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TT: Fachverband Tiefe Temperaturen

TT 9: Focus Session: Anomalous Quantum Oscillations

Monday, March 18, 2024, 15:00–18:15, H 0104

Quantum oscillation (QO) phenomena describe the periodic variation of thermodynamic and transport properties of materials as a function of magnetic field. Since their discovery almost a century ago, their observation has been taken as a definite sign for the presence of a Fermi surface (FS) in metals. The standard theory of Onsager connects the QO frequency with the momentum space area of FS orbits forming the basis of a well-established experimental procedure for determining the electronic structure of metals. However, recent developments have challenged this canonical description of QOs. New mechanisms have been proposed to explain anomalous QO observed in several materials ranging from twisted bilayer graphene to topological multifold-semimetals like CoSi and beyond. The proposed Focus Session aims to connect recent advances in the theoretical description of QO with specific experimental signatures in correlated metallic materials. The symposium will highlight the intimate connection between fluctuation contributions to QOs and the subtle experimental evidence for identifying the correct electronic structure.
Organizers: Johannes Knolle (TU Munich), Christian Pfleiderer (TU Munich)

	15:00	TT 9.1	Invited Talk: Unusual Magnetic Oscillations in Kagome Mott Insulators — •Lu Li
	15:30	TT 9.2	Invited Talk: Quantum oscillations in small-gap insulators — •Nigel Cooper
	16:00	TT 9.3	Invited Talk: Quantum Oscillations of the Quasiparticle Lifetime in a Metal — •Nico Huber, Valentin Leeb, Andreas Bauer, Georg Benka, Johannes Knolle, Christian Pfleiderer, and Marc A. Wilde
	16:30		15 min. break
	16:45	TT 9.4	Invited Talk: Simplicity of quantum oscillations in CoSi from its hidden quasi-symmetry — •Philip J.W. Moll, Chunyu Guo, Lunhui Hu, Carsten Putzke, Jonas Diaz, Xiangwei Huang, Kaustuv Manna, Feng-Ren Fan, Yan Sun, Chandra Shekhar, Claudia Felser, Chaoxing Liu, and Andrei B Bernevig
	17:15	TT 9.5	Invited Talk: Quantum oscillations of superconducting iron-chalcogenides FeSe1−xSx — •Amalia Coldea
	17:45	TT 9.6	Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe — •Valentin Leeb and Johannes Knolle
	18:00	TT 9.7	Interaction-induced quantum oscillations of the lifetime — •Przemyslaw Bieniek, Valentin Leeb, and Johannes Knolle