Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Aryasetiawan, Ferdi"'
A quantum description is given of nanoskyrmions in 2D textures with localised spins and itinerant electrons, isolated or coupled to leads, in or out of equilibrium. The spin-electron exchange is treated at the mean-field level, while Tensor Networks
Externí odkaz:
http://arxiv.org/abs/2405.20897
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 region displaying mostly Rh $d$ character. Using DFT+U, we calculate the ba
Externí odkaz:
http://arxiv.org/abs/2403.19370
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 one-dimensional antiferromagnetic spin$-\frac{1}{2}$ Heisenberg model
Externí odkaz:
http://arxiv.org/abs/2305.16879
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 state spin patterns and magnetic structure factors for 2-dimensional mag
Externí odkaz:
http://arxiv.org/abs/2208.08359
The self-screening error in the random-phase approximation (RPA) and the $GW$ approximation (GWA) is a well-known issue and has received attention in recent years with several methods for a correction being proposed. We here apply two of these, a sel
Externí odkaz:
http://arxiv.org/abs/2206.01169
Autor:
Aryasetiawan, Ferdi
It is shown that the equation of motion of the one-particle Green function of an interacting many-electron system is governed by a multiplicative time-dependent exchange-correlation potential, which is the Coulomb potential of a time-dependent exchan
Externí odkaz:
http://arxiv.org/abs/2201.02854
The magnon-phonon coupling has received growing attention in recent years due to its central role in spin caloritronics and the emerging field of acoustic spintronics. At resonance, this magnetoelastic interaction drives the formation of magnon polar
Externí odkaz:
http://arxiv.org/abs/2111.00908
Autor:
Nilsson, Fredrik, Aryasetiawan, Ferdi
Publikováno v:
Phys. Rev. Materials 5, 050801 (2021)
We derive a gap equation for bilayer excitonic systems based on density functional theory and benchmark our results against quantum Monte-Carlo simulations and recent experiments on double bilayer graphene. The gap equation has a mean-field form but
Externí odkaz:
http://arxiv.org/abs/2101.08055
Autor:
Petocchi, Francesco, Christiansson, Viktor, Nilsson, Fredrik, Aryasetiawan, Ferdi, Werner, Philipp
Publikováno v:
Phys. Rev. X 10, 041047 (2020)
The recent discovery of superconductivity in hole-doped NdNiO$_2$ thin films has captivated the condensed matter physics community. Such compounds with a formal Ni$^+$ valence have been theoretically proposed as possible analogues of the cuprates, an
Externí odkaz:
http://arxiv.org/abs/2006.00394
Publikováno v:
Phys. Rev. Research 2, 013191 (2020)
We perform a systematic {\it ab initio} study of the electronic structure of Sr(V,Mo,Mn)O$_3$ perovskites, using the parameter-free $GW$+EDMFT method. This approach self-consistently calculates effective interaction parameters, taking into account sc
Externí odkaz:
http://arxiv.org/abs/1911.09955