Roton-Like Excitation in Quantum Lattice Model

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概要

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• The ground state of a Quantum Lattice Model (QLM) in which all atoms are quanturn-mechanically migrating from site to site on the lattice points is given in thecrudest approximation. From the QLM the energy spectrum of roton-like excitationis derived on the basis of a simple picture, where the roton excitation is regarded asthe motion of an atom which does not undergo the quantum migration. According toMatsuda and Matsubara, by setting two parameters, the effective mass of QLMm=(1 / 7)m. (m. is the mass of 'He atom), and the lattice spacing #=3.1 A, the density dependence of ,l and m' in roton spectrum are calculated. The obtained resultsare somewhat higher than the experiments. However the tendencies of densitydependence of these parameters are in an excellent agreement with the experiments.

• 一般社団法人日本物理学会の論文
• 1988-06-15

著者

• Aoki Tosizumi

  Gunma College Of Technology

関連論文

• Spin Correlation Functions in the Large-α Region of the Square-Lattice J_1-J_2 Model (General)
• Kinematical Interaction between S=1/2 Spins in the Two-time Spin Green's Function Method : General Physics
• Spin-Wave Theory of the Triangular-Lattice Heisenberg Antiferromagnet
• Green's Function Approach to the Modified Quantum Heisenberg Model
• Spin-Wave Theory of the Square-Lattice Heisenberg Antiferromagnet
• Spin-Wave Theory of Modified Quantum Heisenberg Model
• Roton-Like Excitation in Quantum Lattice Model

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