Publisher’s Note: Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons [Phys. Rev. Lett. 
<b>118</b>
, 127402 (2017)]

Anankine, Romain; Beian, Mussie; Dang, Suzanne; Alloing, Mathieu; Cambril, E.; Merghem, K.; Carbonell, Carmen Gomez; Lemaı̂tre, A.; Dubin, Franc Ois

doi:10.1103/physrevlett.118.159901

Cited by 21 publications

(52 citation statements)

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“…Dark excitons have orders of magnitude longer recombination times than bright excitons, usually determined by a tiny but essential coupling to optically active states. These long lived excitons in semiconductor nano-structures are to a certain extend decoupled from their environment and have been successfully used to investigate Bose-Einstein condensation 18 , 19 and to implement quantum information protocols 20 , 21 , 22 . It is therefore crucial to understand how to optically initialize dark excitons, their energy fine structure and coupling to light.…”

Section: Introductionmentioning

confidence: 99%

Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers

Robert¹,

Amand²,

Cadiz³

et al. 2017

Phys. Rev. B

186

237

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The intricate interplay between optically dark and bright excitons governs the light-matter interaction in transition metal dichalcogenide monolayers. We have performed a detailed investigation of the "spin-forbidden" dark excitons in WSe2 monolayers by optical spectroscopy in an out-of-plane magnetic field Bz. In agreement with the theoretical predictions deduced from group theory analysis, magneto-photoluminescence experiments reveal a zero field splitting δ=0.6 ± 0.1 meV between two dark exciton states. The low energy state being strictly dipole forbidden (perfectly dark) at Bz=0 while the upper state is partially coupled to light with z polarization («grey» exciton). The first determination of the dark neutral exciton lifetime τ D in a transition metal dichalcogenide monolayer is obtained by time-resolved photoluminescence. We measure τ D~1 10 ± 10 ps for the grey exciton state, i.e. two orders of magnitude longer than the radiative lifetime of the bright neutral exciton at T=12 K.

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Section: Introductionmentioning

confidence: 99%

Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers

Robert¹,

Amand²,

Cadiz³

et al. 2017

Phys. Rev. B

186

237

View full text Add to dashboard Cite

show abstract

“…[28][29][30][31][32][33][34][35][36][37][38][41][42][43][44][45][46][47][48][49] At high carrier densities, strong charge screening greatly reduces the probability of the bound electron-hole state formation. 50,51 At intermediate career densities, the scattering of formed excitons by free carriers and lattice vibrations affects the collective properties of excitonic systems through their energy, momentum, phase, electrical and spin polarization relaxation, [28][29][30][31][52][53][54] resulting in the spectral broadening and temperature lineshape variations of the exciton resonances in the optical excitation spectra. [55][56][57][58][59] In the process of inelastic scattering, an exciton can capture an extra charge to form a charged bound three-particle complex -the trion.…”

Section: Introductionmentioning

confidence: 99%

Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures

Bondarev

Vladimirova

2018

Phys. Rev. B

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We discuss neutral and charged complexes (biexciton and trion) formed by indirect excitons in layered quasi-two-dimensional semiconductor heterostructures. Indirect excitons -long-lived neutral Coulomb-bound pairs of electrons and holes of different layers -have been known for semiconductor coupled quantum wells and are recently reported for van der Waals heterostructures such as bilayer graphene and transition metal dichalcogenides. Using the configuration space approach, we derive the analytical expressions for the trion and biexciton binding energies as functions of the interlayer distance. The method captures essential kinematics of complex formation to reveal significant binding energies, up to a few tens of meV for typical interlayer distances ∼ 3 − 5Å, with the trion binding energy always being greater than that of the biexciton. Our results can contribute to the understanding of more complex many-body phenomena such as exciton Bose-Einstein condensation and Wigner-like electron-hole crystallization in layered semiconductor heterostructures.I.

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“…The occurrence of dark excitons has already been under intense experimental investigation [28][29][30][31]. Such a dark exciton has a prolonged lifetime [32], and can be utilized to realize exciton condensation [33][34][35] and implement quantum information protocols [36,37]. This work is supported by the Department of Energy, Basic Energy Sciences, Grant No.…”

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confidence: 99%

Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems

Zhang

Shan

2018

Phys. Rev. Lett.

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We show that the exciton optical selection rule in gapped chiral fermion systems is governed by their winding number w, a topological quantity of the Bloch bands. Specifically, in a C_{N}-invariant chiral fermion system, the angular momentum of bright exciton states is given by w±1+nN with n being an integer. We demonstrate our theory by proposing two chiral fermion systems capable of hosting dark s-like excitons: gapped surface states of a topological crystalline insulator with C_{4} rotational symmetry and biased 3R-stacked MoS_{2} bilayers. In the latter case, we show that gating can be used to tune the s-like excitons from bright to dark by changing the winding number. Our theory thus provides a pathway to electrical control of optical transitions in two-dimensional material.

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Publisher’s Note: Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons [Phys. Rev. Lett. 118 , 127402 (2017)]

Abstract: This corrects the article DOI: 10.1103/PhysRevLett.118.127402.

Cited by 21 publications

References 0 publications

Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers

Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers

Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures

Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems

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