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43 papers
Quasiparticle wavefunction and its equation of motion
F. Aryasetiawan, K. Karlsson
The quasiparticle wavefunction of a many-electron system is traditionally defined as the eigenfunction of the quasiparticle eigenvalue equation involving the self-energy. In this a…
Origin of multiple Lifshitz transitions in the Weyl semi-metal RhSi
Krishnendu Patra, Viktor Christiansson, Ferdi Aryasetiawan +1
It is known from density functional theory (DFT) calculations that RhSi has a multifold degenerate Dirac point at the Fermi energy, with the dominant states in the low-energy regio…
Dynamical exchange-correlation potential formalism for spin- Heisenberg and Hubbard chains: the antiferromagnetic/half-filled case
Zhen Zhao, Claudio Verdozzi, Ferdi Aryasetiawan
The exchange-correlation potential formalism previously introduced and applied to the one-dimensional Hubbard model has been extended to spin systems and applied to the case of the…
Continuity equation for the many-electron spectral function
F. Aryasetiawan
Starting from the recently proposed dynamical exchange-correlation field framework, the equation of motion of the diagonal part of the many-electron Green function is derived, from…
Time-dependent exchange-correlation hole and potential of the electron gas
K. Karlsson, F. Aryasetiawan
The exchange-correlation hole and potential of the homogeneous electron gas have been investigated within the random-phase approximation, employing the plasmon-pole approximation f…
A Green's function method for the two-dimensional frustrated spin-1/2 Heisenberg magnetic lattice
Zhen Zhao, Claudio Verdozzi, Ferdi Aryasetiawan
The magnon Hedin's equations are derived via the Schwinger functional derivative technique, and the resulting self-consistent Green's function method is used to calculate ground st…