2017
DOI: 10.1063/1.4984790
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Exciton center-of-mass localization and dielectric environment effect in monolayer WS2

Abstract: The ultrathin transition metal dichalcogenides (TMDs) have emerged as promising materials for various applications using two dimensional semiconductors. They have attracted increasing attention due to their unique optical properties originate from neutral and charged excitons. In this paper, we study the strong localization of exciton center-of-mass motion within random potential fluctuations caused by the monolayer defects. Here, we report negatively charged exciton formation in monolayer TMDs, notably tungst… Show more

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Cited by 25 publications
(34 citation statements)
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References 88 publications
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“…Assuming disorder centers far away from each other, R 0 only leads to a phase in the momentum space. The approximation of a Gaussian disorder potential is well established in theory [41][42][43] and moreover, experimentally measured potential traps reveal a Gaussian-like behavior [19,22]. Note that our theory is not limited to Gaussian potentials but could be extended to other potential forms, such as elliptical [44] or nanobubbles [45].…”
Section: Theoretical Approachmentioning
confidence: 66%
See 1 more Smart Citation
“…Assuming disorder centers far away from each other, R 0 only leads to a phase in the momentum space. The approximation of a Gaussian disorder potential is well established in theory [41][42][43] and moreover, experimentally measured potential traps reveal a Gaussian-like behavior [19,22]. Note that our theory is not limited to Gaussian potentials but could be extended to other potential forms, such as elliptical [44] or nanobubbles [45].…”
Section: Theoretical Approachmentioning
confidence: 66%
“…By transforming the disorder potential into momentum space we find that it leads to a quantization of the exciton center-of-mass momentum, i.e. excitons cannot move freely anymore [42]. Then, we project the phonon-assisted polarization into a localized excitonic basis with S µ…”
Section: Theoretical Approachmentioning
confidence: 99%
“…This assumption can be justified by using the Saha equation. In fact, with respect to the mechanism leading to equilibrium between free excitons n XB free electrons n e , and free holes n h we apply the equilibrium thermal analysis using a Saha equation nnormalennormalhnXB=gnormalegnormalegXBμ2π2eEnormalBknormalBT=KXBionKXBnormalF …”
Section: Dynamics Of Excitonic States In Transition Metals Dichalcogementioning
confidence: 99%
“…In this case, we can separate the exciton center of mass and relative motion . The Hamiltonian of relative motion is largely studied in previous work [59,67].…”
Section: Description Of the Hamiltonien Of The Localized Exciton Via mentioning
confidence: 99%
“…In the presence of random disorder potential , the momentum of the center-of-mass motion is no longer a good quantum number as was assumed in the previous model related to the free exciton [38,49,59].…”
Section: Description Of the Hamiltonien Of The Localized Exciton Via mentioning
confidence: 99%