Laser cooling and trapping of polariton

Kenfack, S. C.; Ekengoue, Clautaire Mwebi; Fotué, A. J.; Fobasso, F.C.; Bawe, G.N.; Fai, Lukong Cornelius

doi:10.1016/j.cocom.2017.05.001

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…This result is not surprising since Fabosso et al [40] indicated that electromagnetic field is useful for the control of both single or coupled particles entities. Even Kenfack et al [41] in their research work based on laser cooling and trapping of polariton made the same observation. Furthermore, our numerical simulations (FIG.…”

Section: Numerical Results and Discussionmentioning

confidence: 70%

Influence of strong electric field on the properties in semiconductor quantum dot

NOUPEYI,

Nguepnang,

Ekengoue

et al. 2023

Preprint

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Polarons are quasiparticles that result from a strong coupling regime between electron or a hole and ions in nanomaterials. Polarons manifest themselves in many different ways under the influence of external electric and (or) magnetic fields. This paper investigates the influence of strong electric field on polaron properties in semiconductor quantum dot (SCQD). We used the modified Lee Low Pines Huybrecht method to derive fundamental and first state energy of polaron. The superposition of these two states energies which form a quantum bit considered as a two level system (TLS) allowed us to evaluate the probability density, capacitance and conductance of the polaron under the Drude model. Our results indicate that the electric field possesses pronounced effects on the properties of polaron in SCQD. Some of these effects include but are not limited to: (i) the variation of the probability density according to the x and y planar coordinates; (2i) the periodical modification of the probability density with electric field frequency and its dependence on longitudinal optical (LO) phonon-coupling strength constant; (3i) the observation of both positive and negative values of the energy of the system, indicating the formation of free and couple polaronic entities in the system. In particular, we found that the ground state energy of the polaron is predominant in Galium Arsenide (GaAs) SCQD. It comes that, the investigation of strong polaron-electric field (laser radiation) is quite indicated in the case of Galium Arsenide (GaAs).

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Section: Numerical Results and Discussionmentioning

confidence: 70%

Influence of strong electric field on the properties in semiconductor quantum dot

NOUPEYI,

Nguepnang,

Ekengoue

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Coherent properties of exciton-polaritons constitute the central interest of many research studies [1][2][3][4][5]. Throughout this paper, the term polaritons will be used, referring always to exciton-polaritons, as suggested by several authors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Polariton condensate and Landau-Zener-Stückelberg interferometry transition in multilayer transition metal dichalcogenides

Ekengoue¹,

Kenfack-Sadem²,

Danga³

et al. 2022

Phys. Scr.

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This paper gives a detailed description of a high-performance polariton condensate for a quantum mechanical two-level system (TLS). We propose a transition metal dichalcogenides (TMDs) setup and theoretically carry out the spectroscopy of these polariton condensates. Through theoretical and numerical analysis, we obtain many features in two dimensional (2D) multilayer TMDs. We compute the energy of the system and the Landau-Zener-Stückelberg (LZS) quantum tunneling probability under the effect of a sequence of laser light. At certain critical 2D TMDs parameters, the system exhibits a multi-crossing scenario in a privileged position of 2D multilayer TMDs. We predict the consecutive modulations and highlight the conservation of the LZS interference patterns mapped from the 2D TMDs system. At weak coupling regime, a successful conversion of interferometry signals is identified for some values of laser frequency. We explain such a result as a valley sensitive cavity rate model due to coherent exchange and incoherent scattering, meaning that polariton condensate is formed in the valley around the Brillouin zone. The latter is used quantitatively and qualitatively to achieve high-precision measurements beyond that of its elementary constituents. The obtained results confirm that MoSe2 has the highest sensitivity to radiation field as compared to other 2D multilayer TMDs materials. Therefore, MoSe2 stands as an appropriate candidate among other 2D TMDs to form polariton condensates.

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Effect of electron-longitudinal-optical phonon coupling on the thermodynamic properties of asymmetric semiconductor quantum wire under the influence of magnetic field

Nguepnang,

Donfack,

Ekengoue

et al. 2024

Indian J Phys

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Laser cooling and trapping of polariton

Cited by 6 publications

References 25 publications

Influence of strong electric field on the properties in semiconductor quantum dot

Influence of strong electric field on the properties in semiconductor quantum dot

Polariton condensate and Landau-Zener-Stückelberg interferometry transition in multilayer transition metal dichalcogenides

Effect of electron-longitudinal-optical phonon coupling on the thermodynamic properties of asymmetric semiconductor quantum wire under the influence of magnetic field

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