TY - JOUR
T1 - In-plane magnetic-field-induced metal-insulator transition in (311)A GaAs two-dimensional hole systems probed by thermopower
AU - Faniel, S.
AU - Moldovan, L.
AU - Vlad, A.
AU - Tutuc, E.
AU - Bishop, N.
AU - Melinte, S.
AU - Shayegan, M.
AU - Bayot, V.
PY - 2007/10/12
Y1 - 2007/10/12
N2 - We report thermopower measurements in dilute (311)A GaAs two-dimensional holes subjected to an in-plane magnetic field B that drives the system through a metal-insulator transition (MIT). The diffusion thermopower Sd decreases linearly with temperature at low B for both low-mobility [01 1̄] and high-mobility [2̄ 33] directions, as expected for metallic systems. At high B, in the insulating phase, Sd changes sign along [01 1̄], while Sd drops to zero along [2̄ 33]. This behavior suggests that the system does not undergo any ground-state modification but, rather, that the apparent MIT transition is accompanied by a dramatic change in the dominant scattering mechanisms.
AB - We report thermopower measurements in dilute (311)A GaAs two-dimensional holes subjected to an in-plane magnetic field B that drives the system through a metal-insulator transition (MIT). The diffusion thermopower Sd decreases linearly with temperature at low B for both low-mobility [01 1̄] and high-mobility [2̄ 33] directions, as expected for metallic systems. At high B, in the insulating phase, Sd changes sign along [01 1̄], while Sd drops to zero along [2̄ 33]. This behavior suggests that the system does not undergo any ground-state modification but, rather, that the apparent MIT transition is accompanied by a dramatic change in the dominant scattering mechanisms.
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U2 - 10.1103/PhysRevB.76.161307
DO - 10.1103/PhysRevB.76.161307
M3 - Article
AN - SCOPUS:35348826150
SN - 1098-0121
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 16
M1 - 161307
ER -