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Materials Design from Nonequilibrium Steady States: Driven Graphene as a Tunable Semiconductor with Topological Properties

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Iadecola, T., Campbell, D., Chamon, C., Hou, C.-Y., Jackiw, R., Pi, S.-Y., et al. (2013). Materials Design from Nonequilibrium Steady States: Driven Graphene as a Tunable Semiconductor with Topological Properties. PHYSICAL REVIEW LETTERS, 110(17): 176603. doi:10.1103/PhysRevLett.110.176603.


Cite as: http://hdl.handle.net/21.11116/0000-0001-DF3F-F
Abstract
Controlling the properties of materials by driving them out of equilibrium is an exciting prospect that has only recently begun to be explored. In this Letter we give a striking theoretical example of such materials design: a tunable gap in monolayer graphene is generated by exciting a particular optical phonon. We show that the system reaches a steady state whose transport properties are the same as if the system had a static electronic gap, controllable by the driving amplitude. Moreover, the steady state displays topological phenomena: there are chiral edge currents, which circulate a fractional charge e/2 per rotation cycle, with the frequency set by the optical phonon frequency. DOI: 10.1103/PhysRevLett.110.176603