Monopole Current and Unconventional Hall Response on Topological Insulator

Details Monopole Current and Unconventional Hall Response on Topological Insulator Monopole Current and Unconventional Hall Response on Topological Insulator

2010-01-11

arxiv.org/abs/1001.1578v1

Phys. Rev. B. 81, 245125 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

We study theoretically the charged current above a topological insulator (TI) separated by a ferromagnetic insulating layer. An unconventional Hall response occurs in the conducting layer on top of the TI which approaches to a constant value independent of R for R<>l, where R is the separation between TI and conducting layer and l is the screening length. In the comoving frame, it can be interpreted as a monopole current attached to the TI surface. The same mechanism gives the Hall response and deflection of the electron beam injected to the surface of insulating ferromagnet. A realistic estimate of an order of magnitude shows that both effects give reasonably large signal experimentally accessible.

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