Excess of low-frequency modes in Lennard-Jones systems

by: Alberto D Santis, Alessandro Ercoli, Dario Rocca

Journal of Physics: Condensed Matter, Vol. 14, No. 22. (2002), pp. L393-L398.

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摘要

Argon dynamics is simulated in the glassy state at the temperature of 20 K. A fast quenching is used to study the slow time evolution from the glass to the crystalline state. Observation of the crystallization process reveals the growth of temperature, a rapid change in the mean square displacement, and strong variations in the relative pair dynamics. Our main results are: (a) detecting the presence of a low-frequency mode in the pair dynamics of the glass; (b) showing that this mode is responsible for the intensity excess at low frequency in the power spectrum (compared to that of the crystal); and (c) showing that it decreases more and more as the crystallization proceeds.

@article{citeulike:2998098, abstract = {Argon dynamics is simulated in the glassy state at the temperature of 20 K. A fast quenching is used to study the slow time evolution from the glass to the crystalline state. Observation of the crystallization process reveals the growth of temperature, a rapid change in the mean square displacement, and strong variations in the relative pair dynamics. Our main results are: (a) detecting the presence of a low-frequency mode in the pair dynamics of the glass; (b) showing that this mode is responsible for the intensity excess at low frequency in the power spectrum (compared to that of the crystal); and (c) showing that it decreases more and more as the crystallization proceeds.}, author = {Santis, Alberto D. and Ercoli, Alessandro and Rocca, Dario }, citeulike-article-id = {2998098}, doi = {http://dx.doi.org/10.1088/0953-8984/14/22/102}, journal = {Journal of Physics: Condensed Matter}, number = {22}, pages = {L393--L398}, posted-at = {2008-07-14 06:58:19}, priority = {2}, title = {Excess of low-frequency modes in Lennard-Jones systems}, url = {http://dx.doi.org/10.1088/0953-8984/14/22/102}, volume = {14}, year = {2002} }

RIS record

TY - JOUR ID - citeulike:2998098 L3 - citeulike-article-id:2998098 N2 - Argon dynamics is simulated in the glassy state at the temperature of 20 K. A fast quenching is used to study the slow time evolution from the glass to the crystalline state. Observation of the crystallization process reveals the growth of temperature, a rapid change in the mean square displacement, and strong variations in the relative pair dynamics. Our main results are: (a) detecting the presence of a low-frequency mode in the pair dynamics of the glass; (b) showing that this mode is responsible for the intensity excess at low frequency in the power spectrum (compared to that of the crystal); and (c) showing that it decreases more and more as the crystallization proceeds. IS - 22 JF - Journal of Physics: Condensed Matter EP - L398 TI - Excess of low-frequency modes in Lennard-Jones systems VL - 14 SP - L393 AU - Santis, Alberto AU - Ercoli, Alessandro AU - Rocca, Dario PY - 2002/// UR - http://dx.doi.org/10.1088/0953-8984/14/22/102 ER -

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