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    Wyświetlanie 1-14 z 14
    Tytuł:
    Excitations of the Moore-Read ν=$\frac{5}{2}$ State: Three-Body Correlations and Finite-Size Effects on a Sphere
    Autorzy:
    Wόjs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038124.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    Correlations in partially filled electron and composite fermion Landau levels are studied numerically. Insight into the nature of the correlations is obtained by using model pair pseudopotentials. Energy spectra of a model short-range three-body repulsion are calculated. Moore-Read ground state at the half-filling and its quasielectron, quasihole, magnetoroton, and pair-breaking excitations are all identified. The quasielectron/quasihole excitations are described by a composite fermion model for Laughlin-correlated electron pairs. Comparison of energy spectra and wavefunction overlaps obtained for different pseudopotentials suggests that finite-size effects can be important in numerical diagonalization studies on a sphere.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 575-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pairing and Condensation of Laughlin Quasiparticles in Fractional Quantum Hall Systems
    Autorzy:
    Wójs, A.
    Yi, Kyung-Soo
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035751.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    From the analysis of their interaction pseudopotentials, it is argued that (at certain filling factors) Laughlin quasiparticles can form pairs. It is further proposed that such pairs could have Laughlin correlations with one another and form condensed states of a new type. The sequence of fractions corresponding to these states includes all new fractions observed recently in experiment (e.g.,ν=5/13, 3/8, or 4/11).
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 517-523
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jack Polynomials and Fractional Quantum Hall Effect at ν = 1/3
    Autorzy:
    Kuśmierz, B.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398638.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    71.10.Pm
    Opis:
    We investigate properties of strongly correlated, spinless electrons confined within given Landau level at filling factor ν = 1/3. Our analysis is based on the formalism of the Jack polynomials. Selected Jack polynomial wave functions are compared with ground states of the Coulomb interaction Hamiltonians, in different materials and the Landau levels, obtained by exact diagonalization. We show that certain Jack wave functions can be used as a description of fractional quantum Hall states.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 607-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pair-Distribution Functions of Laughlin Quasielectrons in Partially Filled Composite Fermion Levels
    Autorzy:
    Wodziński, D.
    Wójs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044550.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    Pair-distribution functions g(r) of the Laughlin quasielectrons are calculated in the fractional quantum Hall states at electron filling factorsν=4/11 and 3/8. They all have a shoulder at a medium range, supporting the idea of quasielectron cluster formation. The intra- and inter-cluster contributions to g(r) are identified. The average cluster sizes are estimated; pairs and triplets of quasielectrons are suggested atν=4/11 and 3/8, respectively.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 909-914
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractional Quantum Hall States with Non-Abelian Statistics
    Autorzy:
    Möller, G.
    Wójs, A.
    Cooper, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791297.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    71.10.Pm
    Opis:
    Using exact numerical diagonalization we have studied correlated many-electron ground states in a partially filled second Landau level. We consider filling fractions ν = 1/2 and 2/5, for which incompressible quantum liquids with non-Abelian anion statistics have been proposed. Our calculations include finite layer width, Landau level mixing and arbitrary deformation of the interaction pseudopotential. Computed energies, gaps, and correlation functions support the non-Abelian ground states at both ν = 1/2 ("Pfaffian") and ν = 2/5 ("parafermion" state).
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 847-848
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Transition in a Correlated Liquid οf Composite Fermions
    Autorzy:
    Wójs, A.
    Quinn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810412.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    We study spin polarization of the $ν_e$=4/11 fractional quantum Hall state corresponding to the ν=1/3 filling of the second composite fermion Landau level, and predict a spin phase transition in realistic systems.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 153-155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Phase Transition in a Correlated Composite Fermion Liquid
    Autorzy:
    Wójs, A.
    Simion, G.
    Wodziński, D.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047368.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    We study spin polarization of the ν$\text{}_{e}$=4/11 fractional quantum Hall state corresponding to the ν=1/3 filling of the second composite fermion Landau level, and predict a spin phase transition in realistic systems.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 153-156
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensation of Nonabelian Moore-Read Quasiholes in Correlated Composite Fermion Liquids
    Autorzy:
    Wodziński, D.
    Wójs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047043.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Pm
    73.43.-f
    Opis:
    Two- and three-body correlation functions (number of pairs or triplets vs. relative angular momentum) of electrons or Laughlin quasielectrons (i.e., composite fermions in their first excited Landau level) are studied numerically in several fractional quantum Hall liquids. It is shown directly that theν$\text{}_{e}$=4/11 liquid (corresponding to aν=1/3 filling of composite fermions in their first excited Landau level) is a paired state of quasielectrons, hence interpreted as a condensate of "second-generation" quasiholes of Moore-Readν=1/2 state of composite fermions.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 417-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Commutators of Jastrow Factors and Angular Momentum Operators
    Autorzy:
    Kuśmierz, B.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033882.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    71.10.Pm
    02.10.Ox
    Opis:
    We present detailed calculations of commutators of the Jastrow factor and certain differential operators useful in the fractional quantum Hall effect. In particular, we analyze action of the angular momentum operators projected from the Haldane sphere on an arbitrary composite fermions state. Examined L⁺ and L¯ momentum operators and following uniformity condition had proven to be useful in the search for candidates for quantum Hall ground states among many families of polynomials including the Jack polynomials.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 405-407
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ising Ferromagnetism of Composite Fermions
    Autorzy:
    Výborný, K.
    Čertík, O.
    Pfannkuche, D.
    Wodziński, D.
    Wójs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047042.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    71.10.Pm
    75.10.Jm
    Opis:
    The quantum Hall ferromagnets at the half-filling of a pair of degenerate electron or composite fermion Landau levels are studied by exact numerical diagonalization. The results obtained using open and closed geometries (rectangular - with periodic boundary conditions and spherical) are compared. The ferro- and paramagnetic ground states are identified in finite-size energy spectra, and the pair-correlation functions are used in search of the domain structure at half-polarization.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 409-415
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Hall State ν = 1/3 and Antilexicographic Order of Partitions
    Autorzy:
    Kuśmierz, B.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1185382.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    71.10.Pm
    02.10.Ox
    Opis:
    We focus on a certain aspect of trial wave function approach in the fractional quantum Hall effect. We analyze the role of partition orderings and discuss the possible numerical search for the partition determining the subspace of the Hilbert space containing a particular quantum Hall wave function. This research is inspired by analogical properties of certain polynomials which are the object of interest of the symmetric function theory, especially the Jack polynomials (related to the so-called "Jack states"). Presented method may be used in the search of candidate trial wave functions. We also justify (in certain cases) diagonalization of the Coulomb repulsion Hamiltonian restricted to certain subspaces. We focus on the states at filling factor ν=1/3 in the lowest and second Landau level.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1183-1186
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite Fermion Description of the Excitations of the Paired Pfaffian Fractional Quantum Hall State
    Autorzy:
    Wójs, A.
    Sreejith, G.
    Möller, G.
    Tőke, C.
    Jain, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492787.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.-f
    05.30.Pr
    71.10.Pm
    Opis:
    We review the recently developed bipartite composite fermion model for the excitations of the so-called Pfaffian state, a promising model for the fractional quantum Hall effect at the Landau level filling factor ν = 5/2. In particular, we demonstrate a necessary ingredient of the non-Abelian braid statistics, namely the degeneracy of spatially indistinguishable configurations of widely separated quasiparticles.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 830-838
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled Quantum Dots - Spatial Correlations between Interacting Carriers
    Autorzy:
    Szafran, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811910.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.43.-f
    71.10.Pm
    71.35.-y
    Opis:
    We review results of our modeling of excitons and excitonic trions confined in vertically stacked InGaAs/GaAs self-assembled quantum dots. Electrons and holes in double quantum dots are much more significantly correlated than in a single dot. For that reason our modeling was based on simple confinement potentials that allow for an exact diagonalization of the resulting two- and three-particle Hamiltonians with a precise account for the relative electron and hole localization along the stack. We studied the optical signatures of the coupling in context of the photoluminescence experiments performed in the external electric field. The calculations predicted prior to the experiment the mechanism of the exciton and negative trion dissociation by electron removal from the dot occupied by the hole. We discuss the competition between the tunnel and the electrostatic interdot couplings. Effects of the non-perfect alignment of the dots as well as stacks containing more than two dots are also discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1013-1039
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractional Quasiexcitons in Photoluminescence of Quantum Hall Liquids
    Autorzy:
    Wójs, A.
    Gładysiewicz, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044555.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    73.43.-f
    71.10.Pm
    Opis:
    Realistic calculations of photoluminescence spectra for a 20 nm quantum well at a filling factorν=1/3 are presented. The new states formed from charged excitons (trions) by correlation with the surrounding electrons are identified. These "quasiexcitons" differ from usual excitons and trions by having fractionally charged constituents. Their binding energies and emission intensities depend on the involved trion, leading to discontinuity in photoluminescence.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 923-928
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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