Photo-Nernst detection of cyclotron resonance in partially irradiated graphene
Kei Kinoshita, Rai Moriya, Satoru Masubuchi, Kenji Watanabe, Takashi, Taniguchi, and Tomoki Machida
TL;DR
This paper demonstrates a novel photo-Nernst effect-based detection method for cyclotron resonance in partially irradiated graphene, enabling potential far-infrared light detection with enhanced sensitivity at resonance conditions.
Contribution
It introduces a new detection scheme utilizing the photo-Nernst effect in partially masked graphene, improving photon-to-charge conversion for cyclotron resonance detection.
Findings
Enhanced photo-Nernst signal at cyclotron resonance
Selective detection minimizes photovoltaic effects
Dependence of signal on magnetic field and wavelength
Abstract
Cyclotron resonance of a Landau-quantized graphene can absorb significant amount of infrared light. However, application of this phenomenon to the photodetector had been limited due to the lack of efficient photon to charge conversion scheme. Here, we demonstrate the detection of cyclotron resonance in a partially metal-masked monolayer graphene two-terminal device using photo-Nernst effect. Due to the presence of the mask, incident infrared light is irradiated on only one-half of the graphene channel. This partial irradiation creates a temperature gradient perpendicular to the graphene channel. In the presence of an external magnetic field, thermopower is generated perpendicular to the temperature gradient due to the Nernst effect. Consequently, photo-Nernst voltage is generated along the graphene channel, which can be detected from the contacts on both ends of the channel. We…
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