Zobrazeno 1 - 10
of 176
pro vyhledávání: '"Frésard, Raymond"'
Publikováno v:
Phys. Rev. B 110, 115143 (2024)
Elucidating the impact of strong electronic interactions on the collective excitations of metallic systems has been of longstanding interest, mainly due to the inadequacy of the random phase approximation (RPA) in the strongly correlated regime. Here
Externí odkaz:
http://arxiv.org/abs/2402.06541
Publikováno v:
Modern Physics Letters B Vol. 38, No. 21 (2024) 2342002
In this Letter we analyze the coexisting ordered phases that arise in the half-filled $\varepsilon$-t-U-V extended Hubbard Model on the square lattice when tackled within the Kotliar andRuckenstein slave boson representation in the thermodynamical li
Externí odkaz:
http://arxiv.org/abs/2311.03861
Publikováno v:
Phys. Rev. B 106, 235131 (2022)
We introduce and analyze an extended Hubbard model, in which intersite Coulomb interaction as well as a staggered local potential (SLP) are considered, on the square lattice at half band filling, in the thermodynamic limit. Using both Hartree-Fock ap
Externí odkaz:
http://arxiv.org/abs/2210.16108
Publikováno v:
Phys. Rev. B 105, 245118 (2022)
We analyze the paramagnetic state of a two-band Hubbard model with finite Hund's coupling close to integer filling at $n=2$ in two spacial dimensions. Previously, a Mott metal-insulator transition was established at $n=2$ with a coexistence region of
Externí odkaz:
http://arxiv.org/abs/2204.04081
Autor:
Barbier, Tristan, Srinivasan, Bhuvanesh, Berthebaud, David, Eyert, Volker, Frésard, Raymond, Macaigne, Rodolphe, Marinel, Sylvain, Lebedev, Oleg I., Guilmeau, Emmanuel, Maignan, Antoine
Publikováno v:
Sustain. Energy Fuels 5, 5804-5813 (2021)
The current state-of-the-art thermoelectric materials are generally composed of expensive, scarce, and toxic elements. In this respect, copper-based sulfide compounds have emerged as viable alternatives. Herein, we report for the first time the succe
Externí odkaz:
http://arxiv.org/abs/2202.09273
Autor:
Photopoulos, Raphaël, Frésard, Raymond
Publikováno v:
Annalen der Physik, Wiley, 2019, pp.1900177
Motivated by the recent experimental determination of the three-dimensional Fermi surface of overdoped La-based cuprate superconductors [Horio et al., Phys. Rev. Lett. 2018, 121, 077004], we revisit the tight-binding parameterization of their conduct
Externí odkaz:
http://arxiv.org/abs/1910.13193
Autor:
Dao, Vu Hung, Frésard, Raymond
Publikováno v:
Ann. Phys. (Berlin) 532, 1900491 (2020)
The gauge symmetry group of any slave boson representation allows to gauge away the phase of bosonic fields. One benefit of this radial field formulation is the elimination of spurious Bose condensations when saddle-point approximation is performed.
Externí odkaz:
http://arxiv.org/abs/1910.11787
Publikováno v:
Sci. Technol. Adv. Mater. 18, 919 (2017)
The electronic transport properties of the delafossite oxides ABO$_2$ are usually understood in terms of two well separated entities, namely, the triangular A$^+$ and (BO$_2$)$^-$ layers. Here we review several cases among this extensive family of ma
Externí odkaz:
http://arxiv.org/abs/1711.07202
Publikováno v:
Phys. Rev. B 96, 064431 (2017)
Motivated by the discovery of multiferroicity in the geometrically frustrated triangular antiferromagnet CuCrO$_2$ below its N\'eel temperature $T_N$, we investigate its magnetic and ferroelectric properties using ab initio calculations and Monte Car
Externí odkaz:
http://arxiv.org/abs/1710.07538
Autor:
Dao, Vu Hung, Frésard, Raymond
Publikováno v:
EPL 120, 17004 (2017)
The charge dynamical response function of the $t-t'-U$ Hubbard model is investigated on the square lattice in the thermodynamical limit. The correlation function is calculated from Gaussian fluctuations around the paramagnetic saddle-point within the
Externí odkaz:
http://arxiv.org/abs/1709.00949