Tunable multiple layered Dirac cones in optical lattices

Zhihao Lan, A. Celi, W. Lu, Patrik Ohberg, M. Lewenstein

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We show that multiple layered Dirac cones can emerge in the band structure of properly addressed multicomponent cold fermionic gases in optical lattices. The layered Dirac cones contain multiple copies of massless spin-1/2 Dirac fermions at the same location in momentum space, whose different Fermi velocity can be tuned at will. On-site microwave Raman transitions can further be used to mix the different Dirac species, resulting in either splitting of or preserving the Dirac point (depending on the symmetry of the on-site term). The tunability of the multiple layered Dirac cones allows us to simulate a number of fundamental phenomena in modern physics, such as neutrino oscillations and exotic particle dispersions with E~p^N for arbitrary integer N.
Original languageEnglish
Pages (from-to)253001-253005
Number of pages5
JournalPhysical Review Letters
Volume107
Issue number25
DOIs
Publication statusPublished - 13 Dec 2011

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