2019/02/13 by Sima Pouyandeh, Pouyandeh, Sima, Hadi Z. Olyaei +2
Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph) #Semiconductor Quantum Structures and Devices #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.48550/arxiv.1902.05060
8 pages, 9 figures
arxiv created 2019/02/13 · openalex publication_date 2019/02/13 · arxiv updated 2019/02/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Wavepacket transport across a nonlinear region is studied numerically at zero and finite temperatures. In contrary to the zero temperature case which demonstrates ballistic transport, finite temperature lattice vibrations suppresses the transport drastically. The interface between the linear and the nonlinear chain plays the role of a high barrier at finite temperature when anharmonicity factor is small compared to the typical inverse cubic interatomic distance. Inverse participation ratio of the central region shows that for small anharmonicity and finite temperatures lattice vibrations give rise to self-trapping in the nonlinear chain which lasts for considerable times with a subdiffusive leakage of the wavepacket, almost equally, to both leads. The scenario changes when the anharmonicity becomes comparable with average inverse cubic interatomic distances as the lattice dynamics gives a profound boost to the transmission and starts to be almost transparent for the incoming pulse.