Tunable multiple layered Dirac cones in optical lattices

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...

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Bibliographic Details
Published in:Physical review letters 2011-12, Vol.107 (25), p.253001-253001, Article 253001
Main Authors: Lan, Z, Celi, A, Lu, W, Öhberg, P, Lewenstein, M
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
CONES
DIRAC OPERATORS
DISPERSIONS
ELECTROMAGNETIC RADIATION
FERMIONS
FLUIDS
GASES
MATHEMATICAL OPERATORS
MICROWAVE RADIATION
NEUTRINO OSCILLATION
PARTICLE PROPERTIES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM OPERATORS
RADIATIONS
SPIN
SYMMETRY
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.253001