LONG-RANGE CORRELATIONS IN SMALL ATOMIC CLUSTERS

Saroj K. Nayak and R. Ramaswamy
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Saroj K. Nayak: School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India
R. Ramaswamy: School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 457-461

Abstract: We study the power spectrum of fluctuations in the potential energy of atoms in small rare-gas clusters. At temperatures when the cluster is in a liquid-like state the spectra have a“1/f”dependence over a wide range of frequencyf. This behavior is distinctly different from both the solid phase of clusters or bulk liquid, and is indicative of long-range temporal correlations. The origins of this phenomenon is explored by studying the individual potential-energy distributions in pure and mixed rare-gas clusters, Xe55and ArXe54, via molecular dynamics simulations. Substitution of atomic impurities acts as an effective probe of the dynamics, and we observe that long-lived memory effects have their origins in hierarchical relaxation processes arising in the motion of the atoms from the surface to the core and vice-versa.

Date: 1996
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DOI: 10.1142/S0218625X96000826

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