Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2

Sim, Sangwan; Lee, Doeon; Трифонов, А. В.; Kim, Tae‐Young; Cha, Soonyoung; Sung, Ji Ho; Cho, Sungjun; Shim, Wooyoung; Jo, Moon Ho; Choi, Hyunyong

doi:10.1038/s41467-017-02802-8

Cited by 60 publications

(55 citation statements)

References 55 publications

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“…Like many 2DLMs, ReS 2 has been shown to have anisotropic band structure resulting in two major excitons with unequal binding energy [85][86][87][88][89]. This allows control over polarized light absorption, and consecutively polarization sensitive PD.…”

Section: Photodetectorsmentioning

confidence: 99%

Optoelectronic and photonic devices based on transition metal dichalcogenides

Thakar

Lodha

2020

Mater. Res. Express

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Transition metal dichalcogenides (TMDCs) are a family of two-dimensional layered materials (2DLMs) with extraordinary optical properties. They present an attractive option for future multifunctional and high-performance optoelectronics. However, much remains to be done to realize a mature technology for commercial applications. In this review article, we describe the progress and scope of TMDC devices in optical and photonic applications. Various photoresponse mechanisms observed in such devices and a brief discussion on measurement and analysis methods are described. Three main types of optoelectronic devices, namely photodetectors, photovoltaics and lightemitting devices are discussed in detail with a focus on device architecture and operation. Examples showing experimental integration of 2DLM-based devices with silicon photonics are also discussed briefly. A wide range of data for key performance metrics is analysed with insights into future directions for device design, processing and characterization that can help overcome present gaps and challenges. While the field is still in its infancy and requires significant efforts toward standardizing various approaches towards a mature technology, it has already shown promising results in broader aspects of compatibility, integration and performance for future electronics. Sensors are increasingly becoming an integrated part of the global electronic eco-system with the rise of data-driven technologies. There is a growing need for networks of cost-effective, robust and reliable sensors and their integration with present technologies. Optoelectronic and photonic devices are of importance for both sensing as well as high-speed optical communication applications. 2DLMs demonstrate significant light-matter interaction that is tunable with external physical and electronic parameters such as pressure, strain, electric and magnetic field [1-6]. Moreover, 2DLMs show strong dependence of their band structure on thickness with a transition to direct bandgap in monolayers in most of the known 2DLMs [7][8][9]. Graphene has been the most studied material since its discovery in 2004 [10][11][12]. Apart from graphene, there are nearly 1500 possible 2DLMs with a wide range of material properties as predicted by first principle simulations [13]. Transition metal dichalcogenides (TMDCs) are a family of 2DLMs in the form of MX 2 compounds, where M is a transition metal (Mo, W, Re) and X is a chalcogen (S, Se, Te). TMDCs are promising for electronic applications due to their semiconducting behaviour as opposed to semi-metallic graphene, and better thermal stability than materials such as black phosphorus and silicene [14][15][16][17][18][19]. Optoelectronic devices based on TMDCsTMDCs have been the most studied 2DLMs, apart from graphene and black phosphorus, for electronic and optoelectronic device applications [20,21]. They have a sizeable bandgap in the visible and near infrared (NIR) range (∼1-2 eV) that is optimal for optoelectronic sensors and light-emitting sources for short-ran...

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Section: Photodetectorsmentioning

confidence: 99%

Optoelectronic and photonic devices based on transition metal dichalcogenides

Thakar

Lodha

2020

Mater. Res. Express

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“…Moreover, the emission of the negative trions X 1 − (1.56 eV) and X 2 − (1.62 eV) also exhibit a distinct polarization‐dependent characteristic (Figure 3c). [ 18 ] An interesting ultrafast exciton quantum beats was observed in the atomically thin ReS 2 , which can be further modulated by tuning the laser polarization. In this regard, the highly anisotropic excitons and trions in ReX 2 provide great feasibility for polarization‐sensitive applications, such as anisotropic ultrafast optics and optical logic circuits.…”

Section: Structure and Properties Of Rex2mentioning

confidence: 99%

“…[ 13–14 ] Unlike group‐VI TMDs that stabilized in highly symmetric 2H structure, ReX 2 crystallizing in the unique distorted 1T (1T′) structure with reduced in‐plane crystal symmetry, which endow them strong in‐plane anisotropic optical, electrical, and phonon properties. [ 15–18 ] These extraordinary features are especially attractive for constructing novel photonic, electronic, and optoelectronic devices beyond conventional isotropic 2D materials. [ 19–24 ] Moreover, the weak interlayer coupling feature enables bulk ReX 2 to behave as electronically and vibrationally decoupled monolayers, leading to an obvious layer‐independent character in various properties.…”

Section: Introductionmentioning

confidence: 99%

2D Re‐Based Transition Metal Chalcogenides: Progress, Challenges, and Opportunities

Chen

Yang

et al. 2020

Advanced Science

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The rise of 2D transition-metal dichalcogenides (TMDs) materials has enormous implications for the scientific community and beyond. Among TMDs, ReX 2 (X = S, Se) has attracted significant interest regarding its unusual 1T′ structure and extraordinary properties in various fields during the past 7 years. For instance, ReX 2 possesses large bandgaps (ReSe 2 : 1.3 eV, ReS 2 : 1.6 eV), distinctive interlayer decoupling, and strong anisotropic properties, which endow more degree of freedom for constructing novel optoelectronic, logic circuit, and sensor devices. Moreover, facile ion intercalation, abundant active sites, together with stable 1T′ structure enable them great perspective to fabricate high-performance catalysts and advanced energy storage devices. In this review, the structural features, fundamental physicochemical properties, as well as all existing applications of Re-based TMDs materials are comprehensively introduced. Especially, the emerging synthesis strategies are critically analyzed and pay particular attention is paid to its growth mechanism with probing the assembly process of domain architectures. Finally, current challenges and future opportunities regarding the controlled preparation methods, property, and application exploration of Re-based TMDs are discussed.

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“…Such structure distortion is directly related to the high anisotropy in the Raman response from in-plane lattice vibrations 14–19 . It also affects optical properties, e.g., anisotropic character in optical absorption or photoluminescence comes from that of excitons 20–24 . Electrical conductivity is also found to be much higher along the chain direction than the direction perpendicular to the chain 13,25,26 .…”

Section: Introductionmentioning

confidence: 99%

Strong One-Dimensional Characteristics of Hole-Carriers in ReS2 and ReSe2

Kim

Kyung

Denlinger

et al. 2019

Sci Rep

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Each plane of layered ReS 2 and ReSe 2 materials has 1D chain structure, from which intriguing properties such as 1D character of the exciton states and linearly polarized photoluminescence originate. However, systematic studies on the 1D character of charge carriers have not been done yet. Here, we report on systematic and comparative studies on the energy-momentum dispersion relationships of layered transition metal dichalcogenides ReS 2 and ReSe 2 by angle resolved photoemission. We found that the valence band maximum or the minimum energy for holes is located at the high symmetric Z-point for both materials. However, the out-of-plane ( ) dispersion for ReSe 2 (20 meV) is found to be much smaller than that of ReS 2 (150 meV). We observe that the effective mass of the hole carriers along the direction perpendicular to the chain is about 4 times larger than that along the chain direction for both ReS 2 and ReSe 2 . Remarkably, the experimentally measured hole effective mass is about twice heavier than that from first principles calculation for ReS 2 although the in-plane anisotropy values from the experiment and calculations are comparable. These observation indicate that bulk ReS 2 and ReSe 2 are unique semiconducting transition metal dichalcogenides having strong one-dimensional characters.

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Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2

Cited by 60 publications

References 55 publications

Optoelectronic and photonic devices based on transition metal dichalcogenides

Optoelectronic and photonic devices based on transition metal dichalcogenides

2D Re‐Based Transition Metal Chalcogenides: Progress, Challenges, and Opportunities

Strong One-Dimensional Characteristics of Hole-Carriers in ReS2 and ReSe2

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