Deriving Internal Energy by Virtue of Generalized Feynman-Hellmann Theorem for Mixed States
Deriving Internal Energy by Virtue of Generalized Feynman-Hellmann Theorem for Mixed States作者机构：Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Special Class for Gifted Young University of Science and Technology of China Hefei 230026 China
出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)
年 卷 期：2005年第44卷第6X期
页 面：1041-1044页
核心收录：
学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学]
基 金：the National Natural Science Foundation of China under
主 题：generalized Feynman-Hellmann theorem internal energy mixed state
摘 要：We show how to directly use the generalized Feynman-Hellmann theorem, which is suitable for mixed state ensemble average, to derive the internal energy of Hamiltonian systems. A concrete example, which is a two coupled harminic oscillators, is used for elucidating our approach.
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