Cavity-enhanced photo-thermoelectric response in graphene under cyclotron resonance

Author:

Park Sabin1ORCID,Moriya Rai1ORCID,Hayashi Kenjiro2ORCID,Fushimi Naoki2,Onodera Momoko1ORCID,Zhang Yijin1ORCID,Watanabe Kenji3ORCID,Taniguchi Takashi4ORCID,Kondo Daiyu2,Sato Shintaro2ORCID,Machida Tomoki1ORCID

Affiliation:

1. Institute of Industrial Science, University of Tokyo 1 , 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan

2. Fujitsu Ltd 2 ., 10-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0197, Japan

3. Research Center for Electronic and Optical Materials, National Institute for Materials Science 3 , 1-1 Namiki, Tsukuba 305-0044, Japan

4. Research Center for Materials Nanoarchitectonics, National Institute for Materials Science 4 , 1-1 Namiki, Tsukuba 305-0044, Japan

Abstract

We investigated the photo-thermoelectric response of Landau-quantized graphene in an infrared optical cavity structure. High-quality graphene/h-BN heterostructure was fabricated on a TiO2/Au optical cavity. We observed a large enhancement of the photo-thermoelectric voltage when the energy of the inter-Landau-level optical absorption, so-called cyclotron resonance, was coincident with that of the cavity mode. This is due to cavity-enhanced cyclotron resonance absorption of mid-infrared light. A maximum photovoltage responsivity of ∼107 V/W was obtained at a wavelength of 9.27 μm under a magnetic field as low as ∼1 Tesla. The obtained responsivity was significantly higher than that of conventional graphene devices. Our results provide an efficient photo-thermoelectric conversion scheme that utilizes Landau-quantized graphene and an optical cavity.

Funder

Core Research for Evolutional Science and Technology

JST-Mirai Program

Precursory Research for Embryonic Science and Technology

Japan Society for the Promotion of Science

Ministry of Education, Culture, Sports, Science and Technology

Tokuyama Science Foundation

Support Center for Advanced Telecommunications Technology Research Foundation

Publisher

AIP Publishing

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