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Torsion, Parity-odd Response and Anomalies in Topological States
Onkar Parrikar, Taylor L. Hughes, Robert G. Leigh
We study the response of a class of topological systems to electromagnetic and gravitational sources, including torsion and curvature. By using the technology of anomaly polynomial…
Torsional Response and Dissipationless Viscosity in Topological Insulators
Taylor L. Hughes, Robert G. Leigh, Eduardo Fradkin
We consider the visco-elastic response of the electronic degrees of freedom in 2D and 3D topological insulators (TI). Our primary focus is on the 2D Chern insulator which exhibits…
Non-commutative Chern-Simons for the Quantum Hall System and Duality
Eduardo Fradkin, Vishnu Jejjala, Robert G. Leigh
The quantum Hall system is known to have two mutually dual Chern-Simons descriptions, one associated with the hydrodynamics of the electron fluid, and another associated with the s…