## Frontiera E Confini Della Fisica Di Molte ParticelleR. A. Broglia, John Robert Schrieffer, Società italiana di fisica Subjects at the forefront of many-particle research, like high-temperature superconductivity, the quantum Hall effect, heavy fermions, tunneling of quantal systems with many degrees of freedom, Monte Carlo calculations on a lattice etc., were presented. The meeting was well timed as it coincided with a very active period of research in the study of superconductivity and thus provided an excellent opportunity to assess some of the major developments that have taken place in the last years. |

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Results 1-3 of 77

Page 69

The results of the continuum hopping

are shown in table II. We see that the treatment works surprisingly well,

considering the number of

collective ...

The results of the continuum hopping

**approximation**for the spin barrier modelare shown in table II. We see that the treatment works surprisingly well,

considering the number of

**approximations**made. Very far below the barrier, thecollective ...

Page 171

There are a number of exact results known in the limit of strong repulsion which

can be used to test the

number of essentially similar

There are a number of exact results known in the limit of strong repulsion which

can be used to test the

**approximations**. ... by Rice and Ueda [3] — is but one of anumber of essentially similar

**approximation**schemes developed for this model.Page 180

Note that in 1 dimension this

results with that in the Gutzwiller

conclusions. Firstly, it is clear that the Gutzwiller

Heisenberg ...

Note that in 1 dimension this

**approximation**is exact. If we compare now theseresults with that in the Gutzwiller

**approximation**, we can come to severalconclusions. Firstly, it is clear that the Gutzwiller

**approximation**neglects theHeisenberg ...

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### Contents

insula | 1 |

EVB theory such as it is | 14 |

Formal theories of EVB and highT0 superconductivity | 20 |

Copyright | |

21 other sections not shown

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### Common terms and phrases

amplitude angular momentum approximation band barrier behavior calculated charge classical configuration correlation Coulomb coupling cross-section defined deformation degrees of freedom density described dipole discussed dynamics edited effect eigenstates electron equation of motion excitation energy exciton expectation value experimental factor Fermi energy Fermi liquid Fermi surface fermion finite fluctuations gauge given Green's function Gutzwiller Hamiltonian Hartree heavy-ion hole Hubbard model inertia interaction Landau lattice Laughlin Lett limit linear magnetic field mass matrix element mean-field Monte Carlo neutrons nuclear nucleon nucleus obtained orbital oscillator P. W. ANDERSON pairing parameter particle path integral phase Phys physics potential problem quadrupole quantity quantum quasi-particle R. A. BROGLIA relativistic renormalized resonance rotational frequency sect shown in fig simulation single-particle spin spinon superconductivity symmetry temperature term theory tion tonian transition tunnelling variable vector wave function yrast zero