[18p-C202-1~9] 17.2 Graphene

[18p-C202-7] Cyclotron resonance-induced photovoltage in graphene pn junctions

〇Kei Kinoshita¹, Rai Moriya¹, Miho Arai¹, Satoru Masubuchi¹, Kenji Watanabe², Takashi Taniguchi², Tomoki Machida^1,3 (1.IIS Univ.Tokyo, 2.NIMS, 3.CREST-JST)

Keywords:graphene, cyclotron resonance, photovoltage

We measured the photovoltage by irradiating graphene pn junctions with infrared light at low temperature. The photovoltage signal oscillated with respect to both magnetic field and the career concentration due to Landau quantization. The signal was significantly enhanced at the cyclotron resonance condition. Also, the sign of the photovoltage signal was inverted between electron and hole career. From these results, we think that the origin of photovoltage is Seebeck effect of the temperature gradient between the graphene and the metal electrode due to the light absorption.