Photoinduced transition between conventional and topological insulators in two-dimensional electronic systems

Abstract

Manipulating the topological properties of insulators, encoded in invariants such as the Chern number and its generalizations, is now a major issue for realizing novel charge/spin responses in electron systems. We propose that a simple optical means --subjecting to a driving laser field with circular polarization, can be fruitfully incorporated to this end. Taking as a prototypical example the two-band insulator first considered by Haldane, we show how the electron system can be tuned through phases associated with different Chern numbers as the laser intensity is adiabatically swept; i.e., a photo-induced analog of the quantum Hall plateau transition. The implications of our findings includes the possibility of laser-tuning a conventional insulator into a quantum spin Hall system.

To appear in Phys. Rev. Lett

References in corpus (4)

• Topological Insulators with Inversion Symmetry
• Dissipationless Quantum Spin Current at Room Temperature
• SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors
• The insulator/Chern-insulator transition in the Haldane model

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