RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Driven electronic states at the surface of a topological insulator

TitleDriven electronic states at the surface of a topological insulator
Publication TypeJournal Article
Year of Publication2013
AuthorsB. M. Fregoso, Y-H. Wang, N. Gedik, and V. M. Galitski
JournalPhysical Review B
Volume88
Issue15
Pagination155129
Date Published10/23/2013
Accession NumberWOS:000326091700002
KeywordsDirac Cone, Topological Insulator
Abstract

Motivated by recent photoemission experiments on the surface of topological insulators we compute the spectrum of driven topological surface excitations in the presence of an external light source. We completely characterize the spectral function of these nonequilibrium electron excitations for both linear and circular polarizations of the incident light. We find that in the latter case, the circularly polarized light gaps out the surface states, whereas linear polarization gives rise to an anisotropic metal with multiple Dirac cones. We compare the sizes of the gaps with recent pump-probe photoemission measurements and find good agreement. We also identify theoretically several new features in the time-dependent spectral function, such as shadow Dirac cones.

URLhttp://prb.aps.org/abstract/PRB/v88/i15/e155129
DOI10.1103/PhysRevB.88.155129

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to jqi-comm@umd.edu