Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: New Methods and Developments: Scanning Probe Techniques 1 (joint session O/KFM)

KFM 5.3: Vortrag

Montag, 5. September 2022, 11:15–11:30, S053

General, Strong Impurity-Strength Dependence of Quasiparticle Interference — •Seung-Ju Hong1, Jae-Mo Lihm1,2,3, and Cheol-Hwan Park1,2,31Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea — 2Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, South Korea — 3Center for Theoretical Physics, Seoul National University, Seoul 08826, South Korea

Quasiparticle interference patterns induced by impurities contain information about electronic structures in momentum space. In this presentation, we show that the interpretation of quasiparticle interference patterns is not trivial and needs special care. Even in the simple case of a single-site impurity on the square lattice, the pattern is strongly dependent on the strength of impurity potential. For example, the wave vector with the strongest scattering differs by about 16% in spin-dependent JDOS and exact QPI computations. We also showed that this dependence can be analyzed by decomposing the pattern into the impurity-dependent T-matrix part and momentum-dependent Green function part. We applied our formalism to TaAs, an archetype Weyl semimetal with first-principles calculations. We find that the strong dependence on impurities is also present in TaAs. Thus, our work demonstrates that these quasiparticle interference patterns must be analyzed with care and needs more attention.

Reference [1] S.-J. Hong, J.-M. Lihm, and C.-H. Park, J. Phys. Chem. C 2021, 125, 13, 7488-7494

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