American Physical Society Sites|APS|Journals|PhysicsCentral|Physics

Session A49: Nanostructures: Interaction Effects

8:00 AM–10:48 AM, Monday, March 3, 2014
Room: Mile High Ballroom 1C

Sponsoring Unit: DCMP
Chair: Michael Scheibner, University of California, Merced

Abstract ID: BAPS.2014.MAR.A49.11

Abstract: A49.00011 : Resolution effects on the current measurement in a resonant level model

10:00 AM–10:12 AM

Preview Abstract      Abstract  

Authors:

Yasuhiro Yamada
(Department of Applied Physics, University of Tokyo)

Masatoshi Imada
(Department of Applied Physics, University of Tokyo)

Current measurements have attracted much attention in studies on understanding the intrinsic information of nanoscale systems. Here, we theoretically study the influence of the smallest detectable change in the measurement, i.e. resolution, on the outcomes of the measurements, using an extension of the full counting statistics for a resonant level model. It is shown that the limited resolution of current measurement gives rise to a positive excess noise, which leads to a violation of the Johnson-Nyquist relation naively expected between the measured conductance and the measured current noise. The deviation from the Johnson-Nyquist relation exhibits universal single-parameter scaling with the nondimensional scaling variable $S_0/S_M$ where $S_0$ is the intrinsic noise and $S_M$ represents the characteristic noise determined from the measurement process. In addition, our findings offer an explanation for anomalous enhancement of noise temperature observed in Johnson noise thermometry. [1] Y. Yamada and M. Imada, arXiv:1307.7535.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.A49.11