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- W2023975066 abstract "Dirac-Weyl fermions are massless relativistic particles with a well-defined helicity which arise in the context of high-energy physics. Here we propose a quantum simulation of these paradigmatic fermions using multicomponent ultracold atoms in a two-dimensional square optical lattice. We find that laser-assisted spin-dependent hopping, specifically tuned to the $(2s+1)$-dimensional representations of the $mathfrak{su}$(2) Lie algebra, directly leads to a regime where the emerging massless excitations correspond to Dirac-Weyl fermions with arbitrary pseudospin $s$. We show that this platform hosts two different phases: a semimetallic phase that occurs for half-integer $s$, and a metallic phase that contains a flat zero-energy band at integer $s$. These phases host a variety of interesting effects, such as a very rich anomalous quantum Hall effect and a remarkable multirefringent Klein tunneling. In addition, we show that these effects are directly related to the number of underlying Dirac-Weyl species and zero modes." @default.
- W2023975066 created "2016-06-24" @default.
- W2023975066 creator A5017050666 @default.
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- W2023975066 creator A5083932690 @default.
- W2023975066 date "2011-10-14" @default.
- W2023975066 modified "2023-10-16" @default.
- W2023975066 title "Dirac-Weyl fermions with arbitrary spin in two-dimensional optical superlattices" @default.
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- W2023975066 doi "https://doi.org/10.1103/physrevb.84.165115" @default.
- W2023975066 hasPublicationYear "2011" @default.
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