Shot Noise Suppression at Non-integer Conductance Plateaus in a Quantum Point Contact

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dc.creatorKim, N. Y.
dc.creatorOliver, W. D.
dc.creatorYamamoto, Y.
dc.creatorHirayama, Y.
dc.date2003-11-19
dc.date.accessioned2026-07-07T02:54:50Z
dc.date.available2026-07-07T02:54:50Z
dc.descriptionWe study non-equilibrium differential conductance and current fluctuations in a single quantum point contact. The two-terminal electrical transport properties -- differential conductance and shot noise -- are measured at 1.5 K as a function of the drain-source voltage and the Schottky split-gate voltage. In differential conductance measurements, conductance plateaus appear at integer multiples of $2e^2/h$ when the drain-source voltage is small, and the plateaus evolve to a fractional of $2e^2/h$ as the drain-source voltage increases. Our shot noise measurements correspondingly show that the shot noise signal is highly suppressed at both the integer and the non-integer conductance plateaus. This main feature can be understood by the induced electrostatic potential model within a single electron picture. In addition, we observe the 0.7 structure in the differential conductance and the suppressed shot noise around 0.7 ($2e^2/h$); however, the previous single-electron model cannot explain the 0.7 structure and the noise suppression, suggesting that this characteristic relates to the electron-electron interactions.
dc.description4 pages, 4 figures, RevTeX4
dc.identifierhttps://arxiv.org/abs/cond-mat/0311435
dc.identifierhttp://arxiv.org/abs/cond-mat/0311435
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22723
dc.subjectMesoscale and Nanoscale Physics
dc.titleShot Noise Suppression at Non-integer Conductance Plateaus in a Quantum Point Contact
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