## 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 285

Under these conditions we expect, for the isolated system, a phenomenon similar

to the inversion resonance well known in the ammonia

system in (say) the left-hand well, then the probability to find it at any subsequent

...

Under these conditions we expect, for the isolated system, a phenomenon similar

to the inversion resonance well known in the ammonia

**molecule**: if we start thesystem in (say) the left-hand well, then the probability to find it at any subsequent

...

Page 288

Firstly, we can, at least in principle, use the same physical system, or a slight

modification of it, to look for all the various effects discussed above (instead of, for

example, having to use heavy nuclei for MQT, the ammonia

etc.) ...

Firstly, we can, at least in principle, use the same physical system, or a slight

modification of it, to look for all the various effects discussed above (instead of, for

example, having to use heavy nuclei for MQT, the ammonia

**molecule**for MQC,etc.) ...

Page 404

The impurities are double-valence fluctuating

state is degenerate with the doubly occupied state. They mediate a pairing

interaction between conduction electrons. If this interaction is strong enough,

then the ...

The impurities are double-valence fluctuating

**molecules**in which the unoccupiedstate is degenerate with the doubly occupied state. They mediate a pairing

interaction between conduction electrons. If this interaction is strong enough,

then the ...

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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