Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 36: Correlated Electrons: 1D Theory
TT 36.4: Talk
Tuesday, March 13, 2018, 10:15–10:30, HFT-FT 101
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.
Bischoff et al., arXiv:1706.02679