Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 76: Topology: Other Topics
TT 76.3: Vortrag
Mittwoch, 14. März 2018, 17:30–17:45, A 053
Quantum Oscillations in Insulators with Neutral Fermi Surfaces — •Inti Sodemann1, Debanjan Chowdhury2, and T. Senthil2 — 1Max-Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany — 2Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
We describe a theory of quantum oscillations in insulators with a fermi sea of neutral fermions minimally coupled to an emergent U(1) gauge field. In the presence of a physical magnetic field the emergent magnetic field develops a non-zero value leading to Landau quantization for the neutral fermions. We will describe the temperature and magnetic field dependence of oscillations in magnetization and in electrical resistivity and discuss suitable experimental conditions for the observation of these effects in the composite exciton fermi liquid state proposed in mixed valence insulators as well as in the spinon fermi surface state proposed in triangular organic materials.