05/30
2023
Seminar
- Title题目 Novel avenues for unconventional Fermi surface instabilities
- Speaker报告人 Tilman Schwemmer（Wuerzburg University）
- Date日期 2023年5月30日 10:30
- Venue地点 南楼6620
Abstract摘要
Already at the level of weak coupling, electronic correlation effects beyond single particle propagator renormalization can trigger Fermi surface instabilities such as itinerant magnetism, charge density wave phases, superconductivity, or other symmetry broken states of matter. In this talk, I will present our functional and weak coupling renormalization group studies for electronically driven spontaneous symmetry breaking in two experimentally relevant systems.
The first half of the talk concerns the half-Heusler semimetal and superconductor LuPtBi, where both SOC and electronic correlation effects are prominent, and thus indispensable for any concise theoretical description. The metallic and weakly dispersive surface states of this material feature spin momentum locked Fermi surfaces, which we propose as a possible domain for the onset of unconventional surface superconductivity.
In the second half part we will focus on the extended Kagome Hubbard model as a theoreticians first avenue to interpret experimental results in the recently discovered Kagome metals AV3Sb5. The Kagome sublattice structure of corner sharing triangles, even in a most simplistic single orbital abstraction, already gives rise to an intricate composition of Fermi level eigenstates resulting in the promotion of longer range interactions. In addition to the rich phase diagram of this model, our most recent calculations identify a pair density wave instability in the Kagome Hubbard model, thereby providing a microscopic setting for PDW in a controlled limit.
邀请人：
吴贤新 副研究员
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