Excitonic trion<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>X</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>in semiconductor quantum wells

Stébé, B.; Munschy, G.; Stauffer, Louise; Dujardin, F.; Murat, J.

doi:10.1103/physrevb.56.12454

Cited by 74 publications

(56 citation statements)

References 35 publications

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“…[16][17][18] It implicitly assumes that the trion can be treated as an isolated, three-body problem reached in the low doping limit 25 . This approximation precludes the observation of Fermi edge effects arising from the dynamical response of the electron gas, 15,26 an effect which has been observed in the absorption spectra of MoS 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The Hamiltonians are parametrized by ab initio calculations. Variational wavefunctions, inspired by previous treatments of excitons in semiconductor quantum wells, [16][17][18] are employed. By treating neutral and charged excitons on an equal footing, we achieve an internal consistency that yields accurate, nontrivial predictions for neutral excitons while also providing quantitative insight into the more complex trion species as well as trion binding energies that agree well with those inferred from experiment.…”

Section: Introductionmentioning

confidence: 99%

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Theory of neutral and charged excitons in monolayer transition metal dichalcogenides

2013

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We present a microscopic theory of neutral excitons and charged excitons (trions) in monolayers of transition metal dichalcogenides, including molybdenum disulfide. Our theory is based on an effective mass model of excitons and trions, parametrized by ab initio calculations and incorporating a proper treatment of screening in two dimensions. The calculated exciton binding energies are in good agreement with high-level many-body computations based on the Bethe-Salpeter equation. Furthermore, our calculations for the more complex trion species compare very favorably with recent experimental measurements, and provide atomistic insight into the microscopic features which determine the trion binding energy.2

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of neutral and charged excitons in monolayer transition metal dichalcogenides

2013

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“…Therefore, there is a stronger influence f the confinement imposed by the QW on the second electron. The only published, so far, theoretical calculation f the trion binding energy as a function f the well width is done by Stébe et al [38]. Although it originally concerned GaAs/GaAlAs, it can be easily rescaled to our situation.…”

Section: Quantum Well Structures With Spatial In-plan Profilingmentioning

confidence: 99%

“…The calculation of Ref. [38] was performed for Qv = 0.43 and σ = 0.196. Fortunately, the band offset in CdTe/MgTe system, as we determined from the studies f PQWs, is nearly the same.…”

Section: Quantum Well Structures With Spatial In-plan Profilingmentioning

confidence: 99%

Graded Quantum Well Structures Made of Diluted Magnetic Semiconductors

et al. 1998

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In this paper we review results of studies of two types of spatially graded quantum well structures containing various layers of diłuted magnetic semiconductors Cd1-x xMn xTe or Cd1-x-yMnxΜgyΤe. The design of the structures has been recently proposed by us and suitable samples have been grown by a modified molecular beam epitaxy method. In the structures of the first type a digital profiling of the composition of the constituent material in the growth direction aIlowed to produce quantum wells with a specifically required shape of the confining potential (including parabolic, half-parabolic, triangular, and trapezoidal). Such samples were used for (i) determination of the conduction and vałence band offsets in MnTe/CdTe and MgTe/CdTe systems, (ii) for the demonstration of an enhanced exciton binding in a parabolic confining potential as well as for (iii) demonstration of the possibility of "spin-splitting engineering" in diluted magnetic semiconductors quantum structures. In the second type of the structures, a precise in-plane profiling of either quantum well width or the barrier width or n-type doping intensity was realized. These structures were subsequently used for studies of the evolution of optical spectra with an increase in the concentration of confined two-dimensional gas of conduction electrons.

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“…3-5͒ and ZnSe-based 6 heterostructures. Numerous properties have been investigated, such as the binding energy of singlet and triplet trion states with [7][8][9][10][11][12][13] and without 14,15 a magnetic field, the optical spectrum of trions with varying excess carrier density, 16 combined exciton-electron cyclotron resonances, 17 trion localization, 18 -21 and trion dynamics on a picosecond time scale. 5,[22][23][24][25] Time-resolved experiments have shown that the characteristic times ͑formation times of trions, recombination times of excitons and trions, and spin-flip times͒ are of the same order of magnitude, irrespective of the material studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamical equilibrium between excitons and trions in CdTe quantum wells in high magnetic fields

et al. 2002

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The formation of two-dimensional negatively charged excitons ͑negative trions͒ out of excitons and free electrons is found to be determined by a dynamical equilibrium. This dynamical equilibrium consists of a chemical equilibrium, relating the trion, exciton, and electron populations, modified by finite formation and recombination times of ͑charged͒ excitons, as is evidenced by a magnetic-field-dependent photoluminescence ͑PL͒ and far-infrared study of doped CdTe/CdMgTe quantum wells. The data show that the trion formation is entirely driven by the occupation of the spin-split trion, exciton and electron levels. Incorporation of the proposed trion formation scheme into a rate equation model gives a proper description of the experimental data, leading to values of the formation, recombination, and spin-flip times of trions and excitons that are in good agreement with results of time-resolved experiments in the literature. The model elucidates the effect of the heavy-hole splitting on the polarization degree of the trion PL in a magnetic field and the influence of the dark excitons on the trion formation.

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Excitonic trionX−in semiconductor quantum wells

Cited by 74 publications

References 35 publications

Theory of neutral and charged excitons in monolayer transition metal dichalcogenides

Theory of neutral and charged excitons in monolayer transition metal dichalcogenides

Graded Quantum Well Structures Made of Diluted Magnetic Semiconductors

Dynamical equilibrium between excitons and trions in CdTe quantum wells in high magnetic fields

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