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Journal of Applied Physics 133, 083901 (2023)
A Brillouin light scattering study of the spin-wave magnetic field dependence in a magnetic hybrid system made of an artificial spin-ice structure and a film underlayer
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We present a combined Brillouin light scattering (BLS) and micromagnetic simulation investigation of the magnetic-field-dependent spin-wave spectra in a hybrid structure made of permalloy (NiFe) artificial spin-ice (ASI) systems, composed of stadium-shaped nanoislands, deposited on the top of an unpatterned permalloy film with a nonmagnetic spacer layer. The thermal spin-wave spectra were recorded by BLS as a function of the magnetic field applied along the symmetry direction of the ASI sample. Magneto-optic Kerr effect magnetometry was used to measure the hysteresis loops in the same orientation as the BLS measurements. The frequency and the intensity of several spin-wave modes detected by BLS were measured as a function of the applied magnetic field. Micromagnetic simulations enabled us to identify the modes in terms of their frequency and spatial symmetry and to extract information about the existence and strength of the dynamic coupling, relevant only to a few modes of a given hybrid system. Using this approach, we suggest a way to understand if the dynamic coupling between ASI and film modes is present or not, with interesting implications for the development of future three-dimensional magnonic applications and devices.
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from our users
ACS Nano 2023, 17, 3, 2089–2100
Strongly Confined CsPbBr3 Quantum Dots as Quantum Emitters and Building Blocks for Rhombic Superlattices
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The success of the colloidal semiconductor quantum dots (QDs) field is rooted in the precise synthetic control of QD size, shape, and composition, enabling electroni-cally well-defined functional nanomaterials that foster funda-mental science and motivate diverse fields of applications. While the exploitation of the strong confinement regime has been driving commercial and scientific interest in InP or CdSe QDs, such a regime has still not been thoroughly explored and exploited for lead-halide perovskite QDs, mainly due to a so far insufficient chemical stability and size monodispersity of perovskite QDs smaller than about 7 nm. Here, we demonstrate chemically stable strongly confined 5 nm CsPbBr3 colloidal QDs via a postsynthetic treatment employing didodecyldimethylam-monium bromide ligands. The achieved high size monodispersity (7.5% +/- 2.0%) and shape-uniformity enables the self-assembly of QD superlattices with exceptional long-range order, uniform thickness, an unusual rhombic packing with an obtuse angle of 104 degrees, and narrow-band cyan emission. The enhanced chemical stability indicates the promise of strongly confined perovskite QDs for solution-processed single-photon sources, with single QDs showcasing a high single-photon purity of 73% and minimal blinking (78% "on" fraction), both at room temperature.
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our research
PRX Quantum 4, 010201
Quantum Electrodynamics of Intense Laser-Matter Interactions: A Tool for Quantum State Engineering
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Intense laser-matter interactions are at the center of interest in research and technology since the development of high-power lasers. They have been widely used for fundamental studies in atomic, molecular, and optical physics, and they are at the core of attosecond physics and ultrafast optoelectronics. Although the majority of these studies have been successfully described using classical electromagnetic fields, recent investigations based on fully quantized approaches have shown that intense laser-atom interactions can be used for the generation of controllable high-photon-number entangled coherent states and coherent state superpositions. In this tutorial, we provide a comprehensive fully quantized description of intense laser-atom interactions. We elaborate on the processes of high-harmonic generation, above-threshold ionization, and we discuss new phenomena that cannot be revealed within the context of semiclassical theories. We provide the description for conditioning the light field on different electronic processes, and their consequences for quantum state engineering of light. Finally, we discuss the extension of the approach to more complex materials, and the impact to quantum technologies for a new photonic platform composed of the symbiosis of attosecond physics and quantum information science.
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Deliverables view all
WP2 - MGT2 - Pilot scheme for the management of a distributed research infrastructure offering harmonised, interoperable and integrated services
D2.4 - First call for additional providers
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According to the Grant Agreement, in the lifetime of NFFA-Europe Pilot the Transnational Access offer must enlarge to meet (i) the qualitative needs of users that could be better met with new specialized providers, or (ii) quantitative needs resulting in oversubscription of the current capacity. To this aim, two calls for additional access providers were foreseen at M24 and M40, respectively. This report describes the rationale that led to the text of the first call for additional access providers, i.e. from the evaluation of the needs – mainly based on the analysis provided in the deliverable D2.3 “First balance of access provision” - to the search for alternative solutions to widen and strengthen the current offer.
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WP11 - JA1 - Real-time observation and control in microscopy and spectroscopy of nanoobjects
D11.3 - Development of FWM setup with extended wave-vector region and with 20 fs time duration
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During the second year of the NEP project, the development and extension of a Four-Wave-Mixing (FWM) technique, called Transient Grating (TG), has been continued and finalized. The deliverable has been postponed due to a huge problem with the main laser that was stopped for a very long period. The requirement to short pulse length didn’t allow the use of a different laser currently available in our lab. The main scope of this deliverable is the development of a FWM setup (in detail, TG), based on short pulse duration and covering an extended wave vector region, allowing to probe various dynamical ranges, not reachable by already existing schemes. The new setup was installed at SPRINT lab of the Istituto Officina dei Materiali (IOM) of Consiglio Nazionale dellle Ricerche (CNR) in Trieste. The TG approach is mainly devoted to the excitation and detection of optical and acoustic phonons in materials. In the first case, a very short pulse duration is required, in order to follow the typical high frequencies of optical phonons (THz range). In the second case, the possibility of varying the induced wave-vector in the sample allows to measure the dispersion of acoustic phonons, and so the speed of sound extraction. The explored wave-vector region in standard laser-based TG setup is limited by the use of special optics, which cannot allow for large angles between pump pulses. The same optics fix a finite number of selected wave-vectors, not variable in a continuous way. Moreover, the use of very long pulses (hundreds of fs) in TG devoted to acoustic phonons, doesn’t allow to measure contemporary the optical ones. Here we propose a new setup for measuring both optical and acoustic phonons, with a continuous variation of the induced wave-vector, which is also extended above any previous setup. The system has been tested on various samples, and the measured frequencies have been compared with the literature. In detail, we report the analysis on optical phonons on alfa-quartz and optical and acoustic phonons on a glass slab, covering a wave-vector region up to 10 um-1.
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WP13 - JA3 Nano-engineering and pattern transfer methods
D13.2 - High resolution lithography methods: performance and figure of merit
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The Joint Activity JA3 (WP13) is aiming at development of methods of high-resolution lithography and pattern transfer by collaborative efforts of all four participants of the WP. Among the goals of the JA3 one can mention extended applicability of the tools offered in TA and new functionalities in lithographic and patterning techniques to be available among the TA providers. Both “top-down” and “bottom-up” lithographic approaches that include high-resolution optical Talbot displacement lithography, thermal scanning probe lithography, He+ ion beams and block copolymers are being used within the JA. Those lithographic methods are combined with high-resolution patterning, such as reactive ion etching and atomic layer etching. We focus our activity to provide relevant packages of nano-engineering methods combined with optimum protocols and know-how. The results generated within the current JA will be used in other work packages, such as WP14 and WP 15.
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Transnational Access Statistics
19 calls for access
646 proposals submitted
63% rate of acceptance
31% with Large Scale Facilities
13% with theory
12% with industry
~3 average users per proposal
58 countries applying
1924 lab sessions