Colloquium
Department of Physics, NCU
Emergence of a Metallic Quantum Solid Phase in a Rydberg-Dressed Fermi Gas
Speaker
Prof. Daw-Wei Wang(王道維)
Department of Physics, NTHU
Date 2017.02.21(Tue)
Time 14:00
Place S4-625
Abstract:
We examine possible low-temperature phases of a repulsively Rydberg-dressed Fermi gas in a threedimensional free space. It is shown that the collective density excitations develop a roton minimum, which is softened at a wave vector smaller than the Fermi wave vector when the particle density is above a critical value. The mean field calculation shows that, unlike the insulating density wave states often observed in conventional condensed matters, a self-assembled metallic density wave state emerges at low temperatures. In particular, the density wave state supports a Fermi surface and a body-centered-cubic crystal order at the same time with the estimated critical temperature being about one tenth of the noninteracting Fermi energy. Our results suggest the emergence of a fermionic quantum solid that should be observable in the current experimental setup.
Ref: Wei-Han Li, Tzu-Chi Hsieh, Chung-Yu Mou, and Daw-Wei Wang
Phys. Rev. Lett. 117, 035301(2016)