Abstract
In this study we present magnetotransport an magnetooptical data obtained in the magnetic field range 0T < B < 7T at detectors patterned in Corbino geometry on epitaxial graphene wafer using a Ge detector. We observed the cyclotron resonance of charge carriers in these wafers by measurement of the transmission of THz wafes through the unpatterned squares (about 4 × 4mm2) of the wafers as a function of the magnetic field B applied perpendicular to the wafer. Further, we performed measurements of the photocunductivity of graphene-based devices shaped in Corbino geometry, induced by terahertz (THz) radiation generated by a p-Ge laser (emitting in the energy range 7.5meV ≤ Eph ≤ 11meV). Our photoconductivity measurement imply that graphene devices are suitable for the detection of terahertz radiation.
Highlights
THz radiation is very promising to open new opportunities in many fields such as for example the material research, medical technology and basic astro- and atmosphere physics
For graphene on the other hand—fabricated for the first time in 2004 by mechanical exfoliation[3]— calculations predict that a Landau-Level (LL) split of ∆EL ≈ 10meV can be achieved with magnetic fields smaller than 0.5 T [4]
Experimental We investigated two graphene samples
Summary
THz radiation is very promising to open new opportunities in many fields such as for example the material research, medical technology and basic astro- and atmosphere physics. One possibility for the realization of a THz detector is by exploiting the Landau quantization in quantum Hall detectors. To achieve a quantization of 10 meV For graphene on the other hand—fabricated for the first time in 2004 by mechanical exfoliation[3]— calculations predict that a Landau-Level (LL) split of ∆EL ≈ 10meV can be achieved with magnetic fields smaller than 0.5 T [4].
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