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) |
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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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