Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Cabrera, G. G."'
The semi-infinite XY spin chain with an impurity at the boundary has been chosen as a prototype of interacting many-body systems to test for non-ergodic behavior. The model is exactly solvable in analytic way in the thermodynamic limit, where energy
Externí odkaz:
http://arxiv.org/abs/1803.03543
Autor:
Fernandes, I. L., Cabrera, G. G.
Based on Keldysh non-equilibrium Green function method, we have investigated spin current production in a hybrid T-shaped device, consisting of a central quantum dot connected to the leads and a side dot which only couples to the central dot. The top
Externí odkaz:
http://arxiv.org/abs/1802.03439
We test the time evolution of quite general initial states in a model that is exactly solvable, $i.e.$ a semi-infinite $XY$ spin chain with an impurity at the boundary. The dynamics is portrayed through the observation of the site magnetization along
Externí odkaz:
http://arxiv.org/abs/1703.03446
Autor:
Siqueira, E. C., Orellana, P. A., Seridonio, A. C., Cestari, R. C., Figueira, M. S., Cabrera, G. G.
In this work, it is considered a nanostructure composed by a quantum dot coupled to two ferromagnets and a superconductor. The transport properties of this system are studied within a generalized mean-field approximation taking into account proximity
Externí odkaz:
http://arxiv.org/abs/1409.5390
Autor:
Dartora, C. A., Cabrera, G. G.
The elastic properties of solids are described in close analogy with General Relativity, by locally gauging the translational group of space-time. Electron interactions with the crystal lattice are thus generated by enforcing full gauge invariance, w
Externí odkaz:
http://arxiv.org/abs/1307.3571
Publikováno v:
Journal of Applied Physics; 9/28/2022, Vol. 132 Issue 12, p1-9, 9p
Autor:
Dartora, C. A., Cabrera, G. G.
In recent experiments conducted by the OPERA collaboration, researchers claimed the observation of neutrinos propagating faster than the light speed in vacuum. If correct, their results raise several issues concerning the special theory of relativity
Externí odkaz:
http://arxiv.org/abs/1112.3050
Autor:
Garcia, F. A., Adriano, C., Cabrera, G. G., Holanda, L. M., Pagliuso, P. G., Avila, M. A., Oseroff, S. B., Rettori, C.
We report evidence for a close relation between the thermal activation of the rattling motion of the filler guest atoms, and inhomogeneous spin dynamics of the Eu2+ spins. The spin dynamics is probed directly by means of Eu2+ electron spin resonance
Externí odkaz:
http://arxiv.org/abs/1107.1165
Autor:
Siqueira, E. C., Cabrera, G. G.
Publikováno v:
J Appl Phys, v.111, 113905 (2012)
The electric current and the magnetoresistance effect are studied in a double quantum-dot system, where one of the dots QDa is coupled to two ferromagnetic electrodes (F1,F2), while the second QDb is connected to a superconductor S. For energy scales
Externí odkaz:
http://arxiv.org/abs/1003.3688
Autor:
Garcia, F. A., Cabrera, G. G.
We give an extensive treatment of the pairing symmetry in the ferromagnetic superconductor $UGe_{2}$. We show that one can draw important conclusions concerning the superconducting state, considering only the transformation properties of the pairing
Externí odkaz:
http://arxiv.org/abs/1001.3309