Interlayer Excitons in Transition‐Metal Dichalcogenide Heterobilayers

Nagler, Philipp; Mooshammer, Fabian; Kunstmann, Jens; Ballottin, Mariana V.; Mitioglu, Anatolie; Chernikov, Alexey; Chaves, Andrey; Stein, Frederick; Paradiso, Nicola; Meier, Sebastián; Plechinger, Gerd; Strunk, Christoph; Huber, Rupert; Seifert, Gotthard; Reichman, David R.; Christianen, Peter C. M.; Schüller, Christian; Korn, Tobias

doi:10.1002/pssb.201900308

Cited by 18 publications

(13 citation statements)

References 62 publications

(91 reference statements)

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“…1c, we extract a dipole value with a lower bound of about 0.3 e•nm. In terms of order of magnitude, the large extracted dipole moments are very similar to results on interlayer excitons in MoSe 2 /WSe 2 heterobilayers using photoluminescence [5][6][7]26]. For comparison with other homobilayer systems, interlayer excitons have very different characteristics depending on the TMD material [27,28].…”

supporting

confidence: 76%

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Giant Stark splitting of an exciton in bilayer MoS$_2$

Leisgang,

Shree,

Paradisanos

et al. 2020

Preprint

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supporting

confidence: 76%

“…Zeeman splitting of interlayer excitons.-Magneto-optics is a powerful tool for line identification and transition energy tuning [26]. The A-intralayer exciton, which exhibits a negligible Stark shift, shows a negative Zeeman splitting of about 2 meV at B z = +9 T, which changes sign as the magnetic field direction is reversed in Fig.…”

mentioning

confidence: 97%

Giant Stark splitting of an exciton in bilayer MoS$_2$

Leisgang,

Shree,

Paradisanos

et al. 2020

Preprint

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“…While the space indirect emission has been predicted 34,43,59 and experimentally measured to be at energies close to 1 eV, 33,34,64 the most common emission observed by µ-PL at energies between 1.55-1.6 eV was identified as a momentum-space indirect owing to the large lattice mismatch and the offset of energy levels. [26][27][28][29][30][31][32] This particular interlayer emission was demonstrated to possess a weak twist angle dependence and became undetectable when the temperature is decreased. 26 However, several factors made us consider a possible reassignment of the PL bands reported in this range.…”

Section: Discussionmentioning

confidence: 93%

“…26,[28][29][30] We note that we did not take into consideration the twisted angle since the emission at 1.6 eV was observed for all the angles studied in the previous works. 26,27 d-e) and (h-i), and 200 nm in (f) and (j). Pixel sizes: 100 nm in (e) and (i), 30 nm in (f), and 40 nm in (j).…”

Section: Resultsmentioning

confidence: 99%

Strong localization effects in the photoluminescence of transition metal dichalcogenide heterobilayers

Rodríguez¹,

Kalbáč²,

Frank³

2021

2D Mater.

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The emergence of various exciton-related effects in transition metal dichalcogenides (TMDC) and their heterostructures has inspired a significant number of studies and brought forth several possible applications. Often, standard photoluminescence (PL) with microscale lateral resolution is utilized to identify and characterize these excitonic phenomena, including interlayer excitons (IEXs). We studied the local PL signatures of van der Waals heterobilayers composed of exfoliated monolayers of the (Mo, W)(S, Se)2 TMDC family with high spatial resolution (down to 30 nm) using tip-enhanced photoluminescence (TEPL) with different orders (top/bottom) and on different substrates. We evidence that in MoS2–WSe2 heterobilayers, other PL signals may appear near the reported energy of the IEX transitions, possibly interfering in the interpretation of the results. The extra signals are only observed locally in small areas where the topography looks distorted. We assign those signals to the PL of the individual monolayers, in which the exciton energy is altered by the local strains caused by the formation of blisters and nanobubbles, and the PL is extremely enhanced due to the decoupling of the layers. We prove that even a single nanobubble as small as 60 nm—hence not optically visible—can induce such a suspicious PL feature in the micro-PL spectrum of an otherwise flat heterobilayer. In contrast, a PL peak, which could be assigned to the interlayer exciton in MoS2–WSe2, is observed at ≈1.0 eV.

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“…The truly two dimensional nature of these 2D materials enables large quantum efficiencies, offers a straight-foward integration into existing photonic chip technology and offers a rich playground, in which to manipulate their electronic properties. Strain [19][20][21] , defects 22 and patterned dielectrics 23 affect electronic and optical properties much more significantly than in bulk materials, while heterobilayers 24,25 , moiré physics 26,27 , proximity-induced effects 28 and Janus monolayers 29 offer promising possibilities to tailor device properties.…”

Section: Introductionmentioning

confidence: 99%

Criteria for deterministic single-photon emission in two-dimensional atomic crystals

Thompson,

Brem,

Fang

et al. 2020

Preprint

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The deterministic production of single-photons from two dimensional materials promises to usher in a new generation of photonic quantum devices. In this work, we outline criteria by which singlephoton emission can be realised in two dimensional materials: spatial isolation, spectral filtering and low excitation of quantum emitters. We explore how these criteria can be fulfilled in atomically thin transition metal dichalcogenides, where excitonic physics dictates the observed photoemission. In particular, we model the effect of defects and localised strain, in accordance with the most common experimental realisations, on the photon statistics of emitted light. Moreover, we demonstrate that an optical cavity has a negative impact on the photon statistics, suppressing the single-photon character of the emission by diminishing the effect of spectral filtering on the emitted light. Our work provides a theoretical framework revealing criteria necessary to facilitate single-photon emission in two-dimensional materials and thus can guide future experimental studies in this field.

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Interlayer Excitons in Transition‐Metal Dichalcogenide Heterobilayers

Cited by 18 publications

References 62 publications

Giant Stark splitting of an exciton in bilayer MoS$_2$

Giant Stark splitting of an exciton in bilayer MoS$_2$

Strong localization effects in the photoluminescence of transition metal dichalcogenide heterobilayers

Criteria for deterministic single-photon emission in two-dimensional atomic crystals

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