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W2063060788 abstract "Low-field negative magnetoresistance has been studied on ${mathit{G}}_{mathit{a}}^{+}$ ion focused-ion-beam-patterned GaAs/${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Al}}_{mathit{x}}$As heterojunctions as a function of carrier density and temperature. The negative magnetoresistance (NMR) is very large at low densities and decreases with increasing carrier density, giving a magnetoconductance linear in T at low densities but closer to a lnT dependence at higher values. The NMR of this grid structure is well explained using weak localization modified by boundary scattering in an array of one-dimensional point contacts. The NMR disappears after illumination as the patterning is screened by the increased electron density. From this model, we fit the phase-breaking rate as 1/${mathrm{ensuremath{tau}}}_{mathrm{ensuremath{varphi}}}$=A+BT, where the constant term is attributed to boundary scattering and the linear temperature dependence arises from electron-electron scattering." @default.
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W2063060788 date "1993-03-15" @default.
W2063060788 modified "2023-09-25" @default.
W2063060788 title "Low-field magnetotransport study of localization in a mesoscopic antidot array" @default.
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W2063060788 doi "https://doi.org/10.1103/physrevb.47.7354" @default.
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