title: Emergence of a Metallic Quantum Solid Phase in a Rydberg-Dressed Fermi Gas.
abstract: We examine possible low-temperature phases of a repulsively Rydberg-dressed Fermi gas in a three-dimensional 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.
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, Republic of China.
authors.forename: Wei-Han
authors.initials: WH
authors.lastname: Li
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, Republic of China.
authors.forename: Tzu-Chi
authors.initials: TC
authors.lastname: Hsieh
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, Republic of China.|Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan, Republic of China.|Institute of Physics, Academia Sinica, Nankang 115, Taiwan, Republic of China.
authors.forename: Chung-Yu
authors.initials: CY
authors.lastname: Mou
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, Republic of China.|Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan, Republic of China.
authors.forename: Daw-Wei
authors.initials: DW
authors.lastname: Wang