Article
Chemistry, Multidisciplinary
Yves Auad, Cyrille Hamon, Marcel Tence, Hugo Lourenco-Martins, Vahagn Mkhitaryan, Odile Stephan, F. Javier Garcia de Abajo, Luiz H. G. Tizei, Mathieu Kociak
Summary: Whispering-gallery mode resonators contain multiple trapped narrow-band circulating optical resonances, with potential applications in quantum electrodynamics, optomechanics, and sensing. Despite the challenges posed by the spherical symmetry and low field leakage of dielectric microspheres, the interaction between whispering-gallery modes and metallic nanoparticles can effectively excite high-quality cavity modes with the potential for optical sensing and light manipulation.
Article
Chemistry, Multidisciplinary
Eli Sutter, Peter Sutter
Summary: Research has successfully produced vdW nanowires of approximately 15 nm in diameter through VLS growth on Bi catalysts, maintaining long lengths and exhibiting non-equilibrium stacking that may lead to 1D ferroelectricity in the crystalline structure. These nanowires carry screw dislocations, remain chiral, and achieve very high twist rates.
Article
Multidisciplinary Sciences
Sandhya Susarla, Pablo Garcia-Fernandez, Colin Ophus, Sujit Das, Pablo Aguado-Puente, Margaret McCarter, Peter Ercius, Lane W. Martin, Ramamoorthy Ramesh, Javier Junquera
Summary: This research utilizes a combination of techniques to probe the electronic structure within polar vortices in oxide superlattices at the atomic scale, finding that the peaks in Ti L-edge spectra systematically shift depending on the position of the Ti4+ cations. First-principles computations and simulations derived from first principles show good agreement with experimental results.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Mirjana Dimitrievska, Fredrik S. Hage, Simon Escobar Steinvall, Alexander P. Litvinchuk, Elias Z. Stutz, Quentin M. Ramasse, Anna Fontcuberta Morral
Summary: This study successfully characterizes the band structure of new compounds using high resolution electron energy-loss spectroscopy on nanowires, which correlates well with first principles calculations. This opens the way for non-destructive characterization of new materials and strengthens the route to new materials discovery.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xuexi Yan, Qianqian Jin, Yixiao Jiang, Tingting Yao, Xinwei Wang, Xiang Li, Chunyang Gao, Chunlin Chen, Hengqiang Ye, Xiu-Liang Ma
Summary: This study demonstrates that unidirectional threading dislocation arrays in an AlN thin film can emit ultraviolet light with a wavelength of -317 nm. By studying the atomic and electronic structures and band gaps of the AlN threading dislocations, it is found that these dislocations are comprised of edge, screw, and mixed dislocations. The defect states caused by the dangling bonds of Al and N at the dislocation cores contribute to the smaller band gaps exhibited by the AlN dislocations.
Article
Chemistry, Multidisciplinary
Andrea Konecna, Jiahan Li, James H. Edgar, F. Javier Garcia de Abajo, Jordan A. Hachtel
Summary: Hyperbolic phonon polaritons in hexagonal boron nitride enable direct manipulation of mid-infrared light at nanometer scales, with high-resolution EELS facilitating measurements and nanoscale spatial resolution maintained. The electron beam serves as a precise source and probe of HPhPs, allowing observation of nanoscale confinement and extraction of hBN polariton dispersions. The research reveals important phenomena like localized polaritons induced by environmental heterogeneity and strong modifications of high-momenta excitations by nanoscale heterogeneity.
Article
Nanoscience & Nanotechnology
F. Javier Garcia de Abajo, Valerio Di Giulio
Summary: The combination of free electron beams and ultrafast optics enables high-precision investigation of photonic nanostructures, while also providing the ability to manipulate wave functions to study and control quantum excitations. Research shows that excitation probabilities of single electrons are independent of their wave functions, contrasting with those of multiple modulated electrons which depend on their spatial arrangement, reflecting the quantum nature of their interactions.
Article
Chemistry, Physical
Luping Tang, Yiwei Liu, Xiao Wang, Ranran Wang, Jing Sun, Longbing He, Kuibo Yin, Tao Xu, Litao Sun
Summary: Controlling the shape, morphology, and porosity of hollow nanostructures is crucial for adjusting the characteristics of tailor-made nanomaterials. The construction of hollow bimetal oxide heterostructures with controllable nanocavities and high crystallinity through the Kirkendall effect is still being explored.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Capucine Tong, Thomas Bidaud, Eero Koivusalo, Marcelo Rizzo Piton, Mircea Guina, Helder Vinicius Avanco Galeti, Yara Galvao Gobato, Andrea Cattoni, Teemu Hakkarainen, Stephane Collin
Summary: Cathodoluminescence mapping is utilized to investigate the electron concentration gradient of Te-doped GaAs nanowires, revealing distinct electron concentration levels and gradients in nanowires grown at different temperatures.
Article
Materials Science, Multidisciplinary
David Kordahl, Duncan T. L. Alexander, Christian Dwyer
Summary: The majority of works in nanomaterial analysis focus on collective or single-particle excitations described by the electrostatic approximation, neglecting retardation and magnetic field effects. However, in some cases, this approximation is fundamentally inadequate when beam energy exceeds certain threshold values and sample dimensions are comparable to the wavelength of light in the material. In these situations, spatial variations in low-loss spectral maps from guided light modes may be observed.
Article
Chemistry, Multidisciplinary
Amelia C. Y. Liu, Timothy J. Davis, Toon Coenen, Sangeetha Hari, Lenard M. Voortman, Zhou Xu, Gangcheng Yuan, Patrycja M. Ballard, Alison M. Funston, Joanne Etheridge
Summary: Waveguide modes in chemically-grown silver nanowires on silicon nitride substrates are observed using cathodoluminescence excited by high-energy electrons. The presence of a long-range, travelling surface plasmon mode modulates the coupling efficiency of incident electron energy into the nanowires, causing oscillations in the measured cathodoluminescence. The experimental data are modeled using the theory of surface plasmon polariton modes, allowing for extraction of complex mode wavenumbers and excitation strength of the long-range surface plasmon mode.
Article
Chemistry, Multidisciplinary
Hongbin Yang, Andrea Konecna, Xianghan Xu, Sang-Wook Cheong, Eric Garfunkel, F. Javier Garcia de Abajo, Philip E. Batson
Summary: This study demonstrates the existence of relatively long-lived plasmons supported by high-mobility charge carriers in La-doped BaSnO3. The properties of infrared localized surface plasmons in BLSO nanoparticles are systematically investigated using electron energy-loss spectroscopy. The results show that LSPs in BLSO exhibit a high degree of spatial confinement compared to noble metals, and have relatively low losses and high quality factors. Further analysis clarifies the relation between plasmon damping and carrier mobility in BLSO.
Article
Chemistry, Multidisciplinary
Xiaomin Zhao, Chenglin Du, Rong Leng, Li Li, Weiwei Luo, Wei Wu, Yinxiao Xiang, Mengxin Ren, Xinzheng Zhang, Wei Cai, Jingjun Xu
Summary: This study demonstrates a new type of plasmon resonance nanostructure, and analyzes its role in reducing bandwidth through experiments and simulations. The results provide important references for understanding the mechanism of narrowing linewidths of plasmon resonances.
NANOSCALE ADVANCES
(2021)
Review
Chemistry, Multidisciplinary
Kellie Jenkinson, Luis M. Liz-Marzan, Sara Bals
Summary: Electron tomography is an important technique for visualizing nanoparticle morphology. This article summarizes the experimental and computational development of various multimode tomography techniques and their role in overcoming materials science challenges. Current challenges and future directions of multimode tomography are also discussed.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Eli Sutter, Jacob S. French, Peter Sutter
Summary: The successful synthesis of orthorhombic GeSe2 nanoribbons was reported, with investigations revealing its characteristic Raman spectrum and wide bandgap properties. This discovery holds significant implications for applications in optoelectronics and energy conversion.
Article
Physics, Applied
Begona Abad, Kirstin Alberi, Katherine E. Ayers, Sushmee Badhulika, Chunmei Ban, Helene Bea, Fanny Beron, Julie Cairney, Jane P. Chang, Christine Charles, Mariadriana Creatore, Hui Dong, Jia Du, Renate Egan, Karin Everschor-Sitte, Cathy Foley, Anna Fontcuberta i Morral, Myung-Hwa Jung, Hyunjung Kim, Sarah Kurtz, Jieun Lee, Diana C. Leitao, Kristina Lemmer, Amy C. Marschilok, Bogdana Mitu, Bonna K. Newman, Roisin Owens, Anna-Maria Pappa, Youngah Park, Michelle Peckham, Liane M. Rossi, Sang-Hee Shim, Saima Afroz Siddiqui, Ji-Won Son, Sabina Spiga, Sedina Tsikata, Elisa Vianello, Karen Wilson, Hiromi Yuasa, Ilaria Zardo, Iryna Zenyuk, Yanfeng Zhang, Yudi Zhao
Summary: Women have made significant contributions to applied physics research and their involvement is crucial for ongoing progress. The Roadmap on Women in Applied Physics, written by female scientists and engineers, aims to celebrate their achievements, showcase established and early career researchers expanding boundaries in their fields, and increase visibility of women's impact on applied physics research. The topics covered include plasma materials processing and propulsion, super-resolution microscopy, bioelectronics, spintronics, superconducting quantum interference device technology, quantum materials, 2D materials, catalysis and surface science, fuel cells, batteries, photovoltaics, neuromorphic computing and devices, nanophotonics and nanophononics, and nanomagnetism. The intention is to inspire more women to enter these fields and foster inclusivity within the scientific community.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Kate Reidy, Paulina Ewa Majchrzak, Benedikt Haas, Joachim Dahl Thomsen, Andrea Konecna, Eugene Park, Julian Klein, Alfred J. H. Jones, Klara Volckaert, Deepnarayan Biswas, Matthew D. Watson, Cephise Cacho, Prineha Narang, Christoph T. Koch, Soren Ulstrup, Frances M. Ross, Juan Carlos Idrobo
Summary: The integration of metallic contacts with 2D semiconductors can significantly affect the local optoelectronic properties. In this study, we analyze the local excitonic changes in a 2D semiconductor MoS2 in contact with Au. Our findings suggest that the observed changes are due to the dielectric screening of the excitonic Coulomb interaction, and increasing the van der Waals distance can optimize excitonic spectra in mixed-dimensional interfaces.
Article
Chemistry, Multidisciplinary
Heera Menon, Hossein Jeddi, Nicholas Paul Morgan, Anna Fontcuberta i Morral, Hakan Pettersson, Mattias Borg
Summary: Monolithic integration of InSb on Si was achieved by fabricating InSb metal-semiconductor-metal photodetectors directly on Si using a rapid melt growth process. The photodetectors exhibited a spectrally resolved photocurrent peak from a single crystalline InSb nanostructure with dimensions of 500 nm x 1.1 μm x 120 nm. Optical characterization revealed stable photoresponse under 1550 nm illumination, with a responsivity of 0.50 A W-1 at 16 nW illumination and a millisecond time constant. Electron backscatter diffraction spectroscopy showed occasional twin defects and crystal lattice twist in the single crystalline InSb nanostructures, causing a low-energy tail in the detector response, extending the photosensitivity to 10 μm wavelengths (0.12 eV) at 77 K.
NANOSCALE ADVANCES
(2023)
Article
Energy & Fuels
Santhanu Panikar Ramanandan, Andrea Giunto, Elias Z. Stutz, Benoit Reynier, Ileane Tiphaine Francoise Marie Lefevre, Marin Rusu, Susan Schorr, Thomas Unold, Anna Morral, Jose A. Marquez, Mirjana Dimitrievska
Summary: This work explores the synthesis of BaZrS3 from Ba-Zr-O oxide precursor films sulfurized at temperatures ranging from 700 degrees C to 1000 degrees C. The diffusion of sulfur species in the film is identified as the rate-limiting step of this reaction. The processing temperature plays a significant role in determining the conversion from oxide to sulfide phase. BaZrS3 demonstrates a unique ability to accommodate non-stoichiometric compositions, unlike other chalcogenides.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Peter Sutter, Hannu-Pekka Komsa, Kim Kisslinger, Eli Sutter
Summary: The emergence of atomically thin crystals has allowed the integration of different 2D materials in lateral heterostructures. This can also be extended to thicker layered crystals by attaching a second van der Waals material layer by layer on suitable seed crystals. This study demonstrates the integration of multilayer crystals of SnS and GeSe through lateral epitaxy, showing promising applications in optoelectronics and managing charge and thermal transport.
Article
Chemistry, Multidisciplinary
Nicholas Morgan, Vladimir G. Dubrovskii, Ann-Kristin Stief, Didem Dede, Marie Sangle-Ferriere, Alok Rudra, Valerio Piazza, Anna Fontcuberta i Morral
Summary: This paper investigates the growth mechanisms and shape evolution of GaAs nanoridges on GaAs(100) substrates using selective area MOVPE. The growth process consists of three distinct stages, with the first stage showing step-flow growth behavior, the second stage forming {101} side facets while the (100) flat top facet shrinks, and the third stage involving overgrowth onto the mask with a reduced growth rate. A kinetic model is developed to accurately describe the width-dependent evolution of the nanoridge morphology in all three stages.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Eli Sutter, Peter Sutter
Summary: The integration of dissimilar materials into heterostructures is a main focus in modern materials science and technology. By combining 1D nanowires and 2D plates, mixed-dimensional heterostructures can be created with varying composition and dimensionality, resulting in larger contrast in electronic structures. Previous methods required multi-step growth processes, but this study demonstrates a single-step growth process using differences in precursor incorporation rates to synthesize mixed-dimensional heterostructures. This new approach opens up possibilities for complex heteroarchitectures.
Article
Energy & Fuels
Rajrupa Paul, Vanessa Conti, Mahdi Zamani, Simon Escobar-Steinvall, Hector Sanchez-Martin, Carlotta Gastaldi, Mihai Adrian Ionescu, Ignacio Iniquez-de-la-Torre, Mirjana Dimitrievska, Anna Fontcuberta i Morral, Valerio Piazza
Summary: This study reports the electrical properties of Zn3P2 thin films with different crystallinity grown on InP substrates, and correlates the crystalline quality and composition to the electrical properties. Capacitance-voltage measurements and secondary ion mass spectroscopy demonstrate the direct correlation between the carrier concentration and the Zn/P ratio. The highest hole mobility value (125 cm2/Vs) was obtained from high-quality single crystalline Zn3P2 thin films. Additionally, the electrical characteristics of the heterojunction between the thin film and the substrate were illustrated. This work sheds light on the electrical properties and conduction mechanism, thus providing a better understanding of the limitations and potentials of the electrical devices related to the material.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Physics, Applied
Pavel Gallina, Andrea Konecna, Jiri Liska, Juan Carlos Idrobo, Tomas Sikola
Summary: This study investigates a system that can strongly couple localized mid-infrared plasmon modes and phonon polaritons. The coupled modes are characterized using far-field infrared spectroscopy, monochromated electron energy-loss spectroscopy, numerical simulations, and analytical modeling. The results show that the electron probe allows precise characterization and active control of the coupled system in both frequency and space. The study establishes a rigorous description of the spectral features observed in light and electron-based spectroscopies and has potential applications in heat management and electromagnetic field concentration.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Eli Sutter, Hannu-Pekka Komsa, Jacob S. French, Peter Sutter
Summary: Alloying of 2D/layered chalcogenide semiconductors allows tuning of their electronic and optical properties. In this study, alloying in the GeSe-GeS system is investigated, and the composition dependence of the band gaps is studied using scanning transmission electron microscopy. The results show that the band gaps of GeS(x)Se1-x alloy micro- and nanowires increase systematically with the sulfur content and exhibit small bowing. Additionally, pronounced size effects in the alloy nanowires provide access to higher-energy optoelectronic transitions. Overall, germanium monochalcogenide alloys show promise for applications in optoelectronics and photovoltaics.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Peter Sutter, Raymond R. Unocic, Eli Sutter
Summary: This research presents a rational synthetic route for controlling the placement and tuning of single dislocations in van der Waals nanowires, allowing for the identification of their functional properties and potential technological applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Chunyi Huang, Didem Dede, Nicholas Morgan, Valerio Piazza, Xiaobing Hu, Anna Morral, Lincoln J. Lauhon
Summary: Selective area epitaxy is a promising method for defining nanowire networks in topological quantum computing. A strategy to promote Si dopant incorporation and suppress dopant diffusion in remote doped InGaAs nanowires templated by GaAs nanomembrane networks is reported. The growth of a dilute AlGaAs layer after doping the GaAs nanomembrane leads to the incorporation of Si, enabling precise control of the spacing between the Si donors and the undoped InGaAs channel; a simple model captures the influence of Al on the Si incorporation rate. Finite element modeling confirms the presence of high electron density in the channel.
Article
Nanoscience & Nanotechnology
Antonia Hager, Lucas Gueniat, Nicholas Morgan, Santhanu Panikar Ramanandan, Alok Rudra, Valerio Piazza, Anna Fontcuberta i Morral, Didem Dede
Summary: Semiconductor nanowires (NWs) in horizontal configuration can be used for scalable NW-based devices. Selective area epitaxy (SAE) through precise nanopatterning on growth masks enables bottom-up large-scale manufacturing of these nanostructures. Electron beam lithography offers high accuracy but is economically impractical for large-scale production. Nanoimprint lithography (NIL), on the other hand, is a more cost-effective alternative with the potential to significantly reduce fabrication time. In this study, we compare thermal and UV NIL for patterning substrates for SAE and find that UV NIL is superior in patterning sub-100 nm mask features at the wafer scale.
Article
Materials Science, Multidisciplinary
Andrea Giunto, Louise E. Webb, Thomas Hagger, Anna Fontcuberta i Morral
Summary: GeSn is a promising group-IV semiconductor material for on-chip Si photonics devices and high-mobility transistors. In this work, the potential utilization of indium (In) as a p-type dopant in GeSn is explored. The study reveals that In acts as a surfactant during the epitaxial growth of GeSn, leading to Sn segregation and affecting the material's local composition. The work provides insights on the limitations and discourages the use of in situ In doping of GeSn in optoelectronic devices.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Peter Sutter, Larousse Khosravi-Khorashad, Cristian V. V. Ciobanu, Eli Sutter
Summary: This study explores the chiroptical phenomena and dislocation effects in single nanowires by utilizing whispering gallery modes. The findings show that spiral growths occur in germanium(ii) sulfide (GeS) nanowires, due to a screw dislocation, which influences the electronic structure. These results establish the possibility of chiral light-matter interactions and dislocation-induced electronic modifications in single nanostructures.
MATERIALS HORIZONS
(2023)
