Towards an on-chip terahertz acoustic wave source based on graphene devices.

ORAL

Abstract

In graphene devices, the electronic drift velocity can easily exceed the speed of sound in the material at moderate current biases. Under this condition, stimulated phonon emission dominates over absorption and can produce an exponential growth of the phonon population in the direction of the carrier flow. Here, we demonstrate that phonon amplification can significantly affect the electrical properties of long clean graphene devices, increasing its resistivity up to 7 times over a distance of 8 microns. These effects are observable at a wide range of carrier densities (0.5×1012 to 4×1012 cm-2) and at temperatures from 1.5 to 280 K. Due to the ease of reaching the emission condition, phonon amplification should be considered when measuring electrical transport in long graphene devices. These findings could lead to a new method of room temperature on-chip generation and detection of acoustic waves in the THz frequency range.

*UC MEXUS-CONACYT

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Publication: Towards an on-chip terahertz acoustic wave source based on graphene devices.

Presenters

  • Aaron H Barajas Aguilar

    • University of California, Irvine

Authors

  • Aaron H Barajas Aguilar

    • University of California, Irvine

  • Jasen Zion

    • Caltech

  • Ian Sequeira

    • University of California, Irvine

  • Andrew Barabas

    • University of California, Irvine

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Javier Sanchez-Yamagishi

    • University of California, Irvine