TY - JOUR
T1 - Insulating phase of a two-dimensional electron gas in MgxZn 1-xO/ZnO heterostructures below ν=13
AU - Kozuka, Y.
AU - Tsukazaki, A.
AU - Maryenko, D.
AU - Falson, J.
AU - Akasaka, S.
AU - Nakahara, K.
AU - Nakamura, S.
AU - Awaji, S.
AU - Ueno, K.
AU - Kawasaki, M.
PY - 2011/7/11
Y1 - 2011/7/11
N2 - We report magnetotransport properties of a two-dimensional electron gas confined at MgZnO/ZnO heterointerface in a high magnetic field up to 26 T. High electron mobility and low charge carrier density enabled the observation of the fractional quantum Hall state ν = 1/3. For an even lower charge carrier density, we observe a transition from quantum Hall liquid to an insulator below the filling factor 1/3. Because of the large electron effective mass in ZnO, we suggest the MgZnO/ZnO heterostructures to be a prototype system for highly correlated quantum Hall physics.
AB - We report magnetotransport properties of a two-dimensional electron gas confined at MgZnO/ZnO heterointerface in a high magnetic field up to 26 T. High electron mobility and low charge carrier density enabled the observation of the fractional quantum Hall state ν = 1/3. For an even lower charge carrier density, we observe a transition from quantum Hall liquid to an insulator below the filling factor 1/3. Because of the large electron effective mass in ZnO, we suggest the MgZnO/ZnO heterostructures to be a prototype system for highly correlated quantum Hall physics.
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U2 - 10.1103/PhysRevB.84.033304
DO - 10.1103/PhysRevB.84.033304
M3 - Article
AN - SCOPUS:79961228620
SN - 1098-0121
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 3
M1 - 033304
ER -