Many-body spin-related phenomena in ultra low-disorder quantum wires

D. J. Reilly; G. R. Facer; A. S. Dzurak; B. E. Kane; R. G. Clark; P. J. Stiles; A. R. Hamilton; J. L. O’brien; N. E. Lumpkin; L. N. Pfeiffer; K. W. West

doi:10.1103/PhysRevB.63.121311

Many-body spin-related phenomena in ultra low-disorder quantum wires

D. J. Reilly, G. R. Facer, A. S. Dzurak, B. E. Kane, R. G. Clark, P. J. Stiles, A. R. Hamilton, J. L. O’brien, N. E. Lumpkin, L. N. Pfeiffer, K. W. West

Research output: Contribution to journal › Article › peer-review

157 Scopus citations

Abstract

Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e²/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder GaAs/Al_xGa_1−xAs quantum wires with nominal lengths l = 0, 0.5, and 2 μm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near 0.7 × 2e²/h for l = 0, whereas the l = 2 μm wires show structure evolving with increasing electron density to 0.5 × 2e²/h, the value expected for an ideal spin-split subband. For intermediate lengths (l = 0.5 μm) the feature at 0.7 × 2e²/h evolves to 0.55 × 2e²/h with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.

Original language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.63.121311
State	Published - Mar 13 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.63.121311

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title = "Many-body spin-related phenomena in ultra low-disorder quantum wires",

abstract = "Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e2/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder GaAs/AlxGa1−xAs quantum wires with nominal lengths l = 0, 0.5, and 2 μm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near 0.7 × 2e2/h for l = 0, whereas the l = 2 μm wires show structure evolving with increasing electron density to 0.5 × 2e2/h, the value expected for an ideal spin-split subband. For intermediate lengths (l = 0.5 μm) the feature at 0.7 × 2e2/h evolves to 0.55 × 2e2/h with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.",

author = "Reilly, {D. J.} and Facer, {G. R.} and Dzurak, {A. S.} and Kane, {B. E.} and Clark, {R. G.} and Stiles, {P. J.} and Hamilton, {A. R.} and O{\textquoteright}brien, {J. L.} and Lumpkin, {N. E.} and Pfeiffer, {L. N.} and West, {K. W.}",

year = "2001",

month = mar,

day = "13",

doi = "10.1103/PhysRevB.63.121311",

language = "English (US)",

volume = "63",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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publisher = "American Physical Society",

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T1 - Many-body spin-related phenomena in ultra low-disorder quantum wires

AU - Reilly, D. J.

AU - Facer, G. R.

AU - Dzurak, A. S.

AU - Kane, B. E.

AU - Clark, R. G.

AU - Stiles, P. J.

AU - Hamilton, A. R.

AU - O’brien, J. L.

AU - Lumpkin, N. E.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 2001/3/13

Y1 - 2001/3/13

N2 - Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e2/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder GaAs/AlxGa1−xAs quantum wires with nominal lengths l = 0, 0.5, and 2 μm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near 0.7 × 2e2/h for l = 0, whereas the l = 2 μm wires show structure evolving with increasing electron density to 0.5 × 2e2/h, the value expected for an ideal spin-split subband. For intermediate lengths (l = 0.5 μm) the feature at 0.7 × 2e2/h evolves to 0.55 × 2e2/h with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.

AB - Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e2/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder GaAs/AlxGa1−xAs quantum wires with nominal lengths l = 0, 0.5, and 2 μm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near 0.7 × 2e2/h for l = 0, whereas the l = 2 μm wires show structure evolving with increasing electron density to 0.5 × 2e2/h, the value expected for an ideal spin-split subband. For intermediate lengths (l = 0.5 μm) the feature at 0.7 × 2e2/h evolves to 0.55 × 2e2/h with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.

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ER -

Many-body spin-related phenomena in ultra low-disorder quantum wires

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