84,433 research outputs found
Structural transformation and localization during simulated nanoindentation of a non-crystalline metal film
A simulation study demonstrates that localization can arise as the result of
the breakdown of stable quasi-crystal-like atomic configurations. Samples
produced at elevated quench rates and via more energetic processes contain a
lower fraction of such configurations and exhibit significantly less pronounced
localization and shorter spacing between bands. In the samples produced by the
lowest quench rates localization is accompanied by the amorphization of
material with initially quasi-crystal-like medium range order. This result is
of particular significance in light of recent experimental evidence of local
quasi-crystal order in the most stable of the bulk metallic glasses.Comment: 13 pages, 3 figure
On the KP Hierarchy, Algebra, and Conformal SL(2,R)/U(1) Model: II. The Quantum Case
This paper is devoted to constructing a quantum version of the famous KP
hierarchy, by deforming its second Hamiltonian structure, namely the nonlinear
algebra. This is achieved by quantizing the conformal
noncompact coset model, in which appears
as a hidden current algebra. For the quantum algebra at
level , we have succeeded in constructing an infinite set of commuting
quantum charges in explicit and closed form. Using them a completely integrable
quantum KP hierarchy is constructed in the Hamiltonian form. A two boson
realization of the quantum currents has played a crucial
role in this exploration.Comment: 33
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