SKM 2021 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 2: Materials for Energy Storage
KFM 2.2: Vortrag
Dienstag, 28. September 2021, 11:30–11:45, H5
Thermoelectric properties of novel semimetals: A case study of YbMnSb2 — •Yu Pan1, Feng-Ren Fan1, Xiaochen Hong2, Bin He1, Congcong Le1, Walter Schnelle1, Yangkun He1, Kazuki Imasato3, Horst Borrmann1, Christian Hess2, Bernd Büchner2, Yan Sun1, Chenguang Fu1, Jeffrey Snyder3, and Claudia Felser1 — 1Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany — 2Leibniz-Institute for Solid State and Materials Research (IFW-Dresden), Helmholtzstraße 20, Dresden 01069, Germany — 3Materials Science & Engineering (MSE), Northwestern University, Evanston, IL 60208, USA
The emerging class of topological materials provides a platform to engineer exotic electronic structures for a variety of applications. As complex band structures and Fermi surfaces can directly benefit thermoelectric perfor-mance it is important to identify the role of featured topological bands in thermoelectrics particularly when there are coexisting classic regular bands. In this work, the contribution of Dirac bands to thermoelectric performance and their ability to concurrently achieve large thermopower and low resistivity in novel semimetals is investigated. By examining the YbMnSb2 nodal line semimetal as an example, the Dirac bands appear to provide a low resistivity along the direction in which they are highly dispersive. Moreover, because of the regular-band-provided density of states, a large Seebeck coefficient is achieved. The present work highlights the potential of such novel semimetals for high thermo-electric performance.