TY - JOUR
T1 - Correlation-enhanced effective mass of two-dimensional electrons in Mg xZn1-xO/ZnO heterostructures
AU - Kasahara, Y.
AU - Oshima, Y.
AU - Falson, J.
AU - Kozuka, Y.
AU - Tsukazaki, A.
AU - Kawasaki, M.
AU - Iwasa, Y.
PY - 2012/12/10
Y1 - 2012/12/10
N2 - We performed combined magnetotransport and cyclotron resonance experiments on two-dimensional electron systems confined in the MgxZn 1-xO/ZnO heterostructures over a wide range of carrier densities, from 1.9 to 12×1011cm-2 (3.5â‰r sâ‰10, where rs is the Wigner-Seitz radius). As the carrier density was reduced, the transport mass mtr* was strongly enhanced. In marked contrast, the effective masses determined from the cyclotron resonance mCR* were found to be independent of the carrier density and <?format ?>as large as the bulk effective mass. The large enhancement of mtr*, which exceeds mCR* by ∼60%, at the lowest carrier density with rs∼10 is purely attributed to the strong electron correlation.
AB - We performed combined magnetotransport and cyclotron resonance experiments on two-dimensional electron systems confined in the MgxZn 1-xO/ZnO heterostructures over a wide range of carrier densities, from 1.9 to 12×1011cm-2 (3.5â‰r sâ‰10, where rs is the Wigner-Seitz radius). As the carrier density was reduced, the transport mass mtr* was strongly enhanced. In marked contrast, the effective masses determined from the cyclotron resonance mCR* were found to be independent of the carrier density and <?format ?>as large as the bulk effective mass. The large enhancement of mtr*, which exceeds mCR* by ∼60%, at the lowest carrier density with rs∼10 is purely attributed to the strong electron correlation.
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U2 - 10.1103/PhysRevLett.109.246401
DO - 10.1103/PhysRevLett.109.246401
M3 - Article
AN - SCOPUS:84870944264
VL - 109
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 24
M1 - 246401
ER -