Reduced density matrix approach to phononic dissipation in friction
Reduced density matrix approach to phononic dissipation in friction
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DOI：
10.1103/physrevb.62.10558
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发表时间：
2000-10-15
影响因子：
3.7
通讯作者：
Ciraci, S
中科院分区：
文献类型：
--
作者：
Özpineci, A;Leitner, DM;Ciraci, S
Understanding mechanisms for energy dissipation from nanoparticles in contact with large samples is a central problem in describing friction microscopically. Calculation of the reduced density matrix appears to be the most suitable method to study such systems that are coupled to a large environment. In this paper, the time evolution of the reduced density matrix has been evaluated for an arbitrary system coupled to a heat reservoir. The formalism is then applied to study the vibrational relaxation following the stick-slip motion of an asperity on a surface. The frequency and temperature dependence of the relaxation time is also determined. Predictions of the reduced density matrix are compared with those obtained by using the Golden Rule approach.
