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Title: Nonlinear vs. bolometric radiation response and phonon thermal conductance in graphene-superconductor junctions

Graphene is a promising candidate for building fast and ultra-sensitive bolometric detectors due to its weak electron-phonon coupling and low heat capacity. In order to realize a practical graphene-based bolometer, several important issues, including the nature of radiation response, coupling efficiency to the radiation and the thermal conductance need to be carefully studied. Addressing these issues, we present graphene-superconductor junctions as a viable option to achieve efficient and sensitive bolometers, with the superconductor contacts serving as hot electron barriers. For a graphene-superconductor device with highly transparent interfaces, the resistance readout in the presence of radio frequency radiation is dominated by non-linear response. On the other hand, a graphene-superconductor tunnel device shows dominantly bolometric response to radiation. For graphene devices fabricated on SiO{sub 2} substrates, we confirm recent theoretical predictions of T{sup 2} temperature dependence of phonon thermal conductance in the presence of disorder in the graphene channel at low temperatures.
Authors:
; ;  [1]
  1. Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York (United States)
Publication Date:
OSTI Identifier:
22278035
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRON-PHONON COUPLING; GRAPHENE; INTERFACES; NONLINEAR PROBLEMS; PHONONS; RADIOWAVE RADIATION; SILICON OXIDES; SPECIFIC HEAT; SUBSTRATES; SUPERCONDUCTING JUNCTIONS; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY