期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.117602
关键词
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资金
- U.K. EPSRC
- ERC [207901]
- Scottish Funding Council
- Suranaree University of Technology
- Japan Society for the Promotion of Science (JSPS)
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515, DE-AC02-05CH11231, DE-AC03-76SF00098]
- Engineering and Physical Sciences Research Council [EP/I031014/1] Funding Source: researchfish
- EPSRC [EP/I031014/1] Funding Source: UKRI
- European Research Council (ERC) [207901] Funding Source: European Research Council (ERC)
- Grants-in-Aid for Scientific Research [21340091] Funding Source: KAKEN
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of the 5d transition-metal oxide KTaO3. From angle-resolved photoemission, we find that quantum confinement lifts the orbital degeneracy of the bulk band structure and leads to a 2DEG composed of ladders of subband states of both light and heavy carriers. Despite the strong spin-orbit coupling, our measurements provide a direct upper bound for the potential Rashba spin splitting of only Delta k(parallel to) similar to 0.02 angstrom(-1) at the Fermi level. The polar nature of the KTaO3(100) surface appears to help mediate the formation of the 2DEG as compared to nonpolar SrTiO3(100).
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