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Abstract: We study the quasiparticle interference QPI patterns caused by scatteringoff nonmagnetic, magnetic point impurities, and edge impurities, separately, ina two dimensional helical liquid, which describes the surface states of atopological insulator. The unique features associated with hexagonal warpingeffects are identified in the QPI patterns of charge density with nonmagneticimpurities and spin density with magnetic impurities. The symmetry propertiesof the QPI patterns can be used to determine the symmetry of microscopicmodels. The Friedel oscillation is calculated for edge impurities and the decayof the oscillation is not universal, strongly depending on Fermi energy. Somediscrepancies between our theoretical results and current experimentalobservations are discussed.



Author: Xiaoting Zhou, Chen Fang, Wei-Feng Tsai, Jiangping Hu

Source: https://arxiv.org/







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