Ameliorating Emotional Attention through Modulation of Neural Oscillations with Transcranial Alternating Current Stimulation

S, Liu; He, Yong; Guo, Dan; Liu, Xiaoyu; Xin, Hao; Hu, Ping; Ming, Dong

doi:10.1101/2021.03.08.434260

Cited by 1 publication

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References 62 publications

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“…O estudo do acoplamento de Rashba, bem como efeitos que possam ocorrer nesse cenário, tornou-se um grande desafio para uma implementação confiável deste dispositivo. O mais interessanteé que este dispostivo que apresentei foi recentemente montado com sucesso 43 e muitos outros grupos vêm desenvolvendo técnicas e aplicações para este dispositivo [44][45][46][47][48] . A discrepância de tempo entre a proposta deste dispositivo e sua realização experimental devese a diversos fatores: tempos de coerência de spin, qualidade das estruturas crescidas e das interfaces entre estas estruturas, mecanismos de spin-flip, detecção de portadores polarizados, etc.…”

Section: Acoplamento Spin-órbita E Poços Quânticosunclassified

Transições ópticas em heteroestruturas semicondutoras Zincblende com duas sub-bandas

Mosqueiro¹

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In this work, I present an alternative derivation of the conduction band effective hamiltonian for Zincblende semiconductor heterostructures. Starting from the 8 × 8 Kane model and envelope function approximation, this effective hamiltonian was obtained by means of a linearization in the eigenenergy-dependent denominators present the conduction band equation, under the hypothesis that the energy gap is bigger than any other energy difference in the system (true for mostly every Zincblende semiconductor -bulk or heterostructure). Based on a previous procedure 1,3 , I have developed a more general procedure that implements sistematicaly (i) this linearization and (ii) renormalizes the conduction band spinor using the valence bands, both (i) and (ii) up to second order in the inverse of the energy gap. This procedure is identical to the expansion in power series of the inverse of the light speed used to derive non-relativistic approximations of the Dirac equation. One advantage of this procedure is the generality of the potentials adopted in our derivation: the same results hold for quantum wells, wires and dots. I show the consequences of each term of this hamiltonian for the electron eigenstates in retangular wells, including novel spin-independent terms (Darwin and linear momentum-electric field couplings). These resulties agree with previous works 4 . In order to study conduction band optical transitions, I show that the minimal substitution can be performed directly in the Kane hamiltonian if the external fields vary slowly (at least, as slowly as the envelope functions). Repeating the linearization of the energy denominators, I derive a new effective hamiltonian, up to second order in the inverse of the energy gap, with electron-photons couplings. One of these couplings, induced exclusively by the valence bands, gives rise to optical transitions mediated by the electron spin. This "spin-assisted" coupling enable optically-induced spin flipps in conduction subband transitions, which can be useful in the construction of spintronic devices. Finaly, the spin-assisted transitions rates show saturation and lines of maxima and minima in the reciprocal lattice. I hope that these optical couplings can be of any help in the observation of interesting effects induced by the intra and intersubband spin-orbit coupling.

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Section: Acoplamento Spin-órbita E Poços Quânticosunclassified

Transições ópticas em heteroestruturas semicondutoras Zincblende com duas sub-bandas

Mosqueiro¹

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Ameliorating Emotional Attention through Modulation of Neural Oscillations with Transcranial Alternating Current Stimulation

Cited by 1 publication

References 62 publications

Transições ópticas em heteroestruturas semicondutoras Zincblende com duas sub-bandas

Transições ópticas em heteroestruturas semicondutoras Zincblende com duas sub-bandas

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