Thickness tuning and terahertz perturbation separate high harmonic generation signals from surface and bulk states in Bi2Se3, revealing topological effects on the surface response.
This result is counterintuitive for an ultrathin (6 nm) film with minimum bulk volume
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Disentangling High Harmonic Generation from Surface and Bulk States of a Topological Insulator
Thickness tuning and terahertz perturbation separate high harmonic generation signals from surface and bulk states in Bi2Se3, revealing topological effects on the surface response.