Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Bejas, M."'
Autor:
Bejas, M., Zimmermann, V., Betto, D., Boyko, T. D., Green, R. J., Loew, T., Brookes, N. B., Cristiani, G., Logvenov, G., Minola, M., Keimer, B., Yamase, H., Greco, A., Hepting, M.
Publikováno v:
Phys. Rev. B 109, 144516 (2024)
The essential building blocks of cuprate superconductors are two-dimensional CuO$_2$ sheets interspersed with charge reservoir layers. In bilayer cuprates, two closely spaced CuO$_2$ sheets are separated by a larger distance from the subsequent pair
Externí odkaz:
http://arxiv.org/abs/2311.01413
Autor:
Hepting, M., Boyko, T. D., Zimmermann, V., Bejas, M., Suyolcu, Y. E., Puphal, P., Green, R. J., Zinni, L., Kim, J., Casa, D., Upton, M. H., Wong, D., Schulz, C., Bartkowiak, M., Habicht, K., Pomjakushina, E., Cristiani, G., Logvenov, G., Minola, M., Yamase, H., Greco, A., Keimer, B.
Publikováno v:
Phys. Rev. B 107, 214516 (2023)
We use resonant inelastic x-ray scattering (RIXS) at the O $K$- and Cu $K$-edges to investigate the doping- and temperature dependence of low-energy plasmon excitations in La$_{2-x}$Sr$_{x}$CuO$_4$. We observe a monotonic increase of the energy scale
Externí odkaz:
http://arxiv.org/abs/2306.15650
Autor:
Hepting, M., Bejas, M., Nag, A., Yamase, H., Coppola, N., Betto, D., Falter, C., Garcia-Fernandez, M., Agrestini, S., Zhou, K. -J., Minola, M., Sacco, C., Maritato, L., Orgiani, P., Wei, H. I., Shen, K. M., Schlom, D. G., Galdi, A., Greco, A., Keimer, B.
Publikováno v:
Phys. Rev. Lett. 129, 047001 (2022)
We use resonant inelastic x-ray scattering (RIXS) to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr$_{0.9}$La$_{0.1}$CuO$_2$ (SLCO). We detect a plasmon gap of $\sim$~120 meV at the two-dimensional Brillouin zone ce
Externí odkaz:
http://arxiv.org/abs/2206.14083
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One-electron self-energy in the $t$-$J$ model was computed using a recently developed large-$N$ method based on the path integral representation for Hubbard operators. One of the main features of the self-energy is its strong asymmetry with respect t
Externí odkaz:
http://arxiv.org/abs/0810.1410
We study the t-J-$V$ model beyond mean field level at finite doping on the triangular lattice. The Coulomb repulsion $V$ between nearest neighbors brings the system to a charge ordered state for $V$ larger than a critical value $V_c$. One-particle sp
Externí odkaz:
http://arxiv.org/abs/0802.0430
Several experimental and theoretical studies in cobaltates suggest the proximity of the system to charge ordering (CO). We show, qualitatively, in the frame of a $t-V$ model coupled to phonons that optical phonon modes at the $K$ and $M$ points of th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0612358
We consider possible routes to superconductivity in hydrated cobaltates Na_xCoO_2.yH_2O on the basis of the t-J-V model plus phonons on the triangular lattice. We studied the stability conditions for the homogeneous Fermi liquid (HFL) phase against d
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608428
Using a recently developed perturbative approach, which considers Hubbard operators as fundamental excitations, we have performed electronic self-energy and spectral function calculations for the $t-J$ model on the square lattice. We have found that
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604670
Publikováno v:
Phys.Rev.B72,020504(R)(2005)
We propose that unconventional superconductivity in hydrated sodium cobaltate $Na_xCoO_2$ results from an interplay of electronic correlations and electron-phonon interactions. On the basis of the $t-V$ model plus phonons we found evidences for a) un
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410290