Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep08160
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Funding
- JSPS through FIRST program
- Photon and Quantum Basic Research Coordinated Development Program from MEXT
- JSPS KAKENHI [20102004, 23540413, 26800165]
- Grants-in-Aid for Scientific Research [23540413, 26400363, 26800165] Funding Source: KAKEN
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Recent studies suggest that an exemplary Kondo insulator SmB6 belongs to a new class of topological insulators (TIs), in which non-trivial spin-polarized metallic states emerge on surface upon the formation of Kondo hybridization gap in the bulk. Remarkably, the bulk resistivity reaches more than 20 Omega cm at 4 K, making SmB6 a candidate for a so-called bulk-insulating TI. We here investigate optical-pulse responses of SmB6 by pump-and-probe photoemission spectroscopy. Surface photovoltage effect is observed below similar to 90 K. This indicates that an optically-active band bending region develops beneath the novel metallic surface upon the bulk-gap evolution. The photovoltaic effect persists for >200 mu s, which is long enough to be detected by electronics devices, and could be utilized for optical gating of the novel metallic surface.
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