Browsing by Author "Moulopoulos, Konstantinos"
Now showing items 1-20 of 40
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Anomalous electronic conductance in quasicrystals
Roche, S.; Moulopoulos, Konstantinos (2000)Subtle quantum interference effects in one-dimensional quasicrystals are reported. Quite opposite to their metallic counterparts, quasiperiodic systems are shown to exhibit interesting variations of their conducting ...
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Article
Arbitrary mixture of two charged interacting particles in a magnetic Aharonov-Bohm ring: Persistent currents and Berry's phases
Kyriakou, Kyriaki; Moulopoulos, Konstantinos; Ghazaryan, A. V.; Djotyan, Anahit P. (2010)Aharonov-Bohm physics at the two-particle level is investigated for distinguishable interacting charged particles through the exact solution of a toy model with confined states. The effect of the inaccessible magnetic flux ...
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Article
Bound-state transition: An analytical model
Moulopoulos, Konstantinos (2000)By using an accurate dielectric function for a homogeneous paramagnetic electron liquid we attempt a simple analytical treatment of the bound-state (metal-insulator) transition in a system consisting of a single proton ...
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Chemical potentials in dense charged classical or quantal systems
Moulopoulos, Konstantinos; Ashcroft, N. W. (1991)We report a general method for evaluating the partial chemical potentials of a dense neutral multicomponent system of charged particles. The results of this analysis can be directly applied to the evaluation of chemical ...
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Competing broken-symmetry and rotationally symmetric spin-singlet states in a few-electron quantum dot in a magnetic field
Avetisyan, A.; Moulopoulos, Konstantinos; Djotyan, Anahit P. (2008)On the basis of developed variational many-body approach, within a second quantized formulation, the nature of the ground state of a few-electron system in a parabolic two-dimensional (2D) quantum dot (QD) is theoretically ...
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Article
Coulomb interactions and generalized pairing in condensed matter
Moulopoulos, Konstantinos; Ashcroft, N. W. (1999)Proceeding from a coherent-state functional-integral approach we give a first-principles theory of generalized pairing phases in a dense neutral system of electrons and protons. Apart from a standard stationary phase ...
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Conference Object
Coulomb repulsive correlation in A3B5 semiconductor quantum dots in the presence of a magnetic field
Avetisyan, A. A.; Djotyan, Anahit P.; Moulopoulos, Konstantinos (2006)The ground state total and correlation energies of a negative ion-electron and electron-electron systems in a parabolic QD with standard dispersion law are theoretically investigated in an external magnetic field by a ...
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Article
Coulomb repulsive correlation in systems with radial confinement: Quantum dots and the Overhauser model in an external magnetic field
Avetisyan, A. A.; Moulopoulos, Konstantinos; Djotyan, Anahit P. (2006)The ground-state correlation energy of an electron-negative ion system in a spherical quantum dot (QD) with parabolic confinement in an external homogeneous magnetic field is investigated. Both cases of finite and infinite ...
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Article
Curvature theorem for scattering states in charged systems
Moulopoulos, Konstantinos; Ashcroft, N. W. (1997)Under a (2,N-2) factorization assumption tor many-electron states, a curvature theorem is proposed that relates the zero-separation value and curvature of two-particle positional correlation functions in quantum many-body ...
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Article
Erratum: New low density phase of interacting electrons: The paired electron crystal (Physical Review Letters (1993) 70, 15, (2356))
Moulopoulos, Konstantinos; Ashcroft, N. W. (1993)
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Article
Erratum: Two interacting charged particles in an Aharonov-Bohm ring: Bound state transitions, symmetry breaking, persistent currents, and Berry's phase (Physical Review B - Condensed Matter and Materials Physics (2004) 70, (235327))
Moulopoulos, Konstantinos; Constantinou, Martha G. (2007)
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Article
Exciton in an Aharonov-Bohm ring: An exactly soluble interacting mesoscopic system
Moulopoulos, Konstantinos; Constantinou, Martha G. (2006)A Green's function procedure leads to an exact determination of the energy spectrum and the associated eigenstates of a system of two oppositely charged particles interacting through a contact potential and moving in a ...
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Exciton-donor complexes in semiconductor quantum dots in a magnetic field: Infinite and finite potential barriers
Avetisyan, A.; Djotyan, Anahit P.; Kazaryan, E.; Moulopoulos, Konstantinos (2008)The binding energy of the ground state of a charged exciton-donor complex in a spherical semiconductor quantum dot with infinite and finite potential barriers as well as the oscillator strength for the optical transition ...
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Conference Object
Few-electron systems in a quantum dot in a magnetic field: The Wigner molecule and paired electron phases
Avetisyan, A. A.; Moulopoulos, Konstantinos (2006)We have developed a variational many-body description for few-electron systems in a parabolic quantum dot in an external magnetic field. The ground state energy of the electronic system has been theoretically investigated ...
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Article
Few-electron systems in a quantum dot in a magnetic field: Wigner phase and broken-symmetry spin-singlet state
Avetisyan, A. A.; Moulopoulos, Konstantinos; Djotyan, Anahit P. (2008)The nature of the ground state of a few-electron system in a parabolic two-dimensional (2D) quantum dot (QD) is theoretically investigated on the basis of a variational many-body approach within a second quantized formulation. ...
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Article
The “Forgotten” Pseudomomenta and Gauge Changes in Generalized Landau Level Problems: Spatially Nonuniform Magnetic and Temporally Varying Electric Fields
Konstantinou, Georgios; Moulopoulos, Konstantinos (2017)By perceiving gauge invariance as an analytical tool in order to get insight into the states of the “generalized Landau problem” (a charged quantum particle moving inside a magnetic, and possibly electric field), and ...
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Article
Fracton superconductivity in quasicrystals - A theoretical possibility suggested by experiment
Moulopoulos, Konstantinos; Cyrot-Lackmann, F. (1999)Scattering of electrons due to fractons can result in a resistivity that decreases with temperature. Such a behavior also appears in real quasicrystalline materials. If this is then attributed to effective fracton scattering, ...
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Article
General theory of the metal-insulator transition
Moulopoulos, Konstantinos; Ashcroft, N. W. (1992)We present a general theory of the metal-insulator transition based on the formal introduction of an auxiliary irrotational gauge field and the subsequent behavior of the system in response to it. Correspondingly general ...
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Article
Generalized Coulomb pairing in the condensed state
Moulopoulos, Konstantinos; Ashcroft, N. W. (1991)Starting with a view of condensed matter as a neutral assembly of electrons and nuclei, with mutual Coulomb interactions, a coherent-state functional-integral approach gives a first-principles theory of pairing phases that ...
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Article
Generators of dynamical symmetries and the correct gauge transformation in the Landau level problem: Use of pseudomomentum and pseudo-angular momentum
Konstantinou, Georgios; Moulopoulos, Konstantinos (2016)Due to the importance of gauge symmetry in all fields of physics, and motivated by an article written almost three decades ago that warns against a naive handling of gauge transformations in the Landau level problem (a ...