TY - JOUR
T1 - The 0.7 anomaly in one-dimensional hole quantum wires
AU - Hamilton, A. R.
AU - Danneau, R.
AU - Klochan, O.
AU - Clarke, W. R.
AU - Micolich, A. P.
AU - Ho, L. H.
AU - Simmons, M. Y.
AU - Ritchie, D. A.
AU - Pepper, M.
AU - Muraki, K.
AU - Hirayama, Yoshiro
PY - 2008/4/23
Y1 - 2008/4/23
N2 - In this paper we study the anomalous 0.7 structure in high quality ballistic one-dimensional hole systems. Hole systems are of interest because of their large effective mass, strong spin-orbit coupling, as well as having spin3/2 compared to spin1/2 for electrons. We observe remarkably clean conductance quantization in a variety of different samples, and a strong feature at ∼0.7 × 2e2/h, which shows a similar temperature and density dependence to the 0.7 feature observed in electron systems. In contrast to the case for electrons, the strong spin-orbit coupling results in an anisotropic Zeeman splitting, which we use to probe the 0.7 feature and the associated zero-bias anomaly. Our results indicate that the 0.7 feature and the zero-bias anomaly are related, and both are suppressed by spin polarization. These results place valuable constraints on models of the microscopic origins of the 0.7 feature.
AB - In this paper we study the anomalous 0.7 structure in high quality ballistic one-dimensional hole systems. Hole systems are of interest because of their large effective mass, strong spin-orbit coupling, as well as having spin3/2 compared to spin1/2 for electrons. We observe remarkably clean conductance quantization in a variety of different samples, and a strong feature at ∼0.7 × 2e2/h, which shows a similar temperature and density dependence to the 0.7 feature observed in electron systems. In contrast to the case for electrons, the strong spin-orbit coupling results in an anisotropic Zeeman splitting, which we use to probe the 0.7 feature and the associated zero-bias anomaly. Our results indicate that the 0.7 feature and the zero-bias anomaly are related, and both are suppressed by spin polarization. These results place valuable constraints on models of the microscopic origins of the 0.7 feature.
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U2 - 10.1088/0953-8984/20/16/164205
DO - 10.1088/0953-8984/20/16/164205
M3 - Article
AN - SCOPUS:42549149326
VL - 20
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 16
M1 - 164205
ER -