Article
Spectroscopy
Yue Liu, Jiaxin Zou, Shurui Chen, Bo Zhong, Yingying Wang, Huatao Wang, Xiaoxiao Huang
Summary: Black phosphorus has important applications in various fields due to its anisotropy. Researchers used Raman spectroscopy to identify its crystal orientation, study its thermal properties, and investigate its surface enhancement effect as SERS substrates.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Nanoscience & Nanotechnology
Dongying Li, Yueyang Yu, Cun-Zheng Ning
Summary: This study successfully prepared high-quality stable few-layer black phosphorus samples through a specific strategy, leading to significant enhancements in photoluminescence and optical properties, which could potentially unlock new possibilities for photonics applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Seong-Yeon Lee, Ki-Ju Yee
Summary: The study investigates the anisotropic characteristics of black phosphorus crystal through the Raman tensor and birefringence, revealing the typical linear dichroism in the generation and detection of coherent phonons. The detection process is influenced by anisotropic multiple thin film interference, while A(g)(1) and A(g)(2) optical phonons decay into lower frequency acoustic phonons through a temperature-dependent anharmonic process.
Article
Nanoscience & Nanotechnology
Narayan Gaonkar, R. G. Vaidya
Summary: The investigation of lattice thermal conductivity in few-layer black phosphorus reveals an anisotropic thermal conductivity cross-over between zigzag and armchair directions at low temperatures. The study addresses the transition regimes of anisotropic-isotropic-low anisotropic thermal conductivity in black phosphorus and discusses the influence of phonon-boundary, phonon-phonon, and phonon-impurity scattering. The obtained phonon scattering coefficients are used to describe the thermal conductivity cross-over of zigzag and armchair black phosphorus, showing a good fit to experimental reports in a wide temperature range.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Leonard Schue, Felix A. Goudreault, Ariete Righi, Geovani C. Resende, Valerie Lefebvre, Emile Godbout, Monique Tie, Henrique B. Ribeiro, Tony F. Heinz, Marcos A. . Pimenta, Michel Cote, Sebastien Francoeur, Richard Martel
Summary: The optical response of black phosphorus (BP) was investigated, revealing a polarization-induced luminescence emission in the out-of-plane direction (b) and demonstrating the significant influence of anisotropy on the optical properties and carrier dynamics in BP.
Article
Multidisciplinary Sciences
Zhaojian Sun, Wujia Chen, Bowen Zhang, Lei Gao, Kezheng Tao, Qiang Li, Jia-Lin Sun, Qingfeng Yan
Summary: This study presents a bottom-up approach for the growth of fibrous red phosphorus (RP) flakes with (001)-preferred orientation via a chemical vapor transport method in the P/Sn/I-2 system. The authors investigate the optical anisotropy of the as-grown flakes and demonstrate their potential application as micro phase retarders in polarization conversion.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wanfu Shen, Zhaoyang Sun, Shuchun Huo, Chunguang Hu
Summary: The research reveals that the optical anisotropy of oxidized BP is less sensitive compared to its electrical conductivity, and the low coverage of the initial oxidized layer allows the optical properties to remain constant for days. As the oxidation layer grows and forms an effective layer, modulation of the total optical anisotropy through optical interference may result in increased or decreased optical anisotropy.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xuwei Cui, Wenlong Dong, Shizhe Feng, Guorui Wang, Congying Wang, Shijun Wang, Yekai Zhou, Xiaohui Qiu, Luqi Liu, Zhiping Xu, Zhong Zhang
Summary: Strain is an effective strategy to modulate the properties of 2D materials. Researchers have developed a novel rectangular-shaped bulge device to uniaxially stretch membranes and detect orientation-dependent properties of anisotropic 2D materials.
Article
Chemistry, Multidisciplinary
Shuai Zhang, Shufang Ma, Xiaodong Hao, Qingming Liu, Yanyan Hou, Qingbo Kong, Zhaoru Chen, Hanyu Ma, Ting Xi, Yang Xu, Ben Cao, Lin Shang, Bin Han, Bingshe Xu
Summary: High-purity BP crystals were successfully synthesized by the CVT method in an aRP, Sn, and I-2 system. The synthesis of BP involved a three-stage structural transformation of aRP-P-4-Hittorf's P (HP)-BP, with crystallization kinetics explaining the nucleation mechanism and competitive nucleation between HP and BP enabling the bottom-up preparation of BP nanobelts.
Article
Mechanics
Yiqing Zhang, Zhenbo Li, Feng Xu
Summary: This study investigates the dynamic behavior and thermoelastic damping of a circular single-layer black phosphorus-based (CSLBP-based) mass sensor. Molecular dynamic simulations and a circular orthotropic elastic plate model are used to analyze the natural frequency of CSLBP attached atomic mass. It is found that the natural frequency of the mass sensor is highly sensitive to the attachment mass, while the thermoelastic damping depends on the radius of the sensor, attachment mass, and environmental temperature. The circular orthotropic elastic plate model can effectively predict the dynamic behavior of the CSLBP-based mass sensor.
Article
Materials Science, Multidisciplinary
E. Carre, L. Sponza, A. Lusson, I Stenger, E. Gaufres, A. Loiseau, J. Barjon
Summary: This study investigates the infrared photoluminescence of black phosphorus single crystals at very low temperatures, identifying dominant excitonic transitions at 0.276 eV and a weaker one at 0.278 eV. The free-exciton binding energy is calculated to be 9.1 meV. Analysis shows that the PL intensity quenching of the 0.276 eV peak at high temperature is attributed to the localization of free excitons on a shallow impurity. Ultimately, the value of bulk black phosphorus bandgap is refined to 0.287 eV at 2 K.
Article
Polymer Science
Mihaela Baibarac, Teodora Burlanescu, Malvina Stroe, Ion Smaranda, Catalin Negrila
Summary: This work investigates the optical properties of black phosphorus (BP) sheets chemically/electrochemically functionalized with diphenyl amine (DPA) and its macromolecular compound poly(diphenylamine) (PDPA) in the absence/presence of phosphotungstic acid (PTA). The interaction of BP with PTA leads to the elimination of the PxOy layer on the BP surface. When BP chemically interacts with DPA, the resulting product is chemically functionalized BP sheets with an imino-phosphorane (IP) structure. Electrochemical oxidation of DPA-functionalized BP sheets with PTA increases the weight of P-N bonds, generating PDPA doped with PTA heteropolyanions. This process is confirmed by FTIR spectroscopy and Raman scattering. The study also reveals that BP acts as a PL quenching agent for DPA and PDPA, with a preferential orientation of PDPA doped with PTA on the surface of BP sheets.
Article
Physics, Applied
De-Kang Li, Su-Yun Wang, Xiao-Qing Yan, Bao-Wang Su, Zhen Hu, Zhi-Bo Liu, Jian-Guo Tian
Summary: Using a beam displacement amplification technique, we studied the Goos-Hanchen effect in mechanically exfoliated anisotropic 2D black phosphorus and rhenium disulfide. Anisotropic Goos-Hanchen shifts were observed along different crystal orientations of the two materials, with different characteristics of anisotropy. The Goos-Hanchen shift can be used to explore the anisotropy of the refractive index of a 2D material.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Qingyun Wan, Ke Xiao, Zongshang Li, Jihyuk Yang, Ji Tae Kim, Xiaodong Cui, Chi-Ming Che
Summary: Photonic circuit systems based on optical waveguiding heteroarchitectures have the potential to modulate optical signals at the micro- or nanoscale. By using organometallic complexes and supramolecular synthetic approaches, photonic circuit systems with tunable emission color and controllable sequences among different blocks can be prepared.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yue Zhou, Jiarong Chen, Lan Yue, Dasen Ren
Summary: High fluorescence intensity black phosphorus nanosheets are prepared using red phosphorus and ethylenediamine by a solvothermal method. The concentration of raw material to solvent ratio has an impact on the structure and optical properties of the prepared black phosphorus nanosheets. Monolayer structures with a transverse dimension of about 200 nm are obtained using the solvothermal method. The black phosphorus nanosheets exhibit superior luminescence performance with a room-temperature photoluminescence center at 470 nm when the preparation parameter is RP/EDA = 30 g L-1.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Physics, Applied
Wei Lu, Xiaoming Song, Jiwei Ling, Zipu Fan, Junchao Ma, Xiao Zhuo, Jing Liu, Xiaodong Hu, Faxian Xiu, Dong Sun
Summary: The study reveals that through the interaction of light with materials, the thermal-mechanical effect induced by light can be used to quantify the thermal and mechanical properties of elastic materials. This approach offers a novel avenue for characterizing the thermal and mechanical properties of materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Changhua Bao, Qian Li, Sheng Xu, Shaohua Zhou, Xiang-Yu Zeng, Haoyuan Zhong, Qixuan Gao, Laipeng Luo, Dong Sun, Tian-Long Xia, Shuyun Zhou
Summary: This study reveals the ultrafast dynamics of Dirac fermions in a 3D Dirac semimetal, showing their cooling mechanism and population inversion phenomenon. The linear dependence of relaxation rate on energy suggests cooling through intraband relaxation, and the observation of accumulated photoexcited carriers in the conduction band indicates population inversion with a relatively long lifetime compared to 2D graphene.
Article
Chemistry, Multidisciplinary
Jiawei Lai, Junchao Ma, Zipu Fan, Xiaoming Song, Peng Yu, Zheng Liu, Pei Zhang, Yi Shi, Jinluo Cheng, Dong Sun
Summary: This study presents a photodetector based on a type-II Weyl semimetal that can directly detect the orbital angular momentum (OAM) of light, extending the capability to the mid-infrared band. The design utilizes peculiar electrode geometries and the orbital photogalvanic effect (OPGE) to achieve the direct detection of OAM. The results show that the helical phase gradient of light can be distinguished by a current winding around the optical beam axis, enabling on-chip-integrated OAM detection in the mid-infrared region.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Wei Lu, Zipu Fan, Yunkun Yang, Junchao Ma, Jiawei Lai, Xiaoming Song, Xiao Zhuo, Zhaoran Xu, Jing Liu, Xiaodong Hu, Shuyun Zhou, Faxian Xiu, Jinluo Cheng, Dong Sun
Summary: This study reveals the transient photothermoelectric response of Dirac semimetallic Cd3As2, namely the photo-Seebeck effect and photo-Nernst effect, by studying the terahertz emission from the transient photocurrent induced by these effects. The response clearly indicates an order of magnitude enhancement on transient photothermoelectric current generation when a weak magnetic field is applied. These results highlight the enhancement of thermoelectric performance can be achieved in topological Dirac semimetals based on the Nernst effect.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Zhaohang Xue, Zipu Fan, Xin Liao, Yaolong Li, Yulu Qin, Guanyu Zhang, Xiaoming Song, Zhi-Min Liao, Dong Sun, Guowei Lu, Qihuang Gong
Summary: The artificial engineering of photoresponse is crucial for optoelectronic applications, and in this study, a metasurface on a semimetallic Cd3As2 nanoplate was designed and fabricated to improve its thermoelectric photoresponse. The metasurface enhanced light absorption and resulted in a temperature gradient, contributing to the thermoelectric photoresponse. The power-dependent and wavelength-dependent measurements confirmed the excellent photoresponse characteristics of the metasurface device, including a linearly dependent photoresponse and efficient separation of photoexcited carriers. The designed metasurface device also demonstrated an anisotropic polarization-dependent photoresponse. This study highlights the potential of metasurfaces in controlling the photoresponse of semimetallic materials.
Article
Multidisciplinary Sciences
Junchao Ma, Bin Cheng, Lin Li, Zipu Fan, Haimen Mu, Jiawei Lai, Xiaoming Song, Dehong Yang, Jinluo Cheng, Zhengfei Wang, Changgan Zeng, Dong Sun
Summary: The study reveals the band structures and semiconductor band gaps related to Weyl physics in tellurium, opening up new possibilities for exploring and utilizing chirality-related Weyl physics. Experimental results show that circular photogalvanic effect has opposite signs at different wavelengths, providing evidence of tellurium's Weyl-related optical response. These findings have important implications for the development of helicity-sensitive optoelectronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Long Zhang, Tian Liang, Yoshio Kaneko, Naoto Nagaosa, Yoshinori Tokura
Summary: The nonlinear Hall effect (NLHE) reflects the Berry-curvature-related properties in non-centrosymmetric but time-reversal-symmetric materials. A large NLHE is reported in a ferroelectric Weyl semimetal due to gigantic Berry curvature dipole density generated by tilted Weyl cones near the Fermi level. The present study establishes giant NLHE in a ferroelectric Weyl semimetal, showing potential for future applications such as current rectification.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Applied
Xin Liao, Chang Xu, Zi-Pu Fan, Ying-Ying Lan, Na Li, Chun-Guang Chu, An-Qi Wang, Dong Sun, Zhi-Min Liao
Summary: The combination of 2D Dirac semimetal graphene and 3D counterpart Cd3As2 in Dirac heterostructures can overcome the weak optical absorption in graphene-based devices and the dark current in pure Cd3As2 photodetectors, leading to high-performance photodetectors with broadband detection, high sensitivity, and rapid response.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Carmelita Roda, Alessio Di Giacomo, Lucia Camila Tasende Rodriguez, M. Chandra Sekhar, Jari Leemans, Zeger Hens, Pieter Geiregat, Iwan Moreels
Summary: We synthesized CdSe/CdS nanoplatelets with 3.5 monolayers, which exhibit saturated blue emission and high photoluminescence quantum efficiency (PL QE) up to 55%. Compared to core-only nanoplatelets, the PL intensity decays exponentially due to suppressed deep trapping and delayed emission. Both core-only and core/crown nanoplatelets show biexciton-mediated optical gain between 470 and 510 nm, with higher gain coefficients in crowned nanoplatelets. However, the gain lifetimes are limited to 40 ps due to residual ultrafast trapping and higher exciton densities at threshold. These findings provide guidelines for optimizing CdSe nanoplatelets for lighting and light-amplification applications.
Article
Optics
Yucai Lin, Shuxia Chen, Chang Xu, Zipu Fan, Tingting Zou, Dong Sun, Jianjun Yang
Summary: This study demonstrates a femtosecond laser treatment strategy that can enhance the quality of bismuth films by reducing surface roughness and eliminating grain boundaries. As a result, the photoresponsivity of the bismuth films increases approximately 2 times within an ultra-broad spectrum range from the visible to mid-infrared.
Editorial Material
Optics
Xiaomu Wang, Dong Sun
Summary: Weyl semimetals are emerging topological materials with intriguing physical properties, which may lead to novel photonic and optoelectronic applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Physics, Applied
Changhua Bao, Peizhe Tang, Dong Sun, Shuyun Zhou
Summary: The interaction between light and 2D and topological materials serves as a fascinating control knob for inducing emergent properties and achieving new functionalities in ultrafast timescales, from femtoseconds to picoseconds. Recent experimental progress on light-induced phenomena, such as Bloch-Floquet states and photo-induced phase transitions, has been discussed, with perspectives on the opportunities of proposed light-induced phenomena and open experimental challenges also provided.
NATURE REVIEWS PHYSICS
(2022)