Theoretical Physics Colloquium: Sandwiches and Mille-Feuilles of 2D quantum spin liquids: solid state research in the era of the 2nd quantum revolution
Time
Monday, 22. January 2024
13:30 - 15:00
Location
P 603
Organizer
FB Physik - Host: Prof Zilberberg / Organisation: Prof Javier Del Pino
Speaker:
Elio König Max Planck Institut für Festkörperforschung Stuttgart
The patterns of self-organization in complex quantum systems are central to quantum
many-body physics. Specifically, quantum order in the absence of symmetry breaking, in
particular highly entangled topologically ordered states, describes fundamentally distinct
phases of matter that are of great interest both in present-day solid state research and in
quantum information science. In this talk, I will spend some time reviewing the concepts of
topological and non-symmetry broken quantum order and relate to quantum spin liquid
states discussed in the context of quantum materials. I will then focus on the interplay of
such exotic states with gapless fermions, i.e., metals, as is of relevance to
heterostructures of van der Waals materials. Specifically I will discuss signatures of
quantum spin liquids "sandwich" heterostructures. I will also discuss bulk 4Hb-TaS2, which
was promoted as a candidate material for alternating QSL and metallic layers (a "mille-
feuille") and attempt to provide theoretical insight into its unconventional superconducting
properties, in particular its enigmatic magnetic memory.
