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Helvetica Physica Acta

Helvetica Physica Acta Band 65 (1992)
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Heft 1 1
Artikel: Complete sets of compatible non selfadjoint observables 1
Artikel: Asymptotic expansion of the Stark-Wannier states 11
Artikel: Perturbative renormalization and effective Langrangians in Φ^4_4 32
Artikel: Unitary time evolution for irregular external field problems 53
Artikel: Diffusive repair for the Ginzburg-Landau equation 56
Artikel: Stability of needle-crystals in the symmetric model of solidification 93
Vereinsnachrichten: Rapport de la réunion d'automne de la SSP 109
Heft 2-3 131
Artikel: Facts and fantasies in FQHE theory 133
Artikel: Two recent experiments on the fractional quantized Hall effect 143
Artikel: Edge voltages and distributed currents in the quantum Hall effect 151
Artikel: Edge states in the quantum Hall effect as generalized fermi surface singularities 152
Artikel: Surface acoustic wave studies of the fractional quantum Hall regime 153
Artikel: Quantum Hall effect without Landau quantization 164
Artikel: Theories of superconductivity (a few remarks) 173
Artikel: Two-dimensional superconductivity in ultrathin disordered thin films 187
Artikel: Quenching of superconductivity in disordered thin films by phase fluctuations 197
Artikel: Superconductivity in quasi-two-dimensional systems : theoretical aspects 205
Artikel: Superlattices of hits cuprates : investigations of 2D ultrathin layers and the crossover to 3D anisotropic films 215
Artikel: Anyons in the quantized Hall effect and in models of high temperature superconductors 218
Artikel: Josephson junction arrays and superconducting wire networks 219
Artikel: Charge-vortex duality in Josephson junction arrays 228
Artikel: The flux-phase problem on planar lattices 247
Artikel: SO(4) symmetry of the Hubbard model and its experimantal consequences 256
Artikel: Quantum-Monte-Carlo studies of superconductivity in strongly correlated systems 257
Artikel: Exact diagonalization studies of 2D quantum models 268
Artikel: Quantum Monte Carlo simulations : algorithms, limitations and applications 278
Artikel: Conformal field theory and statistical mechanics 289
Artikel: Mathematical survey of some two dimensional dynamical systems 290
Artikel: Statistical mechanics on a 2D-random surface 291
Artikel: Experiments on melting in classical and quantum two dimensional electron systems 297
Artikel: After-dinner speech on board the ship "Ville de Neuchâtel" 307
Artikel: Point-contact spectroscopy on tunable constrictions in GaAs 313
Artikel: Violation of Ehrenfest's theorem in particle dynamics of quantum Hall systems 315
Artikel: Multifractality and scaling in disordered 2-D Landau levels 317
Artikel: Hysteresis effects in mesoscopic rings in the quantum Hall regime 319
Artikel: Quantum fluctuations in the transmission of a ballistic metallic constriction 321
Artikel: Excitonic recombination of Donor bound excitons in selectively doped MQW under high magnetic fields 323
Artikel: The magnetoconductance of the 2d systems of electrons on liquid helium in the extreme quantum limit 325
Artikel: Quenching of the Hall effect in two dimensional narrow systems 327
Artikel: Exchange and polariton effects for excitons in Al_1-xGa_xAs-GaAs quantum wells 329
Artikel: Imaging the current distribution in the quantum Hall effect 331
Artikel: Electron phonon interactions in a disordered 2d electron gas in a magnetic field 333
Artikel: Coulomb blockade in a 2d electron gas 335
Artikel: Incompressible quantum liquid versus two-dimensional electron solid 337
Artikel: Two-dimensional channel from Ga_0.65Al_0.35As-GaAs undoped heterojunction 339
Artikel: The role of edge currents in dissipative transport at strong magnetic fields 341
Artikel: Resonant Raman scattering in quantum wells under high magnetic fields 343
Artikel: FQHE in the disk geometry : exact diagonalization for few electrons and extrapolation to the bulk limit 345
Artikel: Determination of electron exchange energy in a 2DES by nuclear magnetic relaxation 347
Artikel: On the theory of kinetic properties of perfect two-dimensional conducting systems 349
Artikel: Hydrodynamic effects in electric conductivity of two dimensional metals 351
Artikel: Magnetotransport in 2D system in parallel and tilted magnetic fields 353
Artikel: Theory of 2D conductivity in almost parallel magnetic fields : the role of the third dimension 355
Artikel: Current dependence of the Shubnikov-de Haas peaks in GaAs - Al_xGa_1-xAs heterostructures 357
Artikel: Non-locality of the gapless plasma excitations in the QHE 359
Artikel: Universal dependence of eigenvectors of tight-binding models on Bloch momenta 361
Artikel: Plasmaron excitation in a 2D electron gas 363
Artikel: Magnetically catalyzed superconductivity in 2D 367
Artikel: What symmetry is broken in the superconductor - normal phase transition? 369
Artikel: The effects of inherent bond disorder on the rf properties of SNS Josephson junction arrays 371
Artikel: Self-field effects and subharmonic Shapiro steps in Josephson junction arrays 373
Artikel: Vortex motion in type II superconductors of reduced dimensionality 375
Artikel: Charge dynamics in junction arrays 379
Artikel: Quantum phase transitions in Josephson junction arrays 381
Artikel: Propagating vortex beams in Josephson-junction arrays 383
Artikel: Observing an Ising transition in Josephson-junction arrays 385
Artikel: Optical response of CuO_2-plane and CuO-chain in YBaCuO 387
Artikel: Zero applied force magnetic flux noise in Josephson junction arrays 389
Artikel: Vortex dynamics in superconducting fractal networks 391
Artikel: Two-dimensional electron localization in bulk single crystals of Bi_2Sr_2Ca_1-xY_xCu_2O_8 393
Artikel: Giant tunneling anisotropy of a high temperature superconductor 395
Artikel: Imaging the current density in superconducting thin films 397
Artikel: Flux creep : the stochastic approach 399
Artikel: Temperature dependence of critical current and activation energy due to layered structure in oxide superconductors 402
Artikel: 2D de Haas-van Alphen effect in the superconducting state 404
Artikel: Experimental investigation of two-dimensional arrays of ultrasmall Josephson junctions 406
Artikel: Crossover from three- to two-dimensional behavior of the vortex energies in layered XY-models for high T_c superconductors 408
Artikel: Nonperturbatively renormalizable quantum field theories in 2+1 dimensions 411
Artikel: Anharmonic phonons and electronic correlations in high-T_c superconductors : a quantum Monte Carlo study 413
Artikel: Corrections to fermi liquid behaviour in D=2 : DOS 415
Artikel: Monte Carlo simulation of the 1D-quantum roughening model : evidence of a KTB transition 417
Artikel: Dynamics of spin and charge fluctuations in a t-J model 419
Artikel: Dynamics of charge carriers in 2-D quantum antiferromagnets 421
Artikel: Slave Boson approach to magnetic order in the Hubbard model 423
Artikel: Critical behaviour at the metal-insulator transition in 2D systems with spin orbit scattering 425
Artikel: SO(3)-σ model of doped two-dimensional spin 1/2 Heisenberg antiferromagnet 427
Artikel: Order and fluctuations in coupled XY planes 429
Artikel: Single-particle spectrum for high-T_c superconductors : a numerical study 431
Artikel: Conserving approximation for the multi-band Hubbard model 433
Artikel: Finite-size effects in the negative U Hubbard model 435
Artikel: Ground state phase diagram of the two-dimensional Kondo lattice 437
Artikel: Numerical study of a projected Hubbard model 439
Artikel: The phase diagram of the Haldane chain mapped onto the surface roughening problem 441
Artikel: Lyapunov exponents of the Schrödinger equation with quasi-periodic potential on a strip 443
Artikel: Singular dynamics of a fermion coupled to the planar antiferromagnet 446
Artikel: Antiferromagnets in 2 + ε dimensions 448
Artikel: Superconductivity of the mixed s and d-type symmetry in the t-J model 450
Artikel: The hole excitation spectrum in CuO_2 plane 452
Artikel: Magnetic properties of the Hubbard model with infinite interaction 454
Artikel: Resonance (surface) phonon transport through point contacts 456
Artikel: Low temperature properties of two dimensional frustrated quantum antiferromagnets 458
Artikel: Kinetic roughening in molecular-beam epitaxy 463
Artikel: Two-dimensional spin systems in a magnetic field close to criticality 465
Artikel: Vortex and domain wall dynamics of 2d-XY model with in-plane magnetic field 467
Artikel: Jones polynomial and the Potts model 469
Artikel: Dynamics of defects near melting of classical 2D electrons 471
Artikel: Two-dimensional melting of hexatic magnetic bubble arrays 473
Artikel: Statistical properties of 2D periodic Lorentz gas with infinite horizon 475
Artikel: Is the Kosterlitz-Thouless transition 'exotic'? 477
Artikel: Vortices : collective variables for turbulence in Josephson arrays 479
Artikel: Frustrated XY model : continuity of the ground state energy in function of the frustration 482
Artikel: Crossover from two to three dimensions in the layered xy-model 484
Artikel: High resolution photoemission investigation of phase transitions in 1T-TaS_2 486
Artikel: Superconducting vortices and the two-dimensional electron gas 488
Artikel: One electron dimple on a thin helium film 490
Artikel: Destruction of superconductivity in Josephson junction arrays by positional disorder 492
Artikel: Chaotic dynamics of fluxons in large-area Josephson junctions 494
Artikel: Soliton mechanism of optical anisotropy photoinduction in layered molecular structures 497
Artikel: Vortex corrections to the SCHA in the 2D-XY model 499
Artikel: Long-time dynamics of two-dimensional fluid binary mixture in cellular automata models 501
Register: Index of authors 503
Heft 4 505
Artikel: Subordinacy and spectral theory for infinite matrices 505
Artikel: Perturbation theory for time dependent hamiltonians : rigorous reduction theory 528
Artikel: Heisenberg antiferromagnet on triangulated trees 560
Artikel: Critical points of the "entropy"-like functional for the quantum distribution functions 596
Artikel: Antinucleon-nucleon scattering formalism and possible tests of CPT invariance 611
Heft 5 641
Artikel: Classical theories, atomicity and nonclassical theories 641
Artikel: Finite temperature Schwinger model 652
Artikel: An infinite volume expansion for many fermion Green's functions 679
Artikel: Approximation semi-classique du propagateur d'un système électromagnétique et phénomène de Aharonov-Bohm 722
Artikel: Semiclassical expansions of the thermodynamic limit for a Schrödinger equation. II, The double well case 748
Heft 6 767
Article: Instability of SU(2) Einstein-Yang-Mills solitons and non-abelian black holes 767
Association News: Rapport de la réunion d'automne de la SSP 820
Issue 7 887
Article: Complete sets of commuting observables and irreducible sets of observables 887
Article: A Lorentz covariant description of the classical radiation field 898
Article: On the description of single massless quantum objects 910
Article: Michel's theorem and critical sections of gauge functionals 922
Article: First order coherent Boson states 965
Article: Diffusion in the kicked quantum rotator by random corrections to a linear and sine field 985
Issue 8 993
Article: Chiral current algebras in three-dimensional BF-theory with boundary 993
Article: Fierz transformation and dimensional regularization 1011
Article: Local dynamics of mean-field quantum systems 1016
Article: Defining relative energies for the projected Ising measure 1055
Article: Algebraic treatment of the Morse potential 1069
Article: Résonances pour l'opérateur de DIRAC-II 1077
Article: On the definition of time delay in scattering theory 1119
Table of Contents 1127
Index: Index of authors = Autorenregister = Table des auteurs 1135