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- Aoki Tosizumi
- Department of Applied Physics, Faculty of Engineering, Nagoya University
書誌事項
- タイトル別名
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- Phonon Excitation in Quantum Lattice Mo
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抄録
From the calculation of macroscopic sound velocity based upon the free energy derived by Matsubara and Matsuda within the molecular field approximation, it is shown that the ordinary spin waves of the Quantum Lattice Model (QLM) or the XY model do not directly correspond to the phonon excitation of liquid 4He. Instead of the spin waves, a new excitation with the usual macroscopic sound velocity is derived from the motion of the number operator, where the motion is taken into account to the second order in the time derivative within the effective-field approximation. The present calculation implies the possibility that the similar excitation exists in the one- or two-dimensional XY model which does not exhibit a long-range order.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 56 (6), 2094-2097, 1987
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679164201344
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- NII論文ID
- 110001960464
- 210000093380
- 130003899476
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- NII書誌ID
- AA00704814
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- BIBCODE
- 1987JPSJ...56.2094A
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 3139598
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可