Anomalous Heat Conduction in One-Dimensional Quantum Fermi-Pasta-Ulam Lattice: Semiquantal Approach

doi:10.1143/JPSJ.79.064601

	Anomalous Heat Conduction in One-Dimensional Quantum Fermi-Pasta-Ulam Lattice: Semiquantal Approach
	Hu, Tao 1; Tang, Yi
刊名	JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
	2010-06-01
卷号	79 页码:7
关键词	heat conduction thermal transport semiquantal approach nonlinear lattices
ISSN号	0031-9015
DOI	10.1143/JPSJ.79.064601
英文摘要	We investigate the mechanism of heat conduction in one-dimensional (1D) quantum FPU chain with quantum fluctuation in the framework of semiquantal molecular dynamics. In the semiquantal many-body simulations, a Hartree-type many-body wave function is adopted for a whole chain and a single-particle state of a particle is represented by a trial wave function with Jackiw-Kerman (JK) form. With the help of the Dirac's time-dependent variational principle (TDVP), a set of equations of the variational parameters contained in the JK wave packet is obtained, and it describes the quantum dynamics of the nonlinear lattices approximately. These equations not only prove highly efficient in recovering dynamics of classical heat conduction, but also allow exploring the case with quantum mechanical characteristics. As a consequence, we find the thermal conductivity diverges with system size as well as in the classical version when considering quantum fluctuation. Furthermore, in three different temperature regions it is observed that the enhancement of the quantum fluctuation increases the heat flux through the 1D quantum FPU chain.
WOS关键词	FRENKEL-KONTOROVA MODEL ; WAVE-PACKET DYNAMICS ; THERMAL-CONDUCTIVITY ; MOLECULAR-DYNAMICS ; CARBON NANOTUBES ; STATE ; SYSTEM ; APPROXIMATION ; CHAOS
WOS研究方向	Physics
语种	英语
出版者	PHYSICAL SOC JAPAN
WOS记录号	WOS:000278513100011
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/32461]
专题	中国科学院近代物理研究所
通讯作者	Hu, Tao
作者单位	1.Xiangtan Univ, Dept Phys, Xiangtan 411105, Hunan, Peoples R China 2.Xiangtan Univ, Inst Modern Phys, Xiangtan 411105, Hunan, Peoples R China
推荐引用方式 GB/T 7714	Hu, Tao,Tang, Yi. Anomalous Heat Conduction in One-Dimensional Quantum Fermi-Pasta-Ulam Lattice: Semiquantal Approach[J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN,2010,79:7.
APA	Hu, Tao,&Tang, Yi.(2010).Anomalous Heat Conduction in One-Dimensional Quantum Fermi-Pasta-Ulam Lattice: Semiquantal Approach.JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN,79,7.
MLA	Hu, Tao,et al."Anomalous Heat Conduction in One-Dimensional Quantum Fermi-Pasta-Ulam Lattice: Semiquantal Approach".JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79(2010):7.