Angle-resolved photoemission spectroscopy study of n-type Bi$_2$Te$_3$

ORAL

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) studies of $n$-type Bi$_2$Te$_3$, which is a classical thermoelectric compound that shows high figure of merit (ZT) at room temperature. Band dispersions for major high symmetry directions were obtained and all the conduction bands were determined from the ARPES data. An ellipsoidal electron pocket was identified and the result is compared with that of de Haas-van Alphen effect. We also estimate the ZT value from ARPES data and discuss the origin of the high ZT value in connection with electronic structure.

–

Authors

  • Han-Jin Noh

    Center for Strongly Correlated Materials Research, Seoul National University, SNU/POSTECH

  • H. Koh

    CSCMR, SNU

  • S.-J. Oh

    School of Physics and CSCMR, SNU, SNU

  • J.-H. Park

    Department of Physics, Pohang University of Science and Technology, POSTECH

  • Tonica Valla

  • Peter Johnson

    Physics Department, Brookhaven National Laboratory, Brookhaven National Laboratory