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Photo-thermoelectric detection of cyclotron resonance in asymmetrically carrier-doped graphene two-terminal device
- Publication Year :
- 2018
-
Abstract
- Graphene is known to show a significant photo-thermoelectric effect that can exceed its photovoltaic contribution. Here, by utilizing this effect, we demonstrate a photovoltage measurement of cyclotron resonance in a double-back-gated h-BN/graphene/h-BN two-terminal device. A graphite local bottom gate was fabricated in addition to a p-doped Si global back gate. By tuning the two gate voltages, an in-plane graphene junction having an asymmetric carrier-doping profile was created. With the help of this asymmetric structure, the photo-thermoelectric voltage generated in the vicinity of the metal-electrode/graphene junction was detected. At a low temperature and in the presence of a magnetic field, a photo-induced voltage was measured under the irradiation of an infrared laser (Wavelength= 9.28 to 10.61 micron). We observed a strong enhancement of the photovoltage signal under the cyclotron resonance condition, at which the energy of excitation coincides with a transition between Landau levels. These results highlight the possibility of using the photo-thermoelectric effect in graphene for THz photo-detection.<br />18 pages, 4 Figures, Supplementary information is not included
- Subjects :
- Materials science
Physics and Astronomy (miscellaneous)
Condensed Matter - Mesoscale and Nanoscale Physics
business.industry
Terahertz radiation
Graphene
Far-infrared laser
Cyclotron resonance
Photodetector
FOS: Physical sciences
02 engineering and technology
Landau quantization
021001 nanoscience & nanotechnology
01 natural sciences
law.invention
law
0103 physical sciences
Thermoelectric effect
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Optoelectronics
010306 general physics
0210 nano-technology
business
Excitation
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....8fd2699878df1103d10459fbcbb2ca39