Pressure dependent optical properties of quantum dot with spin orbit interaction and magnetic field

Antil, Sheetal; Kumar, Manoj; Lahon, Siddhartha; Maan, A. S.

doi:10.1016/j.ijleo.2018.09.010

Cited by 18 publications

(4 citation statements)

References 32 publications

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“…Las expresiones para las funciones Γ k (r, λ k ) se detallan en [13,14]. Los λ k son los parámetros variacionales que se obtienen minimizando el valor esperado del Hamiltoniano descrito en la ecuación (5), esta energía mínima corresponde a la energía de la impureza para cada estado k, E k imp ,…”

Section: Teoríaunclassified

“…Estas características aumentan la contribución de las partes no lineales en las constantes dieléctricas y en las propiedades ópticas [2]. Por lo anterior, en los últimos años ha aumentado el interés por investigar el efecto sobre las propiedades cuánticas de sistemas de baja dimensionalidad debido a la acción de agentes externos tales como la temperatura, la presión hidrostática, los campos eléctricos y los campos magnéticos, con el fin de desarrollar nuevas aplicaciones tecnológicas [3,4,5,6,7,8]. Esto ha permitido importantes avances teóricos y experimentales en la manipulación y optimización de la respuesta óptica en nano-estructuras.…”

Section: Introductionunclassified

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Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Portacio,

Rasero Causil,

Urango Baquero

2023

Cienc. En Desarro.

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Se estudia teóricamente los estados cuánticos de un punto cuántico cilíndrico, (CDQ) de GaAs/Ga0,6Al0,4As con una impureza hidrogenoide en su interior y bajo la acción de un campo magnético uniforme, aplicado en la dirección axial del cilindro. Usando el método variacional se encontraron las energías y las funciones de onda de los estados de impureza, 1s-like, 2p−-like y 2p+-like, cuando ella se mueve dentro del CQD. Se encontró que existe degeneramiento en la energía de la impureza para los estados 2p−-like y 2p+-like en ausencia de campo magnético. Este degeneramiento se rompe solo al aplicar un campo magnético, indicando un efecto Zeeman en el sistema, asì la variación de la intensidad del campo magnético permite sintonizar la condición resonancia de dos fotones.

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Section: Teoríaunclassified

Section: Introductionunclassified

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Portacio,

Rasero Causil,

Urango Baquero

2023

Cienc. En Desarro.

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“…The electronic transitions and the related optical absorption phenomena can be studied within the widely used density matrix formalism [45][46][47] suitable for semiconductor nanostructures. In this present work, we calculate the optical absorption coefficients of a single electron confined in a vertically stacked VGQW system when it is irradiated by a classical optical field E opt (t) of frequency ω and optical intensity I, propagating in the positive z-direction.…”

Section: Electronic Spectrum and Optical Absorptionmentioning

confidence: 99%

Spectral features and optical absorption of vertically stacked V-groove quantum wires

et al. 2022

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The spectral features and the linear, nonlinear, and total optical absorption coefficients of two realistic $$\mathrm {GaAs/Ga}_{1-x}{\mathrm{Al}}_x{\mathrm{As}}$$ GaAs / Ga 1 - x Al x As vertically stacked V-groove quantum wires confining electronic states were theoretically studied. The compact density matrix formalism and the finite element method were used as solution frameworks. The influence of the barrier width, inter-sidewall angle, the crescent thickness of the stack, and the influence of a static electric field on the energy spectrum and the optical coefficients is addressed. Increasing the crescent thickness (inter-sidewall angle) leads to a reduction (non-monotonous increase) of the energy values, while the presence of a static electric field leads to controllable stark-like patterns. In all cases, anti-crossing points are reported. By increasing the crescent thickness, inter-sidewall angle, or barrier width, a non-monotonous blue-/red-shift of the resonant peaks of the optical absorption is observed. In addition, the results in asymmetric/symmetric vertically coupled V-groove quantum wire systems suggest that the quantum tunneling phenomenon can be linked to the enhancement of the total optical absorption due to the possibility of the generation of dipole moments by higher electron mobility. Thus, optical fields oriented along the growth direction enhance the optical absorption. Furthermore, the absorption coefficient maximum is drastically modified by varying the inter-sidewall angle, and even the evolution tendency can be inverted due to the anti-crossing points in the energy spectra. Since the obtained resonant peaks are located below 20 meV in the spectra, the analyzed system could be interesting for exploring and designing new Terahertz devices.

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“…On the other hand, temperature and hydrostatic pressure affect the energy levels and consequently the optical properties of the QD systems. The temperature and the hydrostatic pressure effects were investigated extensively: hydrostatic pressure and temperature effects on the electronic energy levels of a spherical QD placed at the center of a nano-wire [11]; pressure-dependent photoluminescence of CdSe/ZnS QDs; critical point of different pressure regimes [12]; simultaneous effects of hydrostatic pressure, temperature and electric field on optical absorption in InAs/GaAs lens shape QD [13]; simultaneous influence of hydrostatic pressure and temperature on the binding energy of impurity-doped QDs in the presence of noise [14]; temperature and hydrostatic pressure effects on single dopant states in hollow cylindrical core-shell QD [15]; the effects of polaronic mass and conduction band non-parabolicity on a donor-binding energy under the simultaneous effect of pressure and temperature basing on the numerical FEM in a spherical QD [16]; combined influence of hydrostatic pressure and temperature on interband emission energy of impurity doped QDs in the presence of noise [17]; modulating optical rectification; second and third harmonic generation of doped QDs; interplay between hydrostatic pressure, temperature and noise [18]; the effects of temperature, hydrostatic pressure and size on optical gain for GaAs spherical QD laser with hydrogen impurity [19]; pressure dependent optical properties of QD with spin orbit interaction and magnetic field [20]. In this paper, we investigate the temperature and the hydrostatic pressure effects on electronic structure and optical properties of the SSQD/WL interacting with two laser fields.…”

Section: Introductionmentioning

confidence: 99%

Temperature and hydrostatic pressure effects on the electronic structure, optical properties of spherical segment quantum dot/wetting layer and group velocity of light

Jahromi¹,

Dezhkam²

2020

Laser Phys.

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To investigate hydrostatic pressure and temperature effects on electron energy levels of an InAs spherical segment quantum dot with wetting layer embedded in GaAs barrier, we use the finite element method to solve the Schrödinger equation in the effective mass approximation. Results show that the ground, the first and the second excited state energies decrease (increase) as the hydrostatic pressure (temperature) increases for the constant temperature (pressure). Moreover, given the optical properties of the system interacting with two laser fields, red (blue) shifts are observed in the linear and nonlinear absorptions and dispersions for the probe pulse as the hydrostatic pressure (temperature) increases. Furthermore, as the hydrostatic pressure increases, the maximum of the group velocity of light inside the slow light frequency range increases and the slow light frequency range shifts to the lower probe frequencies.

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Pressure dependent optical properties of quantum dot with spin orbit interaction and magnetic field

Cited by 18 publications

References 32 publications

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Estados 1s-like, 2p−-like y 2p+-like de una impureza hidrogenoide en un punto cuántico cilíndrico bajo la acción de un campo magnético aplicado

Spectral features and optical absorption of vertically stacked V-groove quantum wires

Temperature and hydrostatic pressure effects on the electronic structure, optical properties of spherical segment quantum dot/wetting layer and group velocity of light

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