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David C, Gorelick S, Rutishauser S, Krzywinski J, Vila-Comamala J, Guzenko VA, Bunk O, Färm E, Ritala M, Cammarata M, Fritz DM, Barrett R, Samoylova L, Grünert J, Sinn H. Author Correction: Nanofocusing of hard X-ray free electron laser pulses using diamond based Fresnel zone plates. Sci Rep 2020; 10:6282. [PMID: 32269231 PMCID: PMC7142139 DOI: 10.1038/s41598-020-62784-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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2
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Lebugle M, Seniutinas G, Marschall F, Guzenko VA, Grolimund D, David C. Tunable kinoform x-ray beam splitter. Opt Lett 2017; 42:4327-4330. [PMID: 29088155 DOI: 10.1364/ol.42.004327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 09/06/2017] [Indexed: 06/07/2023]
Abstract
We demonstrate an x-ray beam splitter with high performances for multi-kilo-electron-volt photons. The device is based on diffraction on kinoform structures, which overcome the limitations of binary diffraction gratings. This beam splitter achieves a dynamical splitting ratio in the range 0-99.1% by tilting the optics and is tunable, here shown in a photon energy range of 7.2-19 keV. High diffraction efficiency of 62.6%, together with an extinction ratio of 0.6%, is demonstrated at 12.4 keV, with angular separation for the split beam of 0.5 mrad. This device can find applications in beam monitoring at synchrotrons, at x-ray free electron lasers for online diagnostics and beamline multiplexing and, possibly, as key elements for delay lines or ultrashort x-ray pulses manipulation.
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Pedrini B, Menzel A, Guzenko VA, David C, Abela R, Gutt C. Model-independent particle species disentanglement by X-ray cross-correlation scattering. Sci Rep 2017; 7:45618. [PMID: 28374754 PMCID: PMC5379484 DOI: 10.1038/srep45618] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 03/01/2017] [Indexed: 11/09/2022] Open
Abstract
Mixtures of different particle species are often investigated using the angular averages of the scattered X-ray intensity. The number of species is deduced by singular value decomposition methods. The full disentanglement of the data into per-species contributions requires additional knowledge about the system under investigation. We propose to exploit higher-order angular X-ray intensity correlations with a new computational protocol, which we apply to synchrotron data from two-species mixtures of two-dimensional static test nanoparticles. Without any other information besides the correlations, we demonstrate the assessment of particle species concentrations in the measured data sets, as well as the full ab initio reconstruction of both particle structures. The concept extends straightforwardly to more species and to the three-dimensional case, whereby the practical application will require the measurements to be performed at an X-ray free electron laser.
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Affiliation(s)
- B Pedrini
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - A Menzel
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - V A Guzenko
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - C David
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - R Abela
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - C Gutt
- Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068, Siegen, Germany
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Fülöp G, Domínguez F, d'Hollosy S, Baumgartner A, Makk P, Madsen MH, Guzenko VA, Nygård J, Schönenberger C, Levy Yeyati A, Csonka S. Magnetic Field Tuning and Quantum Interference in a Cooper Pair Splitter. Phys Rev Lett 2015; 115:227003. [PMID: 26650317 DOI: 10.1103/physrevlett.115.227003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Indexed: 06/05/2023]
Abstract
Cooper pair splitting (CPS) is a process in which the electrons of the naturally occurring spin-singlet pairs in a superconductor are spatially separated using two quantum dots. Here, we investigate the evolution of the conductance correlations in an InAs CPS device in the presence of an external magnetic field. In our experiments the gate dependence of the signal that depends on both quantum dots continuously evolves from a slightly asymmetric Lorentzian to a strongly asymmetric Fano-type resonance with increasing field. These experiments can be understood in a simple three-site model, which shows that the nonlocal CPS leads to symmetric line shapes, while the local transport processes can exhibit an asymmetric shape due to quantum interference. These findings demonstrate that the electrons from a Cooper pair splitter can propagate coherently after their emission from the superconductor and how a magnetic field can be used to optimize the performance of a CPS device. In addition, the model calculations suggest that the estimate of the CPS efficiency in the experiments is a lower bound for the actual efficiency.
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Affiliation(s)
- G Fülöp
- Department of Physics, Budapest University of Technology and Economics, and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki út 8, 1111 Budapest, Hungary
| | - F Domínguez
- Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC), and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - S d'Hollosy
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - A Baumgartner
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - P Makk
- Department of Physics, Budapest University of Technology and Economics, and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki út 8, 1111 Budapest, Hungary
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - M H Madsen
- Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - V A Guzenko
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J Nygård
- Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - C Schönenberger
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - A Levy Yeyati
- Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC), and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - S Csonka
- Department of Physics, Budapest University of Technology and Economics, and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki út 8, 1111 Budapest, Hungary
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d'Hollosy S, Jung M, Baumgartner A, Guzenko VA, Madsen MH, Nygård J, Schönenberger C. Gigahertz Quantized Charge Pumping in Bottom-Gate-Defined InAs Nanowire Quantum Dots. Nano Lett 2015; 15:4585-4590. [PMID: 26086240 DOI: 10.1021/acs.nanolett.5b01190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Semiconducting nanowires (NWs) are a versatile, highly tunable material platform at the heart of many new developments in nanoscale and quantum physics. Here, we demonstrate charge pumping, that is, the controlled transport of individual electrons through an InAs NW quantum dot (QD) device at frequencies up to 1.3 GHz. The QD is induced electrostatically in the NW by a series of local bottom gates in a state of the art device geometry. A periodic modulation of a single gate is enough to obtain a dc current proportional to the frequency of the modulation. The dc bias, the modulation amplitude and the gate voltages on the local gates can be used to control the number of charges conveyed per cycle. Charge pumping in InAs NWs is relevant not only in metrology as a current standard, but also opens up the opportunity to investigate a variety of exotic states of matter, for example, Majorana modes, by single electron spectroscopy and correlation experiments.
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Affiliation(s)
- S d'Hollosy
- †Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - M Jung
- †Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - A Baumgartner
- †Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - V A Guzenko
- ‡Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - M H Madsen
- §Center for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - J Nygård
- §Center for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - C Schönenberger
- †Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
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Pedrini B, Menzel A, Guizar-Sicairos M, Guzenko VA, Gorelick S, David C, Patterson BD, Abela R. Two-dimensional structure from random multiparticle X-ray scattering images using cross-correlations. Nat Commun 2013; 4:1647. [PMID: 23552062 DOI: 10.1038/ncomms2622] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 02/19/2013] [Indexed: 11/09/2022] Open
Abstract
Knowledge of the structure of biological macromolecules, especially in their native environment, is crucial because of the close structure-function relationship. X-ray small-angle scattering is used to determine the shape of particles in solution, but the achievable resolution is limited owing to averaging over particle orientations. In 1977, Kam proposed to obtain additional structural information from the cross-correlation of the scattering intensities. Here we develop the method in two dimensions, and give a procedure by which the single-particle diffraction pattern is extracted in a model-independent way from the correlations. We demonstrate its application to a large set of synchrotron X-ray scattering images on ensembles of identical, randomly oriented particles of 350 or 200 nm in size. The obtained 15 nm resolution in the reconstructed shape is independent of the number of scatterers. The results are discussed in view of proposed 'snapshot' scattering by molecules in the liquid phase at X-ray free-electron lasers.
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Affiliation(s)
- B Pedrini
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
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Garganourakis M, Scagnoli V, Huang SW, Staub U, Wadati H, Nakamura M, Guzenko VA, Kawasaki M, Tokura Y. Imprinting magnetic information in manganites with x rays. Phys Rev Lett 2012; 109:157203. [PMID: 23102361 DOI: 10.1103/physrevlett.109.157203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Indexed: 06/01/2023]
Abstract
The effect of x rays on an orbital and charge ordered epitaxial film of a Pr0.5Ca0.5MnO3 is presented. As the film is exposed to x rays, the antiferromagnetic response increases and concomitantly the conductivity of the film improve. These results are discussed in terms of a persistent x-ray induced doping, leading to a modification of the magnetic structure. This effect allows writing electronic and magnetic information in the film and represents a novel way of manipulating magnetism.
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Affiliation(s)
- M Garganourakis
- Swiss Light Source, Paul Scherrer Institut, CH 5232 Villigen PSI, Switzerland
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Tarasov A, Wipf M, Bedner K, Kurz J, Fu W, Guzenko VA, Knopfmacher O, Stoop RL, Calame M, Schönenberger C. True reference nanosensor realized with silicon nanowires. Langmuir 2012; 28:9899-9905. [PMID: 22631046 DOI: 10.1021/la301555r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Conventional gate oxide layers (e.g., SiO(2), Al(2)O(3), or HfO(2)) in silicon field-effect transistors (FETs) provide highly active surfaces, which can be exploited for electronic pH sensing. Recently, great progress has been achieved in pH sensing using compact integrateable nanowire FETs. However, it has turned out to be much harder to realize a true reference electrode, which--while sensing the electrostatic potential--does not respond to the proton concentration. In this work, we demonstrate a highly effective reference sensor, a so-called reference FET, whose proton sensitivity is suppressed by as much as 2 orders of magnitude. To do so, the Al(2)O(3) surface of a nanowire FET was passivated with a self-assembled monolayer of silanes with a long alkyl chain. We have found that a full passivation can be achieved only after an extended period of self-assembling lasting several days at 80 °C. We use this slow process to measure the number of active proton binding sites as a function of time by a quantitative comparison of the measured nonlinear pH-sensitivities to a theoretical model (site-binding model). Furthermore, we have found that a partially passivated surface can sense small changes in the number of active binding sites reaching a detection limit of δN(s) ≈ 170 μm(-2) Hz(-1/2) at 10 Hz and pH 3.
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Affiliation(s)
- A Tarasov
- Department of Physics, University of Basel, Basel, Switzerland.
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David C, Gorelick S, Rutishauser S, Krzywinski J, Vila-Comamala J, Guzenko VA, Bunk O, Färm E, Ritala M, Cammarata M, Fritz DM, Barrett R, Samoylova L, Grünert J, Sinn H. Nanofocusing of hard X-ray free electron laser pulses using diamond based Fresnel zone plates. Sci Rep 2011; 1:57. [PMID: 22355576 PMCID: PMC3216544 DOI: 10.1038/srep00057] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 07/15/2011] [Indexed: 11/18/2022] Open
Abstract
A growing number of X-ray sources based on the free-electron laser (XFEL) principle are presently under construction or have recently started operation. The intense, ultrashort pulses of these sources will enable new insights in many different fields of science. A key problem is to provide x-ray optical elements capable of collecting the largest possible fraction of the radiation and to focus into the smallest possible focus. As a key step towards this goal, we demonstrate here the first nanofocusing of hard XFEL pulses. We developed diamond based Fresnel zone plates capable of withstanding the full beam of the world's most powerful x-ray laser. Using an imprint technique, we measured the focal spot size, which was limited to 320 nm FWHM by the spectral band width of the source. A peak power density in the focal spot of 4×1017 W/cm2 was obtained at 70 fs pulse length.
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Affiliation(s)
- C David
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
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Vila-Comamala J, Jefimovs K, Pilvi T, Ritala M, Sarkar SS, Solak HH, Guzenko VA, Stampanoni M, Marone F, Raabe J, Tzvetkov G, Fink RH, Grolimund D, Borca CN, Kaulich B, David C. Advanced X-ray diffractive optics. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/186/1/012078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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