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Microwave Photodetection in an Ultraclean Suspended Bilayer Graphene p-n Junction

Jung, Minkyung and Rickhaus, Peter and Zihlmann, Simon and Makk, Peter and Schonenberger, Christian. (2016) Microwave Photodetection in an Ultraclean Suspended Bilayer Graphene p-n Junction. Nano Letters, 16 (11). pp. 6988-6993.

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Official URL: http://edoc.unibas.ch/52357/

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Abstract

We explore the potential of bilayer graphene as a cryogenic microwave photodetector by studying the microwave absorption in fully suspended clean bilayer graphene p-n junctions in the frequency range of 1-5 GHz at a temperature of 8 K. We observe a distinct photocurrent signal if the device is gated into the p-n regime, while there is almost no signal for unipolar doping in either the n-n or p-p regimes. Most surprisingly, the photocurrent strongly peaks when one side of the junction is gated to the Dirac point (charge-neutrality point CNP), while the other remains in a highly doped state. This is different to previous results where optical radiation was used. We propose a new mechanism based on the phototermal effect explaining the large signal. It requires contact doping and a distinctly different transport mechanism on both sides: one side of graphene is ballistic and the other diffusive. By engineering partially diffusive and partially ballistic devices, the photocurrent can drastically be enhanced.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Jung, Minkyung and Rickhaus, Peter and Zihlmann, Simon and Makk, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:1530-6984
e-ISSN:1530-6992
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:15 Feb 2017 09:41
Deposited On:15 Feb 2017 09:41

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