15,328 research outputs found
The edge engineering of topological Bi(111) bilayer
A topological insulator is a novel quantum state, characterized by
symmetry-protected non-trivial edge/surface states. Our first-principle
simulations show the significant effects of the chemical decoration on edge
states of topological Bi(111) bilayer nanoribbon, which remove the trivial edge
state and recover the Dirac linear dispersion of topological edge state. By
comparing the edge states with and without chemical decoration, the Bi(111)
bilayer nanoribbon offers a simple system for assessing conductance fluctuation
of edge states. The chemical decoration can also modify the penetration depth
and the spin texture of edge states. A low-energy effective model is proposed
to explain the distinctive spin texture of Bi(111) bilayer nanoribbon, which
breaks the spin-momentum orthogonality along the armchair edge.Comment: 5 pages, 5 figure
The linear and nonlinear Jaynes-Cummings model for the multiphoton transition
With the Jaynes-Cummings model, we have studied the atom and light field
quantum entanglement of multiphoton transition, and researched the effect of
initial state superposition coefficient , the transition photon number
, the quantum discord and the nonlinear coefficient on the
quantum entanglement degrees. We have given the quantum entanglement degrees
curves with time evolution, and obtained some results, which should have been
used in quantum computing and quantum information.Comment: arXiv admin note: text overlap with arXiv:1404.0821, arXiv:1205.0979
by other author
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