Browsing University of MissouriColumbia by Author "D'Agosta, Roberto"
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Electronic viscosity in a quantum well: A test for the localdensity approximation
D'Agosta, Roberto; Di Ventra, Massimiliano; Vignale, Giovanni, 1957 (American Physical Society, 200706)In the localdensity approximation (LDA) for electronic timedependent currentdensityfunctional theory, manybody effects are described in terms of the viscoelastic constants of the homogeneous threedimensional electron ... 
Non V representability of currents in timedependent manyparticle systems
D'Agosta, Roberto; Vignale, Giovanni, 1957 (American Physical Society, 200506)We argue that an arbitrarily chosen timedependent current density is generically nonVrepresentable in a manyparticle system; i.e., it cannot be obtained by applying only a timedependent scalar potential to the system. ... 
Relaxation in TimeDependent CurrentDensityFunctional Theory
D'Agosta, Roberto; Vignale, Giovanni, 1957 (American Physical Society, 200601)We apply the timedependent currentdensityfunctional theory to the study of the relaxation of a closed manyelectron system evolving from a nonequilibrium initial state. We show that the selfconsistent unitary time ... 
Temperature Dependence of the Tunneling Amplitude between Quantum Hall Edges
D'Agosta, Roberto; Vignale, Giovanni, 1957; Raimondi, Roberto (American Physical Society, 200503)Recent experiments have studied the tunneling current between the edges of a fractional quantum Hall liquid as a function of temperature and voltage. The results of the experiment are puzzling because at “high” temperature ... 
Transport properties of a twodimensional electron liquid at high magnetic fields
D'Agosta, Roberto; Raimondi, Roberto; Vignale, Giovanni, 1957 (American Physical Society, 200307)The chiral Luttinger liquid model for the edge dynamics of a twodimensional electron gas in a strong magnetic field is derived from coarsegraining and a lowest Landau level projection procedure at arbitrary filling factors ...