Polarization dependence of photocurrent in a metal-graphene-metal device
Minjung Kim, Ho Ang Yoon, Seungwoo Woo, Duhee Yoon, Sang Wook Lee, and, Hyeonsik Cheong
TL;DR
This study investigates how the photocurrent in a metal-graphene-metal device varies with incident photon polarization, revealing anisotropic electron-photon interactions in graphene that influence photocurrent generation.
Contribution
It demonstrates the polarization dependence of photocurrent in a Pd/graphene/Ti junction and explains it through anisotropic electron-photon interactions in graphene.
Findings
Photocurrent is maximized when polarization is perpendicular to graphene channel.
Photocurrent is minimized when polarization is parallel to graphene channel.
The polarization dependence is due to anisotropic electron-photon interactions in graphene.
Abstract
The dependence of the photocurrent generated in a Pd/graphene/Ti junction device on the incident photon polarization is studied. Spatially resolved photocurrent images were obtained as the incident photon polarization is varied. The photocurrent is maximum when the polarization direction is perpendicular to the graphene channel direction and minimum when the two directions are parallel. This polarization dependence can be explained as being due to the anisotropic electron-photon interaction of Dirac electrons in graphene.
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