Erlangen 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Gases (Fermions) III

Q 48.8: Vortrag

Mittwoch, 7. März 2018, 15:45–16:00, K 1.022

Tuning the Drude Weight of Dirac-Weyl Fermions in One-Dimensional Ring TrapsManon Bischoff1, Johannes Jünemann1,2, Marco Polini3, and •Matteo Rizzi11Institut 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

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2018 > Erlangen