Titlebook: Recent Progress in MANY-BODY THEORIES; A. J. Kallio,E. Pajanne,R. F. Bishop Book 1988 Plenum Press, New York 1988 X-Ray.glass.liquid.many-

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The Two-Dimensional Hubbard Model: Numerical Evaluation of the Properties of Projected AntiferromagnThe paramagnetic state is found to be stable against s-wave pairing but unstable against d-wave pairing. No (pairing energy) effect is found for the antiferromagnetic case. The calculations were done by evaluating numerically the properties of the wavefunction with a new method, which made it possib

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Excitations in the Fractional Quantum Hall Effect at ν=1/2: Layered Electron Systemsided us with a unique many-body phenomenon. Recent years have seen quite impressive experimental. and theoretical. developments in this field. Following the seminal work by Laughlin., the ground - state and elementary excitations of an . electron fluid, have been studied by various theoretical techn

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Solitons in Disordered Systems or Application of Catastrophe Theory to Solitonsally speaking the answer to the question of the existence and stability of solition can be found by means of the mathematical theory of the singularity function, which is usually called as the catastrophe theory [2]. From the point of view of this theory we construct some functional in the functiona

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Magnetoconductance of Two Dimensional Disordered Systems) vanishes identically as a result of unitarity (but this does not imply that the Hall voltage vanishes), σ.(B) decreases monotonically with magnetic field without any oscillation with period of the quantum flux, and for weak impurity scattering <σ.(B)> is smaller (larger) than the impurity free sam

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