## 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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Page 24

The two do not cause independent excitations. One cannot, however, identify

them from the start, though one is tempted to, since then the constraint is simply

the anticommutation relation of the resulting single

them ...

The two do not cause independent excitations. One cannot, however, identify

them from the start, though one is tempted to, since then the constraint is simply

the anticommutation relation of the resulting single

**fermion**; one must identifythem ...

Page 394

3, this approach was used to study 2-D spinless [22]

as large as 12 Xl2, the 2-D Hubbard model [25] on 8x8 and the 3-D Hubbard

model [26] on 4x4x4 and some 6x6x6 lattices. Using the hybrid approach

discussed ...

3, this approach was used to study 2-D spinless [22]

**fermions**on spatial latticesas large as 12 Xl2, the 2-D Hubbard model [25] on 8x8 and the 3-D Hubbard

model [26] on 4x4x4 and some 6x6x6 lattices. Using the hybrid approach

discussed ...

Page 414

B.2. Spinless

Hamiltonian & ,..t t (B.7) H = – t X (c. c.11 + c', c.). t=1 This model is of particular

interest, both because of its equivalence to the onedimensional XY model

through ...

B.2. Spinless

**fermion**model. – We consider a one-dimensional periodic**fermion**Hamiltonian & ,..t t (B.7) H = – t X (c. c.11 + c', c.). t=1 This model is of particular

interest, both because of its equivalence to the onedimensional XY model

through ...

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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