The Experts below are selected from a list of 115596 Experts worldwide ranked by ideXlab platform
Dirk Englund - One of the best experts on this subject based on the ideXlab platform.
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tunable and high purity room temperature single Photon Emission from atomic defects in hexagonal boron nitride
Nature Communications, 2017Co-Authors: Gabriele Grosso, Hyowon Moon, Benjamin Lienhard, Dmitri K. Efetov, Sajid Ali, Marco M. Furchi, Michael J. Ford, Igor Aharonovich, Pablo Jarilloherrero, Dirk EnglundAbstract:Two-dimensional van der Waals materials have emerged as promising platforms for solid-state quantum information processing devices with unusual potential for heterogeneous assembly. Recently, bright and photostable single Photon emitters were reported from atomic defects in layered hexagonal boron nitride (hBN), but controlling inhomogeneous spectral distribution and reducing multi-Photon Emission presented open challenges. Here, we demonstrate that strain control allows spectral tunability of hBN single Photon emitters over 6 meV, and material processing sharply improves the single Photon purity. We observe high single Photon count rates exceeding 7 × 106 counts per second at saturation, after correcting for uncorrelated Photon background. Furthermore, these emitters are stable to material transfer to other substrates. High-purity and photostable single Photon Emission at room temperature, together with spectral tunability and transferability, opens the door to scalable integration of high-quality quantum emitters in Photonic quantum technologies. Inhomogeneous spectral distribution and multi-Photon Emission are currently hindering the use of defects in layered hBN as reliable single Photon emitters. Here, the authors demonstrate strain-controlled wavelength tuning and increased single Photon purity through suitable material processing.
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Tunable and high-purity room temperature single-Photon Emission from atomic defects in hexagonal boron nitride
Nature Communications, 2017Co-Authors: Gabriele Grosso, Hyowon Moon, Benjamin Lienhard, Dmitri K. Efetov, Pablo Jarillo-herrero, Sajid Ali, Marco M. Furchi, Michael J. Ford, Igor Aharonovich, Dirk EnglundAbstract:Two-dimensional van der Waals materials have emerged as promising platforms for solid-state quantum information processing devices with unusual potential for heterogeneous assembly. Recently, bright and photostable single Photon emitters were reported from atomic defects in layered hexagonal boron nitride (hBN), but controlling inhomogeneous spectral distribution and reducing multi-Photon Emission presented open challenges. Here, we demonstrate that strain control allows spectral tunability of hBN single Photon emitters over 6 meV, and material processing sharply improves the single-Photon purity. We report high single Photon count rates exceeding 10^7 counts/sec at saturation, which is the highest single Photon detection rate for room-temperature single Photon emitters, to our knowledge. Furthermore, these emitters are stable to material transfer to other substrates. High-purity and photostable single Photon Emission at room temperature, together with spectral tunability and transferability, opens the door to scalable integration of high-quality quantum emitters in Photonic quantum technologies.
T Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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grb 110709a 111117a and 120107a faint high energy gamma ray Photon Emission from fermi lat observations and demographic implications
The Astrophysical Journal, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing Zhang, T SakamotoAbstract:Launched on 2008 June 11, the Large Area Telescope (LAT) instrument on board the Fermi Gamma-ray Space Telescope has provided a rare opportunity to study high-energy Photon Emission from gamma-ray bursts (GRBs). Althoughthemajorityofsuchevents(27)havebeenidentifiedbytheFermi-LATCollaboration,fourwereuncovered by using more sensitive statistical techniques. In this paper, we continue our earlier work by finding three more GRBs associated with high-energy Photon Emission, GRB 110709A, 111117A, and 120107A. To systematize our matched filter approach, a pipeline has been developed to identify these objects in nearly real time. GRB 120107A is the first product of this analysis procedure. Despite the reduced threshold for identification, the number of GRB events hasnot increased significantly. Thisrelative dearthofevents withlowPhoton number prompted astudyof the apparent Photon number distribution. We find an extremely good fit to a simple power law with an exponent of −1.8 ± 0.3 for the differential distribution. As might be expected, there is a substantial correlation between the number of lower energy Photons detected by the Gamma-ray Burst Monitor (GBM) and the number observed by LAT. Thus, high-energy Photon Emission is associated with some but not all of the brighter GBM events. Deeper studies of the properties of the small population of high-energy emitting bursts may eventually yield a better understanding of these entire phenomena.
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grb 110709a 111117a and 120107a faint high energy gamma ray Photon Emission from fermi lat observations and demographic implications
arXiv: High Energy Astrophysical Phenomena, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing Zhang, T SakamotoAbstract:Launched on June 11, 2008, the LAT instrument onboard the $Fermi$ Gamma-ray Space Telescope has provided a rare opportunity to study high energy Photon Emission from gamma-ray bursts. Although the majority of such events (27) have been iden tified by the Fermi LAT Collaboration, four were uncovered by using more sensiti ve statistical techniques (Akerlof et al 2010, Akerlof et al 2011, Zheng et al 2 012). In this paper, we continue our earlier work by finding three more GRBs ass ociated with high energy Photon Emission, GRB 110709A, 111117A and 120107A. To s ystematize our matched filter approach, a pipeline has been developed to identif y these objects in near real time. GRB 120107A is the first product of this anal ysis procedure. Despite the reduced threshold for identification, the number of GRB events has not increased significantly. This relative dearth of events with low Photon number prompted a study of the apparent Photon number distribution. W e find an extremely good fit to a simple power-law with an exponent of -1.8 $\pm $ 0.3 for the differential distribution. As might be expected, there is a substa ntial correlation between the number of lower energy Photons detected by the GBM and the number observed by the LAT. Thus, high energy Photon Emission is associ ated with some but not all of the brighter GBM events. Deeper studies of the pro perties of the small population of high energy emitting bursts may eventually yi eld a better understanding of these entire phenomena.
Keiichiro Kuronuma - One of the best experts on this subject based on the ideXlab platform.
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prognostic value of phase analysis for predicting adverse cardiac events beyond conventional single Photon Emission computed tomography variables results from the refine spect registry
Circulation-cardiovascular Imaging, 2021Co-Authors: Keiichiro Kuronuma, Robert J H Miller, Yuka Otaki, Serge D Van Kriekinge, Marcio A Diniz, Tali Sharir, Heidi Gransar, Joanna X LiangAbstract:Background: Phase analysis of single-Photon Emission computed tomography myocardial perfusion imaging provides dyssynchrony information which correlates well with assessments by echocardiography, b...
Bing Zhang - One of the best experts on this subject based on the ideXlab platform.
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grb 110709a 111117a and 120107a faint high energy gamma ray Photon Emission from fermi lat observations and demographic implications
The Astrophysical Journal, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing Zhang, T SakamotoAbstract:Launched on 2008 June 11, the Large Area Telescope (LAT) instrument on board the Fermi Gamma-ray Space Telescope has provided a rare opportunity to study high-energy Photon Emission from gamma-ray bursts (GRBs). Althoughthemajorityofsuchevents(27)havebeenidentifiedbytheFermi-LATCollaboration,fourwereuncovered by using more sensitive statistical techniques. In this paper, we continue our earlier work by finding three more GRBs associated with high-energy Photon Emission, GRB 110709A, 111117A, and 120107A. To systematize our matched filter approach, a pipeline has been developed to identify these objects in nearly real time. GRB 120107A is the first product of this analysis procedure. Despite the reduced threshold for identification, the number of GRB events hasnot increased significantly. Thisrelative dearthofevents withlowPhoton number prompted astudyof the apparent Photon number distribution. We find an extremely good fit to a simple power law with an exponent of −1.8 ± 0.3 for the differential distribution. As might be expected, there is a substantial correlation between the number of lower energy Photons detected by the Gamma-ray Burst Monitor (GBM) and the number observed by LAT. Thus, high-energy Photon Emission is associated with some but not all of the brighter GBM events. Deeper studies of the properties of the small population of high-energy emitting bursts may eventually yield a better understanding of these entire phenomena.
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grb 110709a 111117a and 120107a faint high energy gamma ray Photon Emission from fermi lat observations and demographic implications
arXiv: High Energy Astrophysical Phenomena, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing Zhang, T SakamotoAbstract:Launched on June 11, 2008, the LAT instrument onboard the $Fermi$ Gamma-ray Space Telescope has provided a rare opportunity to study high energy Photon Emission from gamma-ray bursts. Although the majority of such events (27) have been iden tified by the Fermi LAT Collaboration, four were uncovered by using more sensiti ve statistical techniques (Akerlof et al 2010, Akerlof et al 2011, Zheng et al 2 012). In this paper, we continue our earlier work by finding three more GRBs ass ociated with high energy Photon Emission, GRB 110709A, 111117A and 120107A. To s ystematize our matched filter approach, a pipeline has been developed to identif y these objects in near real time. GRB 120107A is the first product of this anal ysis procedure. Despite the reduced threshold for identification, the number of GRB events has not increased significantly. This relative dearth of events with low Photon number prompted a study of the apparent Photon number distribution. W e find an extremely good fit to a simple power-law with an exponent of -1.8 $\pm $ 0.3 for the differential distribution. As might be expected, there is a substa ntial correlation between the number of lower energy Photons detected by the GBM and the number observed by the LAT. Thus, high energy Photon Emission is associ ated with some but not all of the brighter GBM events. Deeper studies of the pro perties of the small population of high energy emitting bursts may eventually yi eld a better understanding of these entire phenomena.
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faint high energy gamma ray Photon Emission of grb 081006a from fermi observations
The Astrophysical Journal, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing ZhangAbstract:Since the launch of the Fermi Gamma-ray Space Telescope on 2008 June 11, the Large Area Telescope (LAT) instrument has firmly detected more than 20 gamma-ray bursts (GRBs) with high-energy Photon Emission above 100 MeV. Using the matched filter technique, three more GRBs have also shown evidence of correlation with highenergy Photon Emission as demonstrated by Akerlof et al. In this paper, we present another GRB, GRB 081006A, unambiguously detected by the matched filter technique. This event is associated with more than 13 high-energy Photons above 100 MeV. The likelihood analysis code provided by the Fermi Science Support Center generated an independent verification of this detection using a comparison of the test statistics value with similar calculations for random LAT data fields. We have performed detailed temporal and spectral analysis of Photons from 8 keV up to 0.8 GeV from the Gamma-ray Burst Monitor and the LAT. The properties of GRB 081006A can be compared to those of the other two long-duration GRBs detected at similar significance, GRB 080825C and GRB 090217A. We find that GRB 081006A is more similar to GRB 080825C with comparable appearances of late high-energy Photon Emission. As demonstrated previously, there appears to be a surprising dearth of faint LAT GRBs, with only one additional GRB identified in a sample of 74. In this unique period when both Swift and Fermi are operational, there is some urgency to explore this aspect of GRBs as fully as possible. Key word: gamma-ray burst: individual (GRB 081006A) Online-only material: color figures
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faint high energy gamma ray Photon Emission of grb 081006a from fermi observations
arXiv: High Energy Astrophysical Phenomena, 2012Co-Authors: W Zheng, C Akerlof, S B Pandey, T A Mckay, Binbin Zhang, Bing ZhangAbstract:Since the launch of the Fermi gamma - ray Space Telescope on June 11, 2008, the LAT instrument has solidly detected more than 20 GRBs with high energy Photon Emission above 100 MeV. Using the matched filter technique, 3 more GRBs have also shown evidence of correlation with high energy Photon Emission as demonstrated by Akerlof et al. In this paper, we present another GRB unambiguously detected by the matched filter technique, GRB 081006A. This event is associated with more than 13 high energy Photons above 100 MeV. The likelihood analysis code provided by the $Fermi$ Science Support Center (FSSC) generated an independent verification of this detection by comparison of the Test Statistics (TS) value with similar calculations for random LAT data fields. We have performed detailed temporal and spectral analysis of Photons from 8 keV up to 0.8 GeV from the GBM and the LAT. The properties of GRB 081006A can be compared to the other two long duration GRBs detected at similar significance, GRB 080825C and GRB 090217A. We find that GRB 081006A is more similar to GRB 080825C with comparable appearances of late high energy Photon Emission. As demonstrated previously, there appears to be a surprising dearth of faint LAT GRBs, with only one additional GRB identified in a sample of 74 GRBs. In this unique period when both $Swift$ and $Fermi$ are operational, there is some urgency to explore this aspect of GRBs as fully as possible.
Dimas G De Oteyza - One of the best experts on this subject based on the ideXlab platform.
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single Photon Emission from a plasmonic light source driven by a local field induced coulomb blockade
ACS Nano, 2020Co-Authors: Christopher C Leon, Anna Roslawska, Pablo Merino, Abhishek Grewal, O. Gunnarsson, Dimas G De Oteyza, Klaus KuhnkeAbstract:A hallmark of quantum control is the ability to manipulate quantum Emission at the nanoscale. Through scanning tunneling microscopy-induced luminescence (STML), we are able to generate plasmonic light originating from inelastic tunneling processes that occur in the vacuum between a tip and a few-nanometer-thick molecular film of C60 deposited on Ag(111). Single Photon Emission, not of molecular excitonic origin, occurs with a 1/e recovery time of a tenth of a nanosecond or less, as shown through Hanbury Brown and Twiss Photon intensity interferometry. Tight-binding calculations of the electronic structure for the combined tip and Ag-C60 system results in good agreement with experiment. The tunneling happens through electric-field-induced split-off states below the C60 LUMO band, which leads to a Coulomb blockade effect and single Photon Emission. The use of split-off states is shown to be a general technique that has special relevance for narrowband materials with a large bandgap.
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single Photon Emission from a plasmonic light source driven by a local field induced coulomb blockade
arXiv: Mesoscale and Nanoscale Physics, 2019Co-Authors: Christopher C Leon, Anna Roslawska, Pablo Merino, Abhishek Grewal, Klaus Kuhnke, O. Gunnarsson, Dimas G De Oteyza, Klaus KernAbstract:A hallmark of quantum control is the ability to make Photons at the nanoscale whose temporal features are distinct from classical light sources. Through scanning tunneling microscopy induced luminescence (STML) we are able to generate plasmonic light originating from inelastic tunneling processes that occur in a few-nanometer thick molecular film of C$_{60}$ deposited on Ag(111). Single Photon Emission, not of excitonic origin, occurs with a 1/$e$ lifetime of a tenth of a nanosecond or less, as shown through Hanbury Brown and Twiss Photon intensity interferometry. We have performed tight-binding calculations of the electronic structure for the combined Ag-C$_{60}$-tip system and obtained good agreement with experiment. The tunneling happens through electric field induced split-off states below the C$_{60}$ LUMO band, which leads to a Coulomb blockade effect and single Photon Emission. The use of split-off states is shown to be a general technique that has special relevance for narrowband materials with a large bandgap.