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Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides

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Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides. / Mostaani, Elaheh; Szyniszewski, Marcin; Price, Cameron et al.
In: Physical review B, Vol. 96, 075431, 22.08.2017.

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@article{cf35d6a5507a4b8594ed8d9dab426ee0,
title = "Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides",
abstract = "Excitonic effects play a particularly important role in the optoelectronic behavior of two dimensional semiconductors. To facilitate the interpretation of experimental photoabsorption andphotoluminescence spectra we provide (i) statistically exact diffusion quantum Monte Carlo bindingenergy data for a Mott-Wannier model of (donor/acceptor-bound) excitons, trions, and biexcitons in two-dimensional semiconductors in which charges interact via the Keldysh potential, (ii) contact pair-distribution functions to allow a perturbative description of contact interactions between charge carriers, and (iii) an analysis and classification of the different types of bright trion and biexciton that can be seen in single-layer molybdenum and tungsten dichalcogenides. We investigate the stability of biexcitons in which two charge carriers are indistinguishable, finding that they are only bound when the indistinguishable particles are several times heavier than the distinguishable ones. Donor/acceptor-bound biexcitons have similar binding energies to the experimentally measured biexciton binding energies. We predict the relative positions of all stable free and bound excitonic complexes of distinguishable charge carriers in the photoluminescence spectra of WSe2 and MoSe2.",
author = "Elaheh Mostaani and Marcin Szyniszewski and Cameron Price and R. Maezono and Hunt, {Ryan James} and Drummond, {Neil David} and Fal'ko, {Vladimir I.}",
year = "2017",
month = aug,
day = "22",
doi = "10.1103/PhysRevB.96.075431",
language = "English",
volume = "96",
journal = "Physical review B",
issn = "1098-0121",
publisher = "AMER PHYSICAL SOC",

}

RIS

TY - JOUR

T1 - Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides

AU - Mostaani, Elaheh

AU - Szyniszewski, Marcin

AU - Price, Cameron

AU - Maezono, R.

AU - Hunt, Ryan James

AU - Drummond, Neil David

AU - Fal'ko, Vladimir I.

PY - 2017/8/22

Y1 - 2017/8/22

N2 - Excitonic effects play a particularly important role in the optoelectronic behavior of two dimensional semiconductors. To facilitate the interpretation of experimental photoabsorption andphotoluminescence spectra we provide (i) statistically exact diffusion quantum Monte Carlo bindingenergy data for a Mott-Wannier model of (donor/acceptor-bound) excitons, trions, and biexcitons in two-dimensional semiconductors in which charges interact via the Keldysh potential, (ii) contact pair-distribution functions to allow a perturbative description of contact interactions between charge carriers, and (iii) an analysis and classification of the different types of bright trion and biexciton that can be seen in single-layer molybdenum and tungsten dichalcogenides. We investigate the stability of biexcitons in which two charge carriers are indistinguishable, finding that they are only bound when the indistinguishable particles are several times heavier than the distinguishable ones. Donor/acceptor-bound biexcitons have similar binding energies to the experimentally measured biexciton binding energies. We predict the relative positions of all stable free and bound excitonic complexes of distinguishable charge carriers in the photoluminescence spectra of WSe2 and MoSe2.

AB - Excitonic effects play a particularly important role in the optoelectronic behavior of two dimensional semiconductors. To facilitate the interpretation of experimental photoabsorption andphotoluminescence spectra we provide (i) statistically exact diffusion quantum Monte Carlo bindingenergy data for a Mott-Wannier model of (donor/acceptor-bound) excitons, trions, and biexcitons in two-dimensional semiconductors in which charges interact via the Keldysh potential, (ii) contact pair-distribution functions to allow a perturbative description of contact interactions between charge carriers, and (iii) an analysis and classification of the different types of bright trion and biexciton that can be seen in single-layer molybdenum and tungsten dichalcogenides. We investigate the stability of biexcitons in which two charge carriers are indistinguishable, finding that they are only bound when the indistinguishable particles are several times heavier than the distinguishable ones. Donor/acceptor-bound biexcitons have similar binding energies to the experimentally measured biexciton binding energies. We predict the relative positions of all stable free and bound excitonic complexes of distinguishable charge carriers in the photoluminescence spectra of WSe2 and MoSe2.

U2 - 10.1103/PhysRevB.96.075431

DO - 10.1103/PhysRevB.96.075431

M3 - Journal article

VL - 96

JO - Physical review B

JF - Physical review B

SN - 1098-0121

M1 - 075431

ER -