Bolometric detection of quantum shot noise in coupled mesoscopic systems

Physical Review B - Condensed Matter and Materials Physics

Volumn 78, Issue 24, 2008, Pages

  Hashisaka, Masayuki ^a   Yamauchi, Yoshiaki ^a   Nakamura, Shuji ^a   Kasai, Shinya ^a   Ono, Teruo ^a   Kobayashi, Kensuke ^a  

^a KYOTO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 58149271048     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.241303     Document Type: Article

References (31)

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25. While the shot noise gives the dominant contribution, to be more precise, QPC2 is a nonequilibrium noise detector.
26. This capacitive coupling model is the most feasible explanation for the bolometric detection because of its high efficiency, while other mechanisms [coupling via phonons (Ref.), for example] might also play a role in the energy transfer between the QPCs.
27. As the nonlocal shot noise detection is caused by the capacitive coupling between two QPCs, it is expected that the efficiency (A) of the nonlocal detection does not depend on the geometrical distance between the source QPC and the detector. We have experimentally confirmed it by using several detectors located a few micrometers (1, 3.5, and 5 μm) away from the source QPC.
28. The value is overestimated as the transimpedance should be lowered from the estimation in the simple circuit model due to the stray capacitance around the DQPC sample (Ref.).
29. We confirmed the bolometric noise detection when the detector QPC is set to out of the first conductance plateau. The efficiency of the detector monotonously decreases with increasing the conductance of the detector. For example, the detection efficiency with the detector set to the second plateau was 8%.
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