Phonon transmission and thermal conductance in one-dimensional system with on-site potential disorder |
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Authors: | Songshan Ma Hui XuHonggui Deng Bingchu Yang |
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Institution: | School of Physics Science and Technology, Central South University, Changsha 410083, China |
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Abstract: | The role of on-site potential disorder on phonon transmission and thermal conductance of one-dimensional system is investigated. We found that the on-site potential disorder can lead to the localization of phonons, and has great effect on the phonon transmission and thermal conductance of the system. As on-site potential disorder W increases, the transmission coefficients decrease, and approach zero at the band edges. Corresponding, the thermal conductance decreases drastically, and the curves for thermal conductance exhibit a series of steps and plateaus. Meanwhile, when the on-site potential disorder W is strong enough, the thermal conductance decreases dramatically with the increase of system size N. We also found that the efficiency of reducing thermal conductance by increasing the on-site potential disorder strength is much better than that by increasing the on-site potential?s amplitude. |
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Keywords: | Phonon transmission Thermal conductance On-site potential disorder One-dimensional system |
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