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タイトル: | Time-Dependent Approaches to Open Quantum Systems |
著者: | Tokieda, Masaaki Hagino, Kouichi |
著者名の別形: | 萩野, 浩一 |
キーワード: | open quantum systems quantum friction Caldeira-Leggett model barrier transmission fusion reaction |
発行日: | 7-Feb-2020 |
出版者: | Frontiers Media SA |
誌名: | Frontiers in Physics |
巻: | 8 |
論文番号: | 8 |
抄録: | Couplings of a system to other degrees of freedom (that is, environmental degrees of freedom) lead to energy dissipation when the number of environmental degrees of freedom is large enough. Here, we discuss quantal treatments for such energy dissipation. To this end, we discuss two different time-dependent methods. One is to introduce an effective time-dependent Hamiltonian, which leads to a classical equation of motion as a relationship among expectation values of quantum operators. We apply this method to a heavy-ion fusion reaction and discuss the role of dissipation on the penetrability of the Coulomb barrier. The other method is to start with a Hamiltonian with environmental degrees of freedom and derive an equation that the system degree of freedom obeys. For this, we present a new efficient method to solve coupled-channels equations that can be easily applied even when the dimension of the coupled-channels equations is huge. |
著作権等: | © 2020 Tokieda and Hagino. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
URI: | http://hdl.handle.net/2433/252335 |
DOI(出版社版): | 10.3389/fphy.2020.00008 |
出現コレクション: | 学術雑誌掲載論文等 |
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