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pro vyhledávání: '"Katsanos D"'
In two dimensions chaotic level-statistics is expected for massless Dirac fermions in the presence of disorder. For weakly disordered graphene flakes with zigzag edges the obtained level-spacing distribution in the Dirac region is neither chaotic (Wi
Externí odkaz:
http://arxiv.org/abs/1302.2470
Quantum walks are considered in a one-dimensional random medium characterized by static or dynamic disorder. Quantum interference for static disorder can lead to Anderson localization which completely hinders the quantum walk and it is contrasted wit
Externí odkaz:
http://arxiv.org/abs/0708.1137
Publikováno v:
In Atmospheric Research 1 August 2018 208:88-93
Autor:
Evangelou, S. N., Katsanos, D. E.
Quantum chaos is linked to Brownian diffusion of the underlying quantum energy level-spacing sequences. The level-spacings viewed as functions of their order execute random walks which imply uncorrelated random increments of the level-spacings while
Externí odkaz:
http://arxiv.org/abs/quant-ph/0403206
We demonstrate fractal noise in the quantum evolution of wave packets moving either ballistically or diffusively in periodic and quasiperiodic tight-binding lattices, respectively. For the ballistic case with various initial superpositions we obtain
Externí odkaz:
http://arxiv.org/abs/quant-ph/0310125
Autor:
Evangelou, S. N., Katsanos, D. E.
We describe the singularities in the averaged density of states and the corresponding statistics of the energy levels in two- (2D) and three-dimensional (3D) chiral symmetric and time-reversal invariant disordered systems, realized in bipartite latti
Externí odkaz:
http://arxiv.org/abs/cond-mat/0206089
Autor:
Katsanos, D. E., Evangelou, S. N.
We diagonalize numerically a Fibonacci matrix with fractal Hilbert space structure of dimension $d_{f}=1.8316...$ We show that the density of states is logarithmically normal while the corresponding level-statistics can be described as critical since
Externí odkaz:
http://arxiv.org/abs/cond-mat/0111080
The Anderson delocalization-localization transition is studied in multilayered systems with randomly placed interlayer bonds of density $p$ and strength $t$. In the absence of diagonal disorder (W=0), following an appropriate perturbation expansion,
Externí odkaz:
http://arxiv.org/abs/cond-mat/0005423
We have studied the effect of a random superconducting order parameter on the localization of quasi-particles, by numerical finite size scaling of the Bogoliubov-de Gennes tight-binding Hamiltonian. Anderson localization is obtained in d=2 and a mobi
Externí odkaz:
http://arxiv.org/abs/cond-mat/9707150
Autor:
Evangelou, S. N., Katsanos, D. E.
We study numerically the effect of on-site Hubbard interaction U between two electrons in the quasiperiodic Harper's equation. In the periodic chain limit by mapping the problem to that of one electron in two dimensions with a diagonal line of impuri
Externí odkaz:
http://arxiv.org/abs/cond-mat/9703112