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Collective modes of a helical liquid
S. Raghu, Suk Bum Chung, Xiao-Liang Qi +1
We study low energy collective modes and transport properties of the "helical metal" on the surface of a topological insulator. At low energies, electrical transport and spin dynam…
Topological Mott Insulators
S. Raghu, Xiao-Liang Qi, C. Honerkamp +1
We consider extended Hubbard models with repulsive interactions on a Honeycomb lattice and the transitions from the semi-metal phase at half-filling to Mott insulating phases. In p…
Theory of the Three Dimensional Quantum Hall Effect in Graphite
B. Andrei Bernevig, Taylor L. Hughes, Srinivas Raghu +1
We predict the existence of a three dimensional quantum Hall effect plateau in a graphite crystal subject to a magnetic field. The plateau has a Hall conductivity quantized at $\fr…
Analogs of quantum Hall effect edge states in photonic crystals
S. Raghu, F. D. M. Haldane
"Photonic crystals" built with time-reversal-symmetry-breaking Faraday-effect media can exhibit "chiral" edge modes that propagate unidirectionally along boundaries across which th…
Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
F. D. M. Haldane, S. Raghu
We show how in principle to construct analogs of quantum Hall edge states in "photonic crystals" made with non-reciprocal (Faraday-effect) media. These form "one-way waveguides" th…