Article
Physics, Multidisciplinary
Lucinda Steinfeld, Jared H. Cole, Harini Hapuarachchi
Summary: The prospects of controlling the absorption of cost-effective plasmonic metal nanoparticles Cu and Al using quantum emitters (QEs) are demonstrated semi-analytically. Cu and Au based plasmonic nanoparticles exhibit largely similar exciton-plasmon Fano interaction signatures and similar spectral regions of operation. Cu based nanohybrids show a QE-enhanced maximum absorption that approaches the level of isolated Au MNPs, with decreasing QE-Cu separation, increasing QE dipole element magnitude, and increasing medium permittivity. This makes Cu based exciton-plasmon nanohybrids more economical alternatives for Au MNPs and Au-based nanohybrids in absorption-based applications.
ANNALEN DER PHYSIK
(2023)
Article
Chemistry, Multidisciplinary
Shasha Li, Ka Kit Chui, Fuhuan Shen, He Huang, Shizheng Wen, ChiYung Yam, Lei Shao, Jianbin Xu, Jianfang Wang
Summary: Excitons in a transition-metal dichalcogenide monolayer can be modulated through strain and controlled with spatial and spectral control. In this study, strain-localized excitons in a WS2 monolayer were generated and detected by covering the monolayer on individual Au nanodisks or nanorods. Enhanced emission from the strain-localized excitons was observed at room temperature, and the emission intensity and peak energy could be adjusted by the size of the nanodisks. Furthermore, the excitation and emission polarization of the strain-localized excitons could be modulated by anisotropic Au nanorods.
Article
Optics
Yuxiang Tang, Yanbin Zhang, Fan Cao, Yizhen Sui, Xiang'ai Cheng, Lei Shi, Tian Jiang
Summary: This study presents an in-depth investigation on the spontaneous emission properties of hybrid systems consisting of CsPbBr3 nanocrystals and silver nanostructures. The results show that when the energy of CsPbBr3 matches the oscillation frequency of Ag nanodisks, there is a significant increase in photoluminescence intensity and relaxation rate.
Article
Optics
Tianchen Zhao, Qiang Ma, Yajie Bian, Yuyi Zhang, Yiting Liu, Xiaolei Zhang, Botao Wu, E. Wu, Shitao Lou, Qingyuan Jin
Summary: In this study, we investigated the strong coupling of TDBC molecules near pure nano-triangular Ag prisms or Ag@Au hollow nanoshells. The Rabi splitting was observed when TDBC molecules were deposited on these substrates with plasmonic resonance peak matching closely with the absorption band of TDBC J-aggregates. The decrease in photoluminescence intensity with increasing temperature confirmed the decreasing plasmon-exciton coupling interaction.
CHINESE OPTICS LETTERS
(2021)
Article
Chemistry, Physical
Kseniia A. Sergeeva, Kezhou Fan, Aleksandr A. Sergeev, Sile Hu, Haochen Liu, Christopher C. Chan, Stephen V. Kershaw, Kam Sing Wong, Andrey L. Rogach
Summary: We investigated the charge carrier dynamics in HgTe quantum dots emitting in the second near-infrared window and found that the exchange of ligands significantly affects the Auger recombination rate and the performance of HgTe-based thin film photodetectors.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Larionette P. L. Mawlong, Kamal Kumar Paul, P. K. Giri
Summary: This study demonstrates a dramatic enhancement of photoluminescence emission from direct chemical vapor deposited monolayer MoS2 on a fluorine-doped TiO2/Au nanoparticle plasmonic substrate, attributing the enhancement to the formation of a TiO2/Au/1L-MoS2 ternary core-shell heterojunction. The enhanced absorption and improved light coupling were revealed through UV-vis absorption and Raman spectra. The observed giant PL enhancement is a result of heavy p-doping of the MoS2 lattice and exciton-plasmon coupling initiated by localized surface plasmons in Au nanoparticles underneath the MoS2 film at the interface.
Article
Optics
Jijuan Jiang, Jun Wang, Tong Wu, Yachen Gao
Summary: Experimental results reveal that silver nanoparticles exhibit saturated absorption and reverse saturated absorption, caused by ground state plasmon bleaching and two-photon absorption, respectively. The energy relaxation process of silver nanoparticles after laser excitation involves electron-phonon coupling and phonon-phonon coupling processes.
Article
Chemistry, Multidisciplinary
Antonio Carone, Pablo Mariani, Anthony Desert, Marco Romanelli, Jacopo Marcheselli, Marco Garavelli, Stefano Corni, Ivan Rivalta, Stephane Parola
Summary: Chiral plasmonic nanomaterials have promising applications. This study expands the range of available chiral plasmonic nanostructures and proposes the importance of the outer part of the nanoparticles shell on plasmonic circular dichroism.
Article
Chemistry, Physical
Oleg A. Yeshchenko, Pavlo S. Khort, Nataliya V. Kutsevol, Vadym M. Prokopets, Olga Kapush, Volodymyr Dzhagan
Summary: The study focused on temperature-driven plasmon-exciton coupling in a hybrid nanosystem. Significant peak splitting in the absorption spectrum indicated the formation of plexcitons, while plasmonic enhancement of CdTe QDs' photoluminescence was observed over time. The reversible alteration of QD photoluminescence during heating-cooling cycles was attributed to nonradiative resonance energy transfer.
Article
Multidisciplinary Sciences
Yongjun Lee, Johnathas D'arf Severo Forte, Andrey Chaves, Anshuman Kumar, Trang Thu Tran, Youngbum Kim, Shrawan Roy, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Joon I. Jang, Tony Low, Jeongyong Kim
Summary: The authors demonstrate that screening exciton-exciton interaction in monolayer WS2 using proximal metal plates can significantly enhance the quantum yield.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Seongkwang Bae, Sanghee Nah, Doeon Lee, Muhammad Sajjad, Nirpendra Singh, Ku Min Kang, Sanghoon Kim, Geun-Ju Kim, Jaekyun Kim, Hionsuck Baik, Kyusang Lee, Sangwan Sim
Summary: Strongly bound excitons, characteristic of 2D semiconductors, are observed and theoretically confirmed in mono-, bi-, and tri-layer platinum diselenide (PtSe2) single crystals. The excitons in PtSe2 dominate the transient broadband response, with a redshift in the transient spectrum as the band-gap redshifts the exciton resonance. This study provides novel insights into exciton photophysics in platinum dichalcogenides.
Article
Materials Science, Multidisciplinary
Aiqin Hu, Weidong Zhang, Wenjing Liu, Hong Jiang, Lulu Ye, Ying Gu, Zhaohang Xue, Hai Lin, Jinglin Tang, Qihuang Gong, Guowei Lu
Summary: This study reveals the significant influence of plasmonic phase delay on the asymmetrical spectrum line shape of a plasmon-exciton coupling system. The phase effect was demonstrated in a hybrid system consisting of monolayer WSe2 and a gold nanorod, and it was found that the phase delay can modulate the intensity of the coupling modes.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Yuxiang Tang, Yanbin Zhang, Qirui Liu, Ke Wei, Xiang'ai Cheng, Lei Shi, Tian Jiang
Summary: Searching for ideal materials with strong effective optical nonlinear responses is a long-term task in contemporary quantum and nonlinear optics. This study explores plasmon-exciton polaritons (plexcitons) in a hybrid system composed of silver nanodisk arrays and monolayer tungsten-disulfide, which exhibit giant room-temperature nonlinearity. These plexcitons can be utilized to manipulate the ultrafast nonlinear absorption properties of the solid-state system, opening up new avenues for practical applications such as energy-efficient ultrafast all-optical switching and information processing.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Physical
Lei Ye, Yanping Liu, Qiaohui Zhou, Weijian Tao, Yujie Li, Zukun Wang, Haiming Zhu
Summary: Hybrid heterostructures combining organic and 2D layered semiconductors show great potential for light harvesting and optoelectronic applications. Particularly, organic materials displaying singlet fission (SF) are appealing due to their ability to generate two triplet excitons from one singlet exciton. However, successful SF-enhanced devices require careful design to ensure efficient singlet exciton transfer and competition with direct energy/charge transfer.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Dezhi Zhu, Jianfeng Yan, Jiawang Xie, Guangzhi He
Summary: Metallic nanorods are important materials with tunable plasmon resonances, high photothermal conversion efficiency, and chemical stability. The shape and atomic structures of metallic nanorods are crucial for practical applications, and ultrafast laser excitation can be used for atomic-level ablation to enhance surface activity. Near-field effect plays a key role in this process, providing opportunities for tailoring metallic nanorods at the atomic level.
Article
Chemistry, Multidisciplinary
Alessandro R. Mazza, Jason Lapano, Harry M. Meyer, Christopher T. Nelson, Tyler Smith, Yun-Yi Pai, Kyle Noordhoek, Benjamin J. Lawrie, Timothy R. Charlton, Robert G. Moore, T. Zac Ward, Mao-Hua Du, Gyula Eres, Matthew Brahlek
Summary: This study reports a large electronic and magnetic response induced in MnBi2Te4 magnetic topological insulator thin films by controlling surface oxidation. The results reveal a delicate dependence of the overall magnetic and electronic response on the stoichiometry of the top layers, suggesting the potential for engineering novel topological and magnetic responses in this material.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Computer Science, Hardware & Architecture
Muneer Alshowkan, Philip G. Evans, Brian P. Williams, Nageswara S. Rao, Claire E. Marvinney, Yun-Yi Pai, Benjamin J. Lawrie, Nicholas A. Peters, Joseph M. Lukens
Summary: This study proposes a quantum local area network design that addresses current limitations in timing and security through the use of commercial off-the-shelf components. By employing White Rabbit switches for node synchronization and a parallel quantum key distribution channel, the fidelity of distributed entangled states is significantly increased while ensuring the security of classical communications.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Nanoscience & Nanotechnology
David Curie, Jaron T. Krogel, Lukas Cavar, Abhishek Solanki, Pramey Upadhyaya, Tongcang Li, Yun-Yi Pai, Michael Chilcote, Vasudevan Iyer, Alexander Puretzky, Ilia Ivanov, Mao-Hua Du, Fernando Reboredo, Benjamin Lawrie
Summary: This study reveals the effect of strain on the negatively charged boron vacancy color center (VB-) in hexagonal boron nitride (hBN) through correlative cathodoluminescence and photoluminescence microscopies. The results show that strong localized enhancement and redshifting of the VB- luminescence can be observed at creases, consistent with density functional theory calculations.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Jonghee Yang, Diana K. LaFollette, Benjamin J. Lawrie, Anton V. Ievlev, Yongtao Liu, Kyle P. Kelley, Sergei V. Kalinin, Juan-Pablo Correa-Baena, Mahshid Ahmadi
Summary: Mixed cesium- and formamidinium-based metal halide perovskites (MHPs) are promising photovoltaic materials, but high cesium ratios result in chemical complexities and local inhomogeneities, compromising the optoelectronic performance.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yongtao Liu, Jonghee Yang, Benjamin J. Lawrie, Kyle P. Kelley, Maxim Ziatdinov, Sergei V. Kalinin, Mahshid Ahmadi
Summary: The increasing photovoltaic efficiency and stability of metal halide perovskites (MHPs) are attributed to the improvement in understanding the microstructure of polycrystalline MHP thin films. A workflow combining conductive atomic force microscopy (AFM) measurement with a machine learning (ML) algorithm was designed to systematically investigate the grain boundaries in MHPs. This approach revealed that the properties of grain boundaries play critical roles in MHP stability.
Article
Chemistry, Multidisciplinary
Sang Yong Song, Chengyun Hua, Luke Bell, Wonhee Ko, Hans Fangohr, Jiaqiang Yan, Gabor B. Halasz, Eugene F. Dumitrescu, Benjamin J. Lawrie, Petro Maksymovych
Summary: New pathways are needed to control the morphology and dynamics of superconducting vortex lattices in order to transform them into a computing platform. It has been discovered that nematic twin boundaries can align superconducting vortices in adjacent terraces. Different structural phases of the vortex lattice can be assumed by varying the density and morphology of the twin boundaries. These findings have implications for the design and control of strain-based topological quantum computing architectures.
Article
Multidisciplinary Sciences
Taeyong Kim, Soyeon Park, Vasudevan Iyer, Basamat Shaheen, Usama Choudhry, Qi Jiang, Gage Eichman, Ryan Gnabasik, Kyle Kelley, Benjamin Lawrie, Kai Zhu, Bolin Liao
Summary: By using in situ laser illumination inside a scanning electron microscope, this study characterizes the photo-induced ion migration in perovskites. Long-range migration of halide ions both on the surface and inside the bulk, as well as the vertical migration of lead ions, were observed. These findings provide valuable insights for the design and processing of perovskite materials.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Bogdan Dryzhakov, Benjamin J. Lawrie, Jakob Zosa Celio, Miaosheng Wang, Michael Koehler, Bin Hu
Summary: This paper investigates the emission and absorption characteristics of PEA(2)PbI(4) with gap states introduced during single crystal growth. It uncovers the switching phenomenon from narrowband green to broadband red photoluminescence, confirming the formation of a heterostructured electronic framework in the crystal.
Article
Physics, Applied
Olha Popova, Steven J. Randolph, Sabine M. Neumayer, Liangbo Liang, Benjamin Lawrie, Olga S. Ovchinnikova, Robert J. Bondi, Matthew J. Marinella, Bobby G. Sumpter, Petro Maksymovych
Summary: This study investigates resistive switching phenomena using scanning microwave impedance microscopy and cathodoluminescence microscopy. The results show that even at the lowest doses, helium ions can modify the nature of bonds but the conductive properties of the films remain stable. Additionally, the study explores a method of electroforming with lower dissipated power and provides information on characteristic impurity levels through calculations.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Weijun Luo, Alexander Puretzky, Benjamin Lawrie, Qishuo Tan, Hongze Gao, Anna K. Swan, Liangbo Liang, Xi Ling
Summary: The effect of Coulomb interactions on the brightness, single photon purity, and operating temperatures of strain-localized GaSe single-photon emitters (SPEs) was investigated. Electrostatic doping was used to suppress nonradiative recombination, leading to improved emission intensity, single photon purity, and increased operating temperature.
Article
Nanoscience & Nanotechnology
Weijun Luo, Alexander A. A. Puretzky, Benjamin J. J. Lawrie, Qishuo Tan, Hongze Gao, Zhuofa Chen, Alexander V. V. Sergienko, Anna K. K. Swan, Liangbo Liang, Xi Ling
Summary: This study reports the deterministic spatial localization of strain-induced single-photon emitters (SPEs) in multilayer GaSe by nanopillar arrays. The strain-controlled quantum confinement effect introduces well-isolated sub-bandgap photoluminescence and suppresses the broad band edge photoluminescence. Clear photon-antibunching behavior is observed from the quantum dot-like GaSe sub-bandgap exciton emission at 3.5 K. The strain-dependent confinement potential and brightness are strongly correlated, suggesting a promising route for tuning and controlling SPEs. The comprehensive investigations of strain-engineered GaSe SPEs provide a solid foundation for the development of 2D devices for quantum photonic technologies.
Article
Quantum Science & Technology
Zachariah O. Martin, Alexander Senichev, Samuel Peana, Benjamin J. Lawrie, Alexei S. Lagutchev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: A robust process for fabricating intrinsic single-photon emitters in silicon nitride has been established, showing promise for quantum applications. The photophysical properties of these emitters are probed through measurements of optical transition wavelengths, linewidths, and photon antibunching as a function of temperature. Insight into the potential for lifetime-limited linewidths is provided through measurements of inhomogeneous and temperature-dependent broadening of the zero-phonon lines.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Quantum Science & Technology
Chengyun Hua, Claire E. Marvinney, Seongjin Hong, Matthew Feldman, Yun-Yi Pai, Michael Chilcote, Joshua Rabinowitz, Raphael C. Pooser, Alberto M. Marino, Benjamin J. Lawrie
Summary: In this study, a two-mode squeezed light source was used to improve the minimum detectable signal in magnetic circular dichroism measurements. Even in lossy samples, significant improvements were achieved. This approach provides a new quantum-enhanced probe for the magneto-optical properties of sensitive materials.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Ethan J. Taylor, Vasudevan Iyer, Bibek S. Dhami, Clay Klein, Benjamin J. Lawrie, Kannatassen Appavoo
Summary: Researchers used cathodoluminescence microscopy and unsupervised machine learning to study how nanoscale heterogeneity accumulates within the structure of hybrid perovskite under external stimuli. They found that there was no significant change in the performance of hybrid perovskite under high-energy electron beam excitation, which can be used to study its degradation process.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Vasudevan Iyer, Kevin Roccapriore, Jacob Ng, Bernadeta Srijanto, David Lingerfelt, Benjamin Lawrie
Summary: Impulsive excitation of excitons or color centers by high-energy electron beams results in photon bunching in cathodoluminescence microscopy, which can be used to study excited-state dynamics, excitation and emission efficiency of nanoscale materials, and interactions with nanophotonic cavities.
