Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 17: Quantum Computation: Simulation I

FM 17.2: Talk

Monday, September 23, 2019, 16:45–17:00, 1010

Simulating a Mott insulator using attractive interaction — •Marcell Gall, Chun Fai Chan, Nicola Wurz, and Michael Köhl — Physikalisches Institut, University of Bonn, Wegelerstraße 8, 53115 Bonn, Germany

Particles can be transformed into their anti-particles by a charge conjugation, and a symmetry upon such conjugation plays a crucial role in physics. For example, all fundamental forces, except weak interaction, obey such symmetry. However, even in the low-energy domain of condensed matter physics, the symmetry gives rise to novel effects and provides stability to exotic quantum states.

In our experiment, we study the particle-hole symmetry in a quantum simulator of the two-dimensional Hubbard model using ultracold fermionic atoms in an optical lattice. In this talk we will demonstrate mapping between charge and spin degrees of freedom. In particular, we show the occurrence of a state with incompressible magnetisation for attractive interactions, corresponding to the Mott phase in the density sector and repulsive interactions.