Pressure induced optical absorption and refractive index changes of a shallow hydrogenic impurity in a quantum wire

Arunachalam, N.; Peter, A. John; Lee, Chang Woo

doi:10.1016/j.physe.2011.08.019

Cited by 26 publications

(5 citation statements)

References 25 publications

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“…The electron and hole wave functions penetrate into the barrier for narrow wells. These results are well known [31]. It is clear from the figure that the exciton binding energy depends on both well width and the potential barrier height.…”

Section: Resultssupporting

confidence: 79%

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Leonora¹,

Peter

2012

e-J. Surf. Sci. Nanotechnol.

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Temperature dependence of the exciton in a Cd1−x out Mnx out Te/Cd1−x in Mnx in Te/Cd1−x out Mnx out Te strained quantum well is investigated for various Mn content. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. Calculations are performed for various Mn ion content in a Cd1−xMnxTe material in which the strong built-in electric field due to piezoelectric polarizations are included. A theoretical study of diluted magnetic semiconductors treating local sp-d exchange interaction J between the itinerant carriers and the Mn electrons are treated within a realistic band structure. The temperature dependent optical absorption and the refractive index changes as a function of normalized photon energy with various Mn ion content are analyzed. Our results show that the occurred red shifts of the absorption resonant peak due to the effect of temperature give the information about the variation of two energy levels in the quantum well. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity, the temperature effect and the Mn content.

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Section: Resultssupporting

confidence: 79%

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Leonora¹,

Peter

2012

e-J. Surf. Sci. Nanotechnol.

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“…Meanwhile, the binding energy of the charged exciton is also insensitive to pressure. 51 Therefore, the evolution of the exciton and charged exciton emissions under pressure can reflect the variations of the interband transition. Thus the effect of the state population of the observed X − emission can be expressed as Eqn ( 2) and ( 3) are substituted in eqn ( 5), and then eqn ( 5) can be used to fit the pressure dependence of measured X − emission energy, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Pressure-induced K–Λ crossing in monolayer WSe₂

Dou

Ding

et al. 2016

Nanoscale

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The energy band structures and related room temperature exciton transitions of monolayer and bilayer tungsten diselenide (WSe2) are investigated using photoluminescence (PL) spectra under hydrostatic pressure up to 5.42 GPa. For monolayer WSe2, it is found that the conduction band Λ valley is 70 ± 30 meV higher than the K valley at zero pressure, and the K-Λ valley crossover happens at a pressure of approximately 2.25 GPa. The PL peak of exciton related to the direct K-K interband transition in monolayer and bilayer WSe2 shows a pressure-induced blue-shift at the rates of 31.5 ± 0.6 and 27 ± 1 meV GPa(-1), respectively. The indirect Λ-K interband transition for monolayer and bilayer WSe2 exhibits a distinctly different pressure response. The pressure coefficient is as small as -3 ± 6 meV GPa(-1) for monolayer, but a much larger value of -22 ± 1 meV GPa(-1) for bilayer WSe2, indicating that the interlayer coupling has a strong effect on the electronic states at the Λ valley.

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“…Over the years, the study of the electronic and optical properties of atomic, molecular or nanoscale systems, especially under the influence of external perturbations has become very relevant for the researchers. Effects of external environments such as a magnetic field [11][12][13][14][15][16][17][18][19][20][21][22], an electric field [23][24][25][26], both electric and magnetic fields [27,28] and hydrostatic pressure [29] on the electronic and optical properties of the nanostructure systems with impurities located on or out from the center constitute a subject of considerable interest of theoretical and experimental studies. Recently, many investigations both theoretical and experimental have been carried out on the energy levels and binding energies of hydrogenic impurities in the presence of a magnetic field using diverse calculation methods such as perturbation, variational and finite-difference methods [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

Aboulaï¹,

Melono²,

Doba³

et al. 2022

Phys. Scr.

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Non-relativistic energy levels, binding energies and oscillator strengths of CdSe⁄ZnT e core/shell spherical quantum dots with or without impurities submitted to an external magnetic ﬁeld have been investigated by using a B-spline based variational method, within the framework of the eﬀective mass approximation. In the case where the system contains hydrogenic impurity, the eﬀects of its oﬀ-center displacement combined to the height of the conﬁning potential have also been studied. The dielectric constant as well as the eﬀective mass are considered to be dependent on the radius. The modiﬁcations occurring due to the presence of the magnetic ﬁeld have been analyzed. We have found that the electronic and optical properties are strongly aﬀected by the magnetic ﬁeld strength, the spatial conﬁnement and the oﬀ-center displacement. The oscillator strengths and the binding energies increase with the magnetic ﬁeld, but its eﬀect on the binding energies (both ground and excited states) is dimmed by the reduction of the core-to-shell radii ratio and the increase of the oﬀ-center displacement to the vicinity of the shell. However, the oscillator strengths increase with the magnetic ﬁeld when the oﬀ-center displacement increases towards the shell.

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Pressure induced optical absorption and refractive index changes of a shallow hydrogenic impurity in a quantum wire

Cited by 26 publications

References 25 publications

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Pressure-induced K–Λ crossing in monolayer WSe₂

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

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Pressure induced optical absorption and refractive index changes of a shallow hydrogenic impurity in a quantum wire

Cited by 26 publications

References 25 publications

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Temperature Dependent Optical Properties in a Strained Diluted Magnetic Quantum Well

Pressure-induced K–Λ crossing in monolayer WSe2

Binding energies, oscillator strengths of core/shell spherical quantum dots with or without on- or off-center donor impurities under an external magnetic field

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Product

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Pressure-induced K–Λ crossing in monolayer WSe₂