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Search Results: 1 - 10 of 593239 matches for " J. M. Leinaas "
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Charge and Statistics of Quantum Hall Quasi-Particles. A numerical study of mean values and fluctuations
H. Kj?nsberg,J. M. Leinaas
Physics , 1999, DOI: 10.1016/S0550-3213(99)00353-3
Abstract: We present Monte Carlo studies of charge expectation values and charge fluctuations for quasi-particles in the quantum Hall system. We have studied the Laughlin wave functions for quasi-hole and quasi-electron, and also Jain's definition of the quasi-electron wave function. The considered systems consist of from 50 to 200 electrons, and the filling fraction is 1/3. For all quasi-particles our calculations reproduce well the expected values of charge; -1/3 times the electron charge for the quasi-hole, and 1/3 for the quasi-electron. Regarding fluctuations in the charge, our results for the quasi-hole and Jain quasi-electron are consistent with the expected value zero in the bulk of the system, but for the Laughlin quasi-electron we find small, but significant, deviations from zero throughout the whole electron droplet. We also present Berry phase calculations of charge and statistics parameter for the Jain quasi-electron, calculations which supplement earlier studies for the Laughlin quasi-particles. We find that the statistics parameter is more well behaved for the Jain quasi-electron than it is for the Laughlin quasi-electron.
A Non-linear Sigma-model for Partially Polarized QH-states
T. H. Hansson,A. Karlhede,J. M. Leinaas
Physics , 1996, DOI: 10.1103/PhysRevB.54.R11110
Abstract: We consider a two-component quantum Hall system within a Landau-Ginzburg theory with two Chern-Simons gauge fields. From this theory we derive a sigma model covariantly coupled to one Chern-Simons field and find mean field solutions that could describe partially polarized quantum Hall states. The quasiparticles in the original model, which have quantized charge and spin, are described in the covariant sigma model by topological excitations, with the correct quantum numbers. They have finite energy due to the presence of the Chern-Simons field, and closely resemble the skyrmions in the usual non-linear sigma model. For the fully polarized states the spin is no longer quantized, but determined by Coulomb and Zeeman interactions.
Field theory of anyons in the lowest Landau level
T. H. Hansson,J. M. Leinaas,S. Viefers
Physics , 1994, DOI: 10.1016/0550-3213(96)00178-2
Abstract: We construct a field theory for anyons in the lowest Landau level starting from the $N$-particle description, and discuss the connection to the full field theory of anyons defined using a statistical gauge potential. The theory is transformed to free form, with the fields defined on the circle and satisfying modified commutation relations. The Fock space of the anyons is discussed, and the theory is related to that of edge excitations of an anyon droplet in a harmonic oscillator well.
A Field Theory for Partially Polarized Quantum Hall States
T. H. Hansson,A. Karlhede,J. M. Leinaas,U. Nilsson
Physics , 1998, DOI: 10.1103/PhysRevB.60.4866
Abstract: We propose a new effective field theory for partially polarized quantum Hall states. The density and polarization for the mean field ground states are determined by couplings to two Chern-Simons gauge fields. In addition there is a $\sigma$-model field, $\mh$, which is necessary both to preserve the Chern-Simons gauge symmetry that determines the correlations in the ground state, and the global SU(2) invariance related to spin rotations. For states with non zero polarization, the low energy dynamics is that of a ferromagnet. In addition to spin waves, the spectrum contains topological solitons, or skyrmions, just as in the fully polarized case. The electric charge of the skyrmions is given by $Q_{el}=\nu P Q_{top}$, where $\nu$ is the filling fraction, $P$ the magnitude of the polarization, and $Q_{top}$ the topological charge. For the special case of full polarization, the theory involves a single scalar field and a single Chern-Simons field in addition to the $\sigma$-model field, $\mh$. We also give a heuristic derivation of the model lagrangians for both full and partial polarization, and show that in a mean field picture, the field $\mh$ is necessary in order to take into account the Berry phases originating from rotations of the electron spins.
Exclusion Statistics in a two-dimensional trapped Bose gas
S. Viefers,T. H. Hansson,J. M. Leinaas
Physics , 2001, DOI: 10.1088/0953-4075/34/23/306
Abstract: We briefly explain the notion of exclusion statistics and in particular discuss the concept of an ideal exclusion statistics gas. We then review a recent work where it is demonstrated that a {\em two-dimensional} Bose gas with repulsive delta function interactions obeys ideal exclusion statistics, with a fractional parameter related to the interaction strength.
Exclusion Statistics in a trapped two-dimensional Bose gas
T. H. Hansson,J. M. Leinaas,S. Viefers
Physics , 2000, DOI: 10.1103/PhysRevLett.86.2930
Abstract: We study the statistical mechanics of a two-dimensional gas with a repulsive delta function interaction, using a mean field approximation. By a direct counting of states we establish that this model obeys exclusion statistics and is equivalent to an ideal exclusion statistics gas.
The Quantum Torus Chain
M. P. Qin,J. M. Leinaas,S. Ryu,E. Ardonne,T. Xiang,D. -H. Lee
Physics , 2012, DOI: 10.1103/PhysRevB.86.134430
Abstract: We introduce a new set of one dimensional quantum lattice models which we refer to as The quantum torus chain. These models have discrete global symmetry, and projective on-site representations. They possess an integer-valued parameter which controls the presence or absence of frustration. Depending on whether this parameter is even or odd these models either exhibit gapped symmetry breaking phases with isolated critical points, or gapped symmetry breaking phases separated by gapless phases. We discuss the property of these phases and phase transitions for two special values of the parameter and point out many open problems
Classical phase space and statistical mechanics of identical particles
T. H. Hansson,S. B. Isakov,J. M. Leinaas,U. Lindstrom
Physics , 2000, DOI: 10.1103/PhysRevE.63.026102
Abstract: Starting from the quantum theory of identical particles, we show how to define a classical mechanics that retains information about the quantum statistics. We consider two examples of relevance for the quantum Hall effect: identical particles in the lowest Landau level, and vortices in the Chern-Simons Ginzburg-Landau model. In both cases the resulting {\em classical} statistical mechanics is shown to be a nontrivial classical limit of Haldane's exclusion statistics.
Effective photon-photon interaction in a two-dimensional "photon fluid"
R. Y. Chiao,T. H. Hansson,J. M. Leinaas,S. Viefers
Physics , 2003, DOI: 10.1103/PhysRevA.69.063816
Abstract: We formulate an effective theory for the atom-mediated photon-photon interactions in a two-dimensional ``photon fluid'' confined in a Fabry-Perot resonator. With the atoms modelled by a collection of anharmonic Lorentz oscillators, the effective interaction is evaluated to second order in the coupling constant (the anharmonicity parameter). The interaction has the form of a renormalized two-dimensional delta-function potential, with the renormalization scale determined by the physical parameters of the system, such as density of atoms and the detuning of the photons relative to the resonance frequency of the atoms. For realistic values of the parameters, the perturbation series has to be resummed, and the effective interaction becomes independent of the ``bare'' strength of the anharmonic term. The resulting expression for the non-linear Kerr susceptibility, is parametrically equal to the one found earlier for a dilute gas of two-level atoms. Using our result for the effective interaction parameter, we derive conditions for the formation of a photon fluid, both for Rydberg atoms in a microwave cavity and for alkali atoms in an optical cavity.
Exclusion Statistics in Classical Mechanics
T. H. Hansson,S. B. Isakov,J. M. Leinaas,U. Lindstrom
Physics , 2000,
Abstract: We present a general method to derive the classical mechanics of a system of identical particles in a way that retains information about quantum statistics. The resulting statistical mechanics can be interpreted as a classical version of Haldane's exclusion statistics.
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