Authors:
- Nominated as an outstanding Ph.D. thesis by The University of Tokyo’s Applied Physics Department in 2013
- Presents basic studies for applications to electrically controlled magnetic memory devices or high-efficiency thermoelectrics
- Describes the emergence of novel quantum states, skyrmions, and Dirac electrons in B20-type germanium compounds
- Includes supplementary material: sn.pub/extras
Part of the book series: Springer Theses (Springer Theses)
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Table of contents (7 chapters)
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Front Matter
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Back Matter
About this book
This thesis presents systematic experimental research on chiral-lattice crystals referred to as B20-type germanium compounds, especially focusing on skyrmion spin textures and Dirac electrons. An emergent electromagnetic field observed in MnGe demonstrates a formation of three-dimensional skyrmion crystals. Detection of skyrmions in nanoscale Hall bar devices made of FeGe is realized by measuring the topological Hall effect, a transport property reflecting emergent fields produced by skyrmions. By measuring the electron-filling dependence of thermopower in CoGe, a pronounced thermoelectric property in this compound is revealed to stem from the asymmetric density of states appearing at certain levels of Fermi energy in the Dirac electron state.
The three main results named above will contribute to enriching a variety of novel electromagnetic responses of emergent gauge fields in solids, to realizing high-performance skyrmion-based magnetic memory, and to designing high-efficiency thermoelectric materials, respectively.Authors and Affiliations
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Department of Applied Physics, The University of Tokyo, Tokyo, Japan
Naoya Kanazawa
About the author
Department of Applied Physics, University of Tokyo
kanazawa@ap.t.u-tokyo.ac.jp
Bibliographic Information
Book Title: Charge and Heat Transport Phenomena in Electronic and Spin Structures in B20-type Compounds
Authors: Naoya Kanazawa
Series Title: Springer Theses
DOI: https://doi.org/10.1007/978-4-431-55660-2
Publisher: Springer Tokyo
eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)
Copyright Information: Springer Japan 2015
Hardcover ISBN: 978-4-431-55659-6Published: 13 August 2015
Softcover ISBN: 978-4-431-56306-8Published: 23 October 2016
eBook ISBN: 978-4-431-55660-2Published: 31 July 2015
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition Number: 1
Number of Pages: XII, 89
Number of Illustrations: 8 b/w illustrations, 52 illustrations in colour
Topics: Strongly Correlated Systems, Superconductivity, Surface and Interface Science, Thin Films, Quantum Gases and Condensates, Surfaces and Interfaces, Thin Films