TY - JOUR
T1 - Coulomb drag between quantum wires
T2 - 14th International Conference on the
AU - Yamamoto, M.
AU - Stopa, M.
AU - Tokura, Y.
AU - Hirayama, Y.
AU - Tarucha, S.
N1 - Funding Information:
We acknowledge financial support by the Specially Promoted Research, Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan and by CREST-JST.
PY - 2002/1
Y1 - 2002/1
N2 - We have measured the drag resistance RD between parallel, split gate quantum wires fabricated on an n-GaAs/GaAs 2DEG heterostructure in magnetic fields B from zero up to the edge state regime. We find that a peak in RD associated with the alignment of the Fermi wave vectors in the drive and drag wires at B = 0 vanishes in the edge state regime of the drag-wire conductance. This effect is attributed to suppressed backscattering. By contrast, when the conductance of both wires is appreciably below the first plateau, a peak in RD which occurs for B = 0 is enhanced by an order of magnitude in the strong field. This behavior appears to emerge from the quasi-singular nature of the density of states at the bottom of a Landau band. Finally, for both zero and non-zero fields, we observe negative Coulomb drag when the drive-wire density is driven close to pinch off and it is high enough. The negative drag can be explained in terms of the response of a 1D Fermi liquid to a sliding Wigner crystal in the drive wire.
AB - We have measured the drag resistance RD between parallel, split gate quantum wires fabricated on an n-GaAs/GaAs 2DEG heterostructure in magnetic fields B from zero up to the edge state regime. We find that a peak in RD associated with the alignment of the Fermi wave vectors in the drive and drag wires at B = 0 vanishes in the edge state regime of the drag-wire conductance. This effect is attributed to suppressed backscattering. By contrast, when the conductance of both wires is appreciably below the first plateau, a peak in RD which occurs for B = 0 is enhanced by an order of magnitude in the strong field. This behavior appears to emerge from the quasi-singular nature of the density of states at the bottom of a Landau band. Finally, for both zero and non-zero fields, we observe negative Coulomb drag when the drive-wire density is driven close to pinch off and it is high enough. The negative drag can be explained in terms of the response of a 1D Fermi liquid to a sliding Wigner crystal in the drive wire.
KW - Coulomb drag
KW - Quantum wire
KW - Wigner crystal
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U2 - 10.1016/S1386-9477(01)00461-1
DO - 10.1016/S1386-9477(01)00461-1
M3 - Conference article
AN - SCOPUS:0035239484
SN - 1386-9477
VL - 12
SP - 726
EP - 729
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
IS - 1-4
Y2 - 30 July 2001 through 3 August 2001
ER -