Additional excitonic features and momentum-dark states in 
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Dhara, Avijit; Chakrabarty, Devarshi; Das, Poulami; Pattanayak, Aswini K.; Paul, Sanjoy; Mukherjee, Smita; Dhara, Sajal

doi:10.1103/physrevb.102.161404

Cited by 21 publications

(20 citation statements)

References 36 publications

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“…It should be noted that our interpretation of excitonic resonances in ReS 2 is in stark contrast to the recent proposition, according to which the two linearly polarized excitons originate from two valleys: Z and K1, with both series accompanied by the dark counterparts [26]. If that was the case, it would not be possible to achieve the inplane-direction selective coupling of bright exciton from one valley with two dark excitons from two valleys.…”

Section: Discussioncontrasting

confidence: 89%

“…The optical response of Re-dichalcogenides is known to be governed by two distinct excitonic resonances, split in energy and linearly polarized along different in-plane directions [19][20][21][22][23][24][25][26]. The origin of this fundamental property of ReSe 2 and ReS 2 is, however, ambiguous.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of this fundamental property of ReSe 2 and ReS 2 is, however, ambiguous. The contradictory scenarios invoking the exchange mediated splitting (in ReSe 2 ) [27], the transitions at two different, Z and K1 points of the Brillouin zone [26] or involving different orbitals have been proposed [24]. Besides, no clear consensus has been reached concerning even such a basic property as the direct or indirect character of the fundamental bandgap in Re-dichalcogenides.…”

Section: Introductionmentioning

confidence: 99%

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Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Kapuściński¹,

Dzian²,

Slobodeniuk³

et al. 2022

2D Mater.

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We perform a polarization-resolved magnetoluminescence study of excitons in ReS2. We observe that two linearly polarized Rydberg series of excitons are accompanied by two other Rydberg series of dark excitons, brightened by an in-plane magnetic field. All series extrapolate to the same single-electron bandgap, indicating that the observed excitons originate either from the same valley or from two valleys related by the inversion symmetry, and are split by exchange interaction. To interpret our observations of the magnetic brightening, we have to assume the dominant spin-orbit coupling to be Ising-like, which hints at an approximate symmetry of the electronic states in ReS2 which is higher than the crystal symmetry C i.

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Section: Discussioncontrasting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Kapuściński¹,

Dzian²,

Slobodeniuk³

et al. 2022

2D Mater.

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“…Few-layered ReS 2 had shown a reasonable photo-response, stimulating a panoply of applications in photodetectors [2][3][4], phototransistors [5], logic circuits [6][7][8], photocatalysis [9,10], and so on. ReS 2 differs from the common TMDC systems by virtue of its strongly anisotropic polarization-dependent optical [11][12][13][14][15][16], excitonic [17][18][19][20], and thermal responses [2,[21][22][23], originating from its lower intra-plane symmetries in the distorted 1T structural format.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional ReS2 : Solution to the unresolved queries on its structure and inter-layer coupling leading to potential optical applications

Gadde

Karmakar

Maji

et al. 2021

Phys. Rev. Materials

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Over the last few years, ReS 2 has generated a myriad of unattended queries regarding its structure, the concomitant thickness-dependent electronic properties, and its apparently contrasting experimental optical response. In this paper, with elaborate first-principles investigations, using density functional theory (DFT) and time-dependent DFT, we identify the structure of ReS 2 , which is capable of reproducing and analyzing the layer-dependent optical response. The theoretical results are further validated by an in-depth structural, chemical, optical, and optoelectronic analysis of the large-area ReS 2 thin films, grown by the chemical vapor deposition (CVD) process. Micro-Raman, x-ray photoelectron spectroscopy, cross-sectional transmission electron microscopy, and energy-dispersive x-ray analysis have enabled the optimization of the uniform growth of the CVD films. The correlation between the optical and electronic properties was established by static photoluminescence and excited state transient absorption measurements. Sulfur vacancy-induced localized mid-gap states render a significantly long lifetime of the excitons in these films. The ionic gel top-gated photodetectors, fabricated from the as-prepared CVD films, exhibit a large photo-response of ∼5 A/W and a remarkable detectivity of ∼10 11 Jones. The outcome of this paper will be useful in promoting the application of vertically grown large-area films in the field of optics and opto-electronics.

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“…[5,18,19] iii) Evidence of the existence of dark excitons has been reported in the literature in few-layer ReS 2 . [13,17,20] Dark excitons are non-radiative excitons. In 2D materials, some dark excitons exist because of the parallel spins of electron-hole pairs, [21] the recombination of which requires flipping of spin directions.…”

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confidence: 99%

Wavelength and Stacking Order Dependent Exciton Dynamics in Bulk ReS₂

Zhou

Wang

2022

Advanced Optical Materials

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ReS 2 is flat and difficult to determine, which makes it possible that VBM and CBM (conduction band minimum) are at different k points and hence ReS 2 might be an indirect bandgap material. [12] However, the k-difference of VBM and CBM is so small that there is still a strong peak shown in photoluminescence (PL) spectra even in bulk ReS 2 at room temperature (around 1.4 eV), corresponding to the indirect band transition. [1] This is drastically different from other TMDs, for which the monolayer has a direct bandgap with a clearly defined and strong PL peak, while bulk has an indirect bandgap with PL peak diminished. That is why there was a debate about whether ReS 2 has a direct or indirect band gap in the earlier literature. [13][14][15][16] (ii) ReS 2 has multiple bright excitons located at different k points and polarized along different directions. [1] Urban et al. studied the low temperature (≈10K) PL and pointed out that the intensity of the Exc. II should vanish if the excitons are fully thermalized and follow the Boltzmann distribution since the energy difference between two excitons is much larger than k B T. [17]

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Additional excitonic features and momentum-dark states in ReS2

Cited by 21 publications

References 36 publications

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Two-dimensional ReS2 : Solution to the unresolved queries on its structure and inter-layer coupling leading to potential optical applications

Wavelength and Stacking Order Dependent Exciton Dynamics in Bulk ReS₂

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Additional excitonic features and momentum-dark states in ReS2

Cited by 21 publications

References 36 publications

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2

Two-dimensional ReS2 : Solution to the unresolved queries on its structure and inter-layer coupling leading to potential optical applications

Wavelength and Stacking Order Dependent Exciton Dynamics in Bulk ReS2

Contact Info

Product

Resources

About

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS₂

Wavelength and Stacking Order Dependent Exciton Dynamics in Bulk ReS₂