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  • 1
    Electronic Resource
    Electronic Resource
    Information theory approach to a new Thomas-Fermi scheme
    Amsterdam : Elsevier
    Physics Letters A 184 (1994), S. 385-389 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(94)90509-6
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of Bernstein modes in quantum dots (2002)
    Springer
    The European physical journal 28 (2002), S. 111-115 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic aaand nanoscale systems – 73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The dipole modes of non-parabolic quantum dots are studied by means of their current and density patterns as well as with their local absorption distribution. The anticrossing of the so-called Bernstein modes originates from the coupling with electron-hole excitations of the two Landau bands which are occupied at the corresponding magnetic fields. Non-quadratic terms in the potential cause an energy separation between bulk and edge current modes in the anticrossing region. On a local scale the fragmented peaks absorb energy in complementary spatial regions which evolve with the magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00206-x
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  • 3
    Electronic Resource
    Electronic Resource
    Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling (2003)
    Springer
    The European physical journal 34 (2003), S. 359-365 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The influence of the Rashba spin-orbit coupling on the electron spin dynamics is investigated for a ballistic semiconductor quantum wire with a finite width. We monitor the spin evolution using the time-dependent Schrödinger equation. The pure spin precession characteristic of the 1D limit is lost in a 2D wire with a finite lateral width. In general, the time evolution in the latter case is characterized by several frequencies and a nonrigid spin motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00232-2
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic dipole and electric quadrupole responses of elliptic quantum dots in magnetic fields (2002)
    Springer
    The European physical journal 27 (2002), S. 409-415 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures – 73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic dipole (M1) and electric quadupole (E2) responses of two-dimensional quantum dots with an elliptic shape are theoretically investigated as a function of the dot deformation and applied static magnetic field. Neglecting the electron-electron interaction we obtain analytical results which indicate the existence of four characteristic modes, with different B-dispersion of their energies and associated strengths. Interaction effects are numerically studied within the time-dependent local-spin-density and Hartree approximations, assessing the validity of the non-interacting picture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00172-3
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  • 5
    Electronic Resource
    Electronic Resource
    Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots (2004)
    Springer
    The European physical journal 39 (2004), S. 87-92 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The level splittings induced by a horizontal magnetic field in a parabolic two-dimensional quantum dot with spin-orbit interaction are obtained. Characteristic features induced by the spin-orbit coupling are the appearance of zero-field gaps as well as energy splittings that depend on the electronic state and the orientation of the magnetic field in the quantum-dot plane. It is suggested that these quantum-dot properties could be used to determine the Rashba and Dresselhaus spin-orbit intensities
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00174-1
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  • 6
    Electronic Resource
    Electronic Resource
    Quantum binding of the BCS interaction model (1995)
    Springer
    International journal of theoretical physics 34 (1995), S. 707-716 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Schrödinger (as opposed to the Cooper or BCS-gap) equation is solved without approximation in momentum space for the BCS interaction model to obtain the quantum bound-state spectrum of an isolated pair of fermions in one, two, and three dimensions. Regardless of dimensionality, there is never more than a single bound state (in analogy with the nucleon-nucleon interaction), but a threshold value of the potential strength is needed to support this state in any dimension. For very low densities one recovers previously known formulas for two and three dimensions which are consistent in this limit with the more familiar properties of quantum binding for simple, purely attractive wells. Results are illustrated for typical conventional, cuprate, and superconducting semiconductors having controversially low carrier densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671018
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic Thomas-Fermi-Weizsäcker model for quantum dots: A comparison with Kohn-Sham ground states (2001)
    Springer
    The European physical journal 14 (2001), S. 77-81 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 73.20.Dx Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) – 78.20.Bh Theory, models and numerical simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic extension of the Thomas-Fermi-Weizsäcker kinetic energy is used within density-functional-theory to numerically obtain the ground state densities and energies of two-dimensional quantum dots. The results are thoroughly compared with the microscopic Kohn-Sham ones in order to assess the validity of the semiclassical method. Circular as well as deformed systems are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170237
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  • 8
    Electronic Resource
    Electronic Resource
    A non local approach for the exchange energy. Selfconsistent implementation in metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 131-133 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 31.20.Sy ; 03.65.Sq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Starting from the Hartree-Fock exchange energy density of a spin saturated system and using the Density Matrix Expansion we have built a non local Energy Density Functional without problems of divergence in the large gradient limit. We have applied this functional to the study of ground state properties and the dipole excitation energies of some metallic clusters in the quantal and semiclassical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425641
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  • 9
    Electronic Resource
    Electronic Resource
    Collective oscillations in quantum rings: A broken symmetry case (2000)
    Springer
    The European physical journal 12 (2000), S. 493-498 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 73.20.Dx Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) - 78.20.Bh Theory, models and numerical simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present calculations within density functional theory of the ground state and collective electronic oscillations in small two-dimensional quantum rings. No spatial symmetries are imposed to the solutions and, as in a recent contribution, a transition to a broken symmetry solution in the intrinsic reference frame for an increasingly narrow ring is found. The oscillations are addressed by using real-time simulation. Conspicuous effects of the broken symmetry solution on the spectra are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530070010
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  • 10
    Electronic Resource
    Electronic Resource
    Dipole excitation of Na clusters with a non-local energy density functional (1994)
    Springer
    The European physical journal 31 (1994), S. 283-286 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 31.20 ; 71.45
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elementary dipole excitations of the ionized clusters Na 9 + , Na 21 + and Na 41 + are investigated by solving the equations of the Random-Phase Approximation. The ground and excited states are described using the jellium model for the ionic background and a non-local energy density functional for the valence electrons. Non-local effects are specifically analyzed. The excitation energies thus obtained approach better than those of the Local Density Approximation both the full Hartree-Fock and the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01445008
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