Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.246401
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Funding
- JSPS [21224009, 2474022]
- Strategic International Collaborative Research Program (SICORP) from JST, Japan
- MEXT, Japan
- Murata Science Foundation
- JSPS, Japan [23686008]
- Grants-in-Aid for Scientific Research [24740222, 21224009, 23686008] Funding Source: KAKEN
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We performed combined magnetotransport and cyclotron resonance experiments on two-dimensional electron systems confined in the MgxZn1-xO/ZnO heterostructures over a wide range of carrier densities, from 1.9 to 12 x 10(11) cm(-2) (3.5 less than or similar to r(s) less than or similar to 10, where r(s) is the Wigner-Seitz radius). As the carrier density was reduced, the transport mass m(tr)* was strongly enhanced. In marked contrast, the effective masses determined from the cyclotron resonance m(CR)* were found to be independent of the carrier density and as large as the bulk effective mass. The large enhancement of m(tr)*, which exceeds m(CR)* by similar to 60%, at the lowest carrier density with r(s) similar to 10 is purely attributed to the strong electron correlation.
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