.1757 v1 pith:RNRX5UII submitted 2013-12-06 cond-mat.str-el

L.-L. Jia , Z.-H. Liu , Y.-P. Cai , T. Qian , X.-P. Wang , H. Miao , P. Richard , Y.-G. Zhao

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Y. Li M. Shi H. Ding D.-M.Wang J.-B. He G.-F. Chen S.-C. Wang

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keywords energyquasi-particleanisotropicbindingdirac-conehighlinearlyobservation

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abstract

We report the observation by angle-resolved photoemission spectroscopy measurements of a highly anisotropic Dirac-cone structure in high quality SrMnBi2 crystals. We reveal a well-defined sharp quasi-particle, linearly dispersive with $v_{F_1}/v_{F_2}\sim$ 5--6, forming a hole-like anisotropic Dirac-cone. The density of states for the cone remains linear up to as high as ~650 meV of binding energy. The scattering rate of the quasi-particle (QP) increases linearly as function of binding energy, indicating a non-Fermi-Liquid behavior. Our results suggest the existence of a dilute two-dimensional electron gas system in this three-dimensional material.

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