Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 48: Quantum Gases (Fermions) III
Q 48.8: Talk
Wednesday, March 7, 2018, 15:45–16:00, K 1.022
Tuning the Drude Weight of Dirac-Weyl Fermions in One-Dimensional Ring Traps — Manon Bischoff1, Johannes Jünemann1,2, Marco Polini3, and •Matteo Rizzi1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany — 2Graduate School Materials Science in Mainz, Mainz, Germany — 3Istituto Italiano di Tecnologia, Graphene Labs, Genova, Italy
We study the response to an applied flux of an interacting system of Dirac-Weyl fermions confined in a one-dimensional (1D) ring. Combining analytical calculations with density-matrix renormalization group results, we show that tuning of interactions leads to a unique many-body system that displays either a suppression or an enhancement of the Drude weight – the zero-frequency peak in the ac conductivity – with respect to the non-interacting value. An asymmetry in the interaction strength between same- and different-pseudospin Dirac-Weyl fermions leads to Drude weight enhancement. Viceversa, symmetric interactions lead to Drude weight suppression. Our predictions can be tested in mixtures of ultracold fermions in 1D ring traps.
Ref.: Bischoff, et al., arXiv:1706.02679v1