TY - JOUR
T1 - Spin-polarized transport in Rashba quantum point contacts
AU - Kita, T.
AU - Kakegawa, T.
AU - Akabori, M.
AU - Yamada, S.
PY - 2004/4/1
Y1 - 2004/4/1
N2 - Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.
AB - Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.
KW - Conductance quantization
KW - Quantum point contacts
KW - Quantum wire
KW - Spin-orbit interaction
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U2 - 10.1016/j.physe.2003.12.046
DO - 10.1016/j.physe.2003.12.046
M3 - Conference article
AN - SCOPUS:1842734101
VL - 22
SP - 464
EP - 467
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 1-3
T2 - 15th International Conference on ELectronic Propreties
Y2 - 14 July 2003 through 18 July 2003
ER -