Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Topological Semimetals I

TT 7.12: Vortrag

Montag, 12. März 2018, 12:30–12:45, A 053

Correlation-driven electron-hole instability in nodal-line semimetal ZrSiS — •Alexander Rudenko^1,2,3, Evgeny Stepanov^1,2, Alexander Lichtenstein⁴, and Mikhail Katsnelson¹ — ¹Radboud University, Nijmegen, The Netherlands — ²Ural Federal University, Ekaterinburg, Russia — ³Wuhan University, Wuhan, China — ⁴Hamburg University, Hamburg, Germany

ZrSiS is an emerging material, which belongs to the class of 3D materials that feature a nodal line in the electronic band structure [1]. Recent experimental observations reveal an unconventional mass enhancement of quasiparticles in ZrSiS [2], which suggests the importance of electron correlation effects in this material. Here, we study many-body effects in ZrSiS using a combination of first-principles calculations and model approaches, taking the correlation effects perturbatively. We show that at moderately low temperatures ZrSiS exhibit electron-hole instability, leading to the formation of a pseudogap in the electronic spectrum. The results can be understood in terms of Coulomb-interaction-assisted electron-hole pairing reminiscent to that of a conventional superconductor.
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