Spin-polarized STM spectra of Dirac electrons on the surface of a topological insulator
Data(s) |
2011
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Resumo |
We provide a theory for the tunneling conductance G(V) of Dirac electrons on the surface of a topological insulator as measured by a spin-polarized scanning tunneling microscope tip for low-bias voltages V. We show that if the in-plane rotational symmetry on the surface of the topological insulator is broken by an external field that does not couple to spin directly (such as an in-plane electric field), G(V) exhibits an unconventional dependence on the direction of the magnetization of the tip, i.e., it acquires a dependence on the azimuthal angle of the magnetization of the tip. We also show that G(V) can be used to measure the magnitude of the local out-of-plane spin orientation of the Dirac electrons on the surface. We explain the role of the Dirac electrons in this unconventional behavior and suggest experiments to test our theory. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/42281/1/phy_rev_b_84_2011.pdf Saha, K and Das, Sourin and Sengupta, K and Sen, Diptiman (2011) Spin-polarized STM spectra of Dirac electrons on the surface of a topological insulator. In: Physical Review B: Condensed Matter and Materials Physics, 84 (16). |
Publicador |
The American Physical Society |
Relação |
http://prb.aps.org/abstract/PRB/v84/i16/e165439 http://eprints.iisc.ernet.in/42281/ |
Palavras-Chave | #Centre for High Energy Physics |
Tipo |
Journal Article PeerReviewed |