Browsing by Author "Qian, Zhixin"
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Dynamical exchangecorrelation potentials for an electron liquid
Qian, Zhixin; Vignale, Giovanni, 1957 (American Physical Society, 200206)The imaginary parts of the exchangecorrelation kernels fxcL,T(ω) in the longitudinal and transverse currentcurrent response functions of a homogeneous electron liquid are calculated exactly at low frequency, to leading ... 
Dynamical exchangecorrelation potentials for the electron liquid in the spin channel
Qian, Zhixin; Vignale, Giovanni, 1957 (American Physical Society, 200311)The components of the exchangecorrelation kernel tensor of an isotropic electron liquid in the spin channel have the structure f xc,2 L,T (q,v) ! q!0 A(v)/q21BL,T(v), where L denotes the longitudinal component and T the ... 
Erratum: Dynamical exchangecorrelation potentials for an electron liquid [Phys. Rev. B 65, 235121 (2002)]
Qian, Zhixin; Vignale, Giovanni, 1957 (American Physical Society, 200504)Erratum concerning Dynamical exchangecorrelation potentials for an electron liquid [Phys. Rev. B 65, 235121 (2002)] 
Failure of the local density approximation in timedependent spin density functional theory
Qian, Zhixin; Constantinescu, Adi; Vignale, Giovanni, 1957 (arXiv, 200209)It has been known for some time that the exchangecorrelation potential in time dependent density functional theory is an intrinsically nonlocal functional of the density as soon as one goes beyond the adiabatic approximation. ... 
Lifetime of a quasiparticle in an electron liquid
Qian, Zhixin; Vignale, Giovanni, 1957 (American Physical Society, 200502)We calculate the inelastic lifetime of an electron quasiparticle due to Coulomb interactions in an electron liquid at low (or zero) temperature in two and three spatial dimensions. The contribution of “exchange” processes ... 
Solving the Ultranonlocality Problem in TimeDependent SpinDensityFunctional Theory
Qian, Zhixin; Constantinescu, Adi; Vignale, Giovanni, 1957 (American Physical Society, 200302)It has been known for some time that the exchangecorrelation potential in time dependent densityfunctional theory is an intrinsically nonlocal functional of the density as soon as one goes beyond the adiabatic approximation. ... 
Spin Dynamics from TimeDependent SpinDensityFunctional Theory
Qian, Zhixin; Vignale, Giovanni, 1957 (American Physical Society, 200201)We derive the spinwave dynamics of a magnetic material from the timedependent spindensityfunctional theory in the linear response regime. The equation of motion for the magnetization includes, besides the static spin ... 
Spin Mass of an Electron Liquid
Qian, Zhixin; Vignale, Giovanni, 1957; Marinescu, D. C. (American Physical Society, 200409)We show that in order to calculate correctly the spin current carried by a quasiparticle in an electron liquid one must use an effective “spin mass” ms that is larger than both the band mass mb, which determines the charge ...