Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
PDFLaTeX, 5 pages, 3 figures
Scientific paper
We study charge pumping through the interface between the ferromagnetic (F) overlayer and a three-dimensional topological insulator (TI) using multiphoton nonequilibrium Green function formalism. The microwave-driven magnetization precession of the F overlayer leads to the time-dependent exchange field which can induce surface energy gap via the magnetic proximity effect, thereby forcing Dirac fermions on the TI surface to acquire a time-dependent mass. This leads to the huge enhancement of the dc pumping voltage $V_{\rm pump}$, which is proportional to the microwave frequency $\omega$, when compared with the case without the surface gap opening where $V_{\rm pump}$ is governed only by the spin-orbit coupling on the surface of TI. The predicted effect survives even when the Fermi energy is outside of the surface gap or with finite density of charge carriers in the bulk of the TI slab.
Mahfouzi Farzad
Nagaosa Naoto
Nikolic Branislav K.
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