191 research outputs found
Tunable electronic and magneto-optical properties of monolayer arsenene from GW approximation to large-scale tight-binding simulations
Monolayers of group VA elements have attracted great attention with the
rising of black phosphorus. Here, we derive a simple tight-binding model for
monolayer grey arsenic, referred as arsenene (ML-As), based on the
first-principles calculations within the partially self-consistent GW0
approach. The resulting band structure derived from the six p-like orbitals
coincides with the quasi-particle energy from GW0 calculations with a high
accuracy. In the presence of a perpendicular magnetic field, ML-As exhibits two
sets of Landau levels linear with respect to the magnetic field and level
index. Our numerical calculation of the optical conductivity reveals that the
obtained optical gap is very close to the GW0 value and can be effectively
tuned by external magnetic field. Thus, our proposed TB model can be used for
further large-scale simulations of the electronic, optical and transport
properties of ML-As
Reveal quantum correlation in complementary bases
An essential feature of genuine quantum correlation is the simultaneous
existence of correlation in complementary bases. We reveal this feature of
quantum correlation by defining measures based on invariance under a basis
change. For a bipartite quantum state, the classical correlation is the maximal
correlation present in a certain optimum basis, while the quantum correlation
is characterized as a series of residual correlations in the mutually unbiased
bases. Compared with other approaches to quantify quantum correlation, our
approach gives information-theoretical measures that directly reflect the
essential feature of quantum correlation.Comment: 7 pages, 4 figure
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