Multiphonon Process in Mn-Doped ZnO Nanowires

Lai, Jia‐Min; Farooq, Muhammad; Sun, Yujia; Tan, Ping‐Heng; Zhang, Jun

doi:10.1021/acs.nanolett.2c01428

Cited by 11 publications

(5 citation statements)

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“…Various techniques, such as photoluminescence (PL) spectroscopy, absorption spectroscopy, and reflection spectroscopy, offer avenues for investigating the intricate interplay between excitons and phonons. 2 − 7 In conventional transition metal dichalcogenides, such as 2D MoS 2 , the existence of exciton–phonon coupling has been experimentally demonstrated by resonant Raman scattering and has been theoretically verified. 8 , 9 CrSBr is an A-type antiferromagnetic (AFM) material consisting of van der Waals (vdW) ferromagnetic monolayers that are antiferromagnetically coupled along the stacking direction.…”

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confidence: 96%

“…Exciton–phonon coupling, the interaction between excitons and lattice vibrations (phonons), is pivotal in determining the optical and electronic properties of materials, providing valuable insights into light–matter interactions. Various techniques, such as photoluminescence (PL) spectroscopy, absorption spectroscopy, and reflection spectroscopy, offer avenues for investigating the intricate interplay between excitons and phonons. − In conventional transition metal dichalcogenides, such as 2D MoS 2 , the existence of exciton–phonon coupling has been experimentally demonstrated by resonant Raman scattering and has been theoretically verified. , CrSBr is an A-type antiferromagnetic (AFM) material consisting of van der Waals (vdW) ferromagnetic monolayers that are antiferromagnetically coupled along the stacking direction. , Unlike most magnetic materials, CrSBr is a direct band gap semiconductor, providing opportunities for exploring the interplay among magnetic, optical, and electrical properties. It possesses a sizable band gap of approximately 1.5 eV , and demonstrates good air stability. , Moreover, it exhibits a high transition temperature for antiferromagnetic coupling, reaching 132 K for bulk CrSBr. ,, These characteristics position CrSBr as a highly promising material for applications in optoelectronics, spintronics, and quantum technologies. − …”

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Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Lin,

Sun,

Dirnberger

et al. 2024

ACS Nano

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The layered, air-stable van der Waals antiferromagnetic compound CrSBr exhibits pronounced coupling among its optical, electronic, and magnetic properties. As an example, exciton dynamics can be significantly influenced by lattice vibrations through exciton−phonon coupling. Using lowtemperature photoluminescence spectroscopy, we demonstrate the effective coupling between excitons and phonons in nanometer-thick CrSBr. By careful analysis, we identify that the satellite peaks predominantly arise from the interaction between the exciton and an optical phonon with a frequency of 118 cm −1 (∼14.6 meV) due to the out-of-plane vibration of Br atoms. Power-dependent and temperature-dependent photoluminescence measurements support exciton−phonon coupling and indicate a coupling between magnetic and optical properties, suggesting the possibility of carrier localization in the material. The presence of strong coupling between the exciton and the lattice may have important implications for the design of light−matter interactions in magnetic semiconductors and provide insights into the exciton dynamics in CrSBr. This highlights the potential for exploiting exciton−phonon coupling to control the optical properties of layered antiferromagnetic materials.

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confidence: 96%

mentioning

confidence: 99%

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Lin,

Sun,

Dirnberger

et al. 2024

ACS Nano

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“…And the averaged coupling amplitude can be calculated. Considering the total EPC in tBLG, the Hamiltonian is written as [30] H…”

Section: Electron-phonon Interaction In Moiré Superlatticesmentioning

confidence: 99%

“…S is the unit area, is the Bloch vector, is the band index in the first moiré Brillouin zone, and are respectively creation and annihilation operators of an electron, and are respectively creation and annihilation operators of the phonon, and represents the EPC strength. The averaged coupling amplitude is given by [30] ḡ n ≡…”

Section: Electron-phonon Interaction In Moiré Superlatticesmentioning

confidence: 99%

Review of phonons in moiré superlattices

Li¹,

Lai²,

Zhang³

2023

J. Semicond.

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Moiré patterns in physics are interference fringes produced when a periodic template is stacked on another similar one with different displacement and twist angles. The phonon in two-dimensional (2D) material affected by moiré patterns in the lattice shows various novel physical phenomena, such as frequency shift, different linewidth, and mediation to the superconductivity. This review gives a brief overview of phonons in 2D moiré superlattice. First, we introduce the theory of the moiré phonon modes based on a continuum approach using the elastic theory and discuss the effect of the moiré pattern on phonons in 2D materials such as graphene and MoS2. Then, we discuss the electron–phonon coupling (EPC) modulated by moiré patterns, which can be detected by the spectroscopy methods. Furthermore, the phonon-mediated unconventional superconductivity in 2D moiré superlattice is introduced. The theory of phonon-mediated superconductivity in moiré superlattice sets up a general framework, which promises to predict the response of superconductivity to various perturbations, such as disorder, magnetic field, and electric displacement field.

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“…Cox and co-workers [40] carried out defect manipulation to control ZnO micro/nanowire metal contacts. Lai and co-workers [41] studied the multiphonon process in Mn-doped ZnO nanowires. Labégorre and co-workers [42] reported on phonon scattering and electron doping from 2D structural defects in In/ZnO.…”

Section: Introductionmentioning

confidence: 99%

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

Ma,

Zhang,

Gao

et al. 2023

Coatings

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The characteristics of the surface and interface of nanocomposites are important for exerting multi-functional properties and widening interdisciplinary applications. These properties are mainly depending on the electronic structures of materials. Some key factors, such as the surface, interface, grain boundaries, and defects take vital roles in the contribution of desired properties. Due to the excellent sensitivity of the QCM (quartz crystal microbalance) device, the surface and interface features of the nanocomposite were studied with the aid of the gas-response of the sensors (Sensor’s Gas-Sensitivity) in this work. To make full use of the visible light and part of NIR, a ZnO/MnSx nanocomposite was constructed using hydrothermal synthesis for narrowing the bandgap width of wide bandgap materials. The results indicated that the absorbance of the resulting nanocomposite was extended to part of the NIR range due to the introduction of impurity level or defect level, although ZnO and MnS belonged to wide bandgap semiconductor materials. To explore the physical mechanism of light activities, the photoconductive responses to weak visible light (650 nm, etc.) and NIR (near-infrared) (808 nm, 980 nm, and 1064 nm, etc.) were studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate with the casting method. The results showed that the on/off ratio of ZnO/MnSx nanocomposite to weak visible light and part of NIR light were changed by about one to five orders of magnitude, with changes varying with the amount of MnSx nanoparticle loading due to defect-assisted photoconductive behavior. It illustrated that the ZnO/MnSx nanocomposite easily produced photo-induced free charges, effectively avoiding the recombination of electrons/holes because of the formation of strong built-in electrical fields. To examine the surface and interface properties of nanocomposites, chemical prototype sensor arrays were constructed based on ZnO, ZnO/MnSx nanocomposite, and QCM arrays. The adsorption response behaviors of the sensor arrays to some typical volatile compounds were examined under a similar micro-environment. The results exhibited that in comparison to ZnO nanosheets, the ZnO nanosheets/MnSx nanocomposite increased adsorption properties to some typical organic volatile compounds significantly. It would have good potential applications in photo-catalysts, self-cleaning films, multi-functional coatings, and organic pollutants treatment (VOCs) of environmental fields for sustainable development. It provided some reference value to explore the physical mechanism of materials physics and photophysics for photo-active functional nanocomposites.

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Multiphonon Process in Mn-Doped ZnO Nanowires

Cited by 11 publications

References 50 publications

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Review of phonons in moiré superlattices

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

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