Atividade docente, aprender a ensinar no gênero aula

Muniz, Maria Ieda Almeida; Cunha, Daisy Moreira

doi:10.18316/recc.v22i2.3676

Cited by 1 publication

(1 citation statement)

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“…The optical properties of a crystalline system depend only on the Hamiltonian matrix and the Lax connection 35 . Since the Lax connection is null in the basis of our modelξ abk = 0, the velocity matrix elements are simply given by v (k) = −1 ∇ kH (k).…”

Section: Optical Propertiesmentioning

confidence: 99%

Effective model for the electronic and optical properties of stanene

Salazar

Muniz

Sipe

2017

Phys. Rev. Materials

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The existence of several 2D materials with heavy atoms has recently been demonstrated. The electronic and optical properties of these materials can be accurately computed with numerically intensive density functional theory methods. However, it is desirable to have simple effective models that can accurately describe these properties at low energies. Here we present an effective model for stanene that is reliable for electronic and optical properties for photon energies up to 1.1 eV. For this material, we find that a quadratic model with respect to the lattice momentum is the best suited for calculations based on the bandstructure, even with respect to band warping. We also find that splitting the two spin-ẑ subsectors is a good approximation, which indicates that the lattice buckling can be neglected in calculations based on the bandstructure. We illustrate the applicability of the model by computing the linear optical injection rates of carrier and spin densities in stanene. Our calculations indicate that an incident circularly polarized optical field only excites electrons with spin that matches its helicity.

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Section: Optical Propertiesmentioning

confidence: 99%