Control of a two-dimensional electron gas on SrTiO₃(111) by atomic oxygen
We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of th...
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| Veröffentlicht in: | Physical review letters 2014-10, Vol.113 (17), p.177601-177601 |
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| container_issue | 17 |
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| container_title | Physical review letters |
| container_volume | 113 |
| creator | Walker, S McKeown de la Torre, A Bruno, F Y Tamai, A Kim, T K Hoesch, M Shi, M Bahramy, M S King, P D C Baumberger, F |
| description | We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG. |
| doi_str_mv | 10.1103/PhysRevLett.113.177601 |
| format | Article |
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| ispartof | Physical review letters, 2014-10, Vol.113 (17), p.177601-177601 |
| issn | 0031-9007 1079-7114 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1786213381 |
| source | American Physical Society Journals |
| subjects | Anisotropy Atomic oxygen Carrier density Electron gas Electronic structure Tuning Two dimensional Ultraviolet |
| title | Control of a two-dimensional electron gas on SrTiO₃(111) by atomic oxygen |
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