Spin-Wave Theory of Thermal Excitations and Inelastic Scattering in Heisenberg Magnets : New Developments in Compactification and Renormalization

Persistent ID (NDL): info:ndljp/pid/11278775

Material type: 博士論文

Author: 乗木, 優作

Publisher: Hokkaido University

Publication date: 2018-03-22

Material Format: Digital

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Name of awarding university/degree: 北海道大学,博士(理学)

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Note (General)：: We propose a new scheme for modifying conventional spin waves so as to precisely describe low-dimensional Heisenberg magnets at finite temperatures. W...

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Material Type: 博士論文
Title: Spin-Wave Theory of Thermal Excitations and Inelastic Scattering in Heisenberg Magnets : New Developments in Compactification and Renormalization
Author/Editor: 乗木, 優作
Author Heading: 乗木, 優作
Publication, Distribution, etc.: Hokkaido University
Publication Date: 2018-03-22
Publication Date (W3CDTF): 2018-03-22
Alternative Title: Heisenberg 磁性体における熱励起と非弾性散乱のスピン波理論 : コンパクト化と繰り込みの新しい展開
Contributor: 山本, 昌司
根本, 幸児
大原, 潤
吉田, 紘行
Degree grantor/type: 北海道大学
Date Granted: 2018-03-22
Date Granted (W3CDTF): 2018-03-22
Dissertation Number: 甲第13128号
Degree Type: 博士(理学)
Conferring No. (Dissertation): 甲第13128号
Text Language Code: eng
NDC: 400
Target Audience: 一般
Note (General): We propose a new scheme for modifying conventional spin waves so as to precisely describe low-dimensional Heisenberg magnets at finite temperatures. What is called the modified spin-wave theory was initiated by Takahashi, who intended to describe the low-dimensional ferromagnetic thermodynamics. There are various ways for modifying spin waves, especially, in ferrimagnets. Which magnetization should be kept zero, uniform, staggered, or both? One or more chemical potentials can be introduced so as to satisfy the relevant constraint condition either in diagonalizing the Hamiltonian or in minimizing the free energy. We can bring the thus-modified spin waves into interaction on the basis of the Hartree-Fock approximation or through the use of Wick's theorem in an attempt to refine their descriptions. Comparing various modification schemes, we eventually find an excellent bosonic language capable of describing heterogeneous quantum magnets on a variety of lattices over the whole temperature range -- Wick's-theorem-based interacting spin waves modified so as to keep every sublattice magnetization zero via the temperature-dependent Bogoliubov transformation.
(主査) 教授山本昌司, 教授根本幸児, 講師大原潤, 助教吉田紘行
理学院（物性物理学専攻）
DOI: 10.14943/doctoral.k13128
https://doi.org/10.14943/doctoral.k13128
Persistent ID (NDL): info:ndljp/pid/11278775
https://dl.ndl.go.jp/pid/11278775
Collection: 障害者向け資料
Collection (Materials For Handicapped People:1): テキストデータ
Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
https://dl.ndl.go.jp/collections/A00014
Acquisition Basis: 博士論文（自動収集）
Date Accepted (W3CDTF): 2019-05-06T10:27:56+09:00
Date Created (W3CDTF): 2018-03
Format (IMT): PDF
Access Restrictions: 国立国会図書館内限定公開
Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
Availability of remote photoduplication service: 可
Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k13128
http://hdl.handle.net/2115/73151
Is Referenced By (URI): http://hdl.handle.net/2115/69989
Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション
https://dl.ndl.go.jp