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Intersubband Antipolaritons in Quantum Cascade Laser Structures

100%
Pereira M.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 3
783-786
EN
This paper presents an application of a dielectric approach to the strong coupling between light and intersubband transitions in a quantum cascade laser structure. The multisubband transition possibility allows for an interesting scenario of coexisting absorption and gain branches in the antipolariton dispersions.
2
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A Coupled Spin-Electron Diamond Chain with Different Landé g-Factors of Localized Ising Spins and Mobile Electrons

51%
Torrico J., Pereira M., Strečka J., Lyra M.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 1
140-142
EN
A coupled spin-electron diamond chain with localized Ising spins placed on its nodal sites and mobile electrons delocalized over interstitial sites is explored in a magnetic field taking into account the difference between the Landé g-factors of the localized spins and mobile electrons. The ground-state phase diagram is constituted by two classical ferrimagnetic phases, the quantum unsaturated paramagnetic phase and the saturated paramagnetic phase. Both classical ferrimagnetic phases as well as the unsaturated paramagnetic phase are reflected in a low-temperature magnetization curve as intermediate magnetization plateaus. The unsaturated paramagnetic phase is quantum in its character as evidenced by the fermionic concurrence calculated for a pair of the mobile electrons hopping in between the interstitial sites. It is shown that the magnetic field can under certain conditions induce a quantum entanglement above the disentangled ground state.
3
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Kinetically-Driven Frustration in Hybrid Spin Ladders

45%
Carvalho R., Pereira M., Lyra M., Rojas O., Strecka J.
Acta Physica Polonica A
|
2014
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vol. 126
|
issue 1
12-13
EN
We introduce a spin ladder model incorporating localized and delocalized spins, which is exactly solvable using the decoration-iteration and transfer-matrix techniques. Quantum correlations between delocalized spins induce an antiferromagnetic coupling between the spin chains that competes with a direct ferromagnetic exchange coupling. A resulting kinetically-driven frustration is predominant in the regime of low temperatures and large hopping amplitudes. We provide the full ground-state phase diagram, as well as the frustration diagram on distinct coupling regimes.
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