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Magnetic Polaron Formation Dynamics in Mn^(2+)-Doped Colloidal Nanocrystals up to Room Temperature
Gerd Bacher,Lars Schneider,Rémi Beaulac,Paul I. Archer,Daniel R. Gamelin 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
The dynamics of exciton magnetic polaron (EMP) formation after pulsed laser excitation is studied in Mn^(2+)-doped colloidal CdSe nanocrystals. A transient energy shift of more than 130 meV at low temperature is obtained for the characteristic photoluminescence signal, and is related to the alignment of the Mn^(2+)-ion spins in the exchange field of the optically generated electron-hole pairs. The dynamics of laser induced magnetization are characterized by at least two time constants attributed to the EMP formation within a few hundreds of picoseconds, followed by a subsequent reorientation of the EMP spin complex in the nanosecond regime. We found a complete spin alignment up to temperatures of about 50 K and clear signatures of optically induced magnetization up to room temperature.
<sup>188</sup>Re-HDD/Lipiodol Therapy for Hepatocellular Carcinoma: A Phase I Clinical Trial
Lambert, B.,Bacher, K.,Defreyne, L.,Gemmel, F.,Van Vlierberghe, H.,Jeong, J. M.,Dierckx, R. A.,Van de Wiele, C.,Thierens, H.,De Vos, F. THE SOCIETY OF NUCLEAR MEDICINE INC 2005 The Journal of nuclear medicine Vol.46 No.1
Belle II SVD ladder assembly procedure and electrical qualification
Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, Varghese,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, T.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, T.,Bettarini, S.,Bhuyan, Elsevier 2016 Nuclear instruments & methods in physics research. Vol.824 No.-
<P><B>Abstract</B></P> <P>The Belle II experiment at the SuperKEKB asymmetric <SUP> e + </SUP> <SUP> e − </SUP> collider in Japan will operate at a luminosity approximately 50 times larger than its predecessor (Belle). At its heart lies a six-layer vertex detector comprising two layers of pixelated silicon detectors (PXD) and four layers of double-sided silicon microstrip detectors (SVD). One of the key measurements for Belle II is time-dependent CP violation asymmetry, which hinges on a precise charged-track vertex determination. Towards this goal, a proper assembly of the SVD components with precise alignment ought to be performed and the geometrical tolerances should be checked to fall within the design limits. We present an overview of the assembly procedure that is being followed, which includes the precision gluing of the SVD module components, wire-bonding of the various electrical components, and precision three dimensional coordinate measurements of the jigs used in assembly as well as of the final SVD modules.</P>
Chemical Synthesis, Doping, and Transformation of Magic-Sized Semiconductor Alloy Nanoclusters
Yang, Jiwoong,Muckel, Franziska,Baek, Woonhyuk,Fainblat, Rachel,Chang, Hogeun,Bacher, Gerd,Hyeon, Taeghwan American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.19
<P>Nanoclusters are important prenucleation intermediates for colloidal nanocrystal synthesis. In addition, they exhibit many intriguing properties originating from their extremely small size lying between molecules and typical nanocrystals. However, synthetic control of multicomponent semiconductor nanoclusters remains a daunting goal. Here, we report on the synthesis, doping, and transformation of multielement magic-sized clusters, generating the smallest semiconductor alloys. We use Lewis acid base reactions at room temperature to synthesize alloy dusters containing three or four types of atoms. Mass spectrometry reveals that the alloy clusters exhibit 'magic-size' characteristics with chemical formula of ZnxCd13-xSe13 (x = 0-13) whose compositions are tunable between CdSe and ZnSe. Successful doping of these clusters creates a new class of diluted magnetic semiconductors in the extreme quantum confinement regime. Furthermore, the important role of these alloy clusters as prenucleation intermediates is demonstrated by low temperature transformation into quantum alloy nanoribbons and nanorods. Our study will facilitate the understanding of these novel diluted magnetic semiconductor nanoclusters, and offer new possibilities for the controlled synthesis of nanomaterials at the prenucleation stage, consequently producing novel multicomponent nanomaterials that are difficult to synthesize.</P>
Belle-II VXD radiation monitoring and beam abort with sCVD diamond sensors
Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, T.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, T.,Bettarini, S.,Bhuyan, B.,Bil Elsevier 2016 Nuclear instruments & methods in physics research. Vol.824 No.-
<P><B>Abstract</B></P> <P>The Belle-II VerteX Detector (VXD) has been designed to improve the performances with respect to Belle and to cope with an unprecedented luminosity of 8 × <SUP> 10 35 </SUP> <SUP> cm − 2 </SUP> <SUP> s − 1 </SUP> achievable by the SuperKEKB. Special care is needed to monitor both the radiation dose accumulated throughout the life of the experiment and the instantaneous radiation rate, in order to be able to promptly react to sudden spikes for the purpose of protecting the detectors. A radiation monitoring and beam abort system based on single-crystal diamond sensors is now under an active development for the VXD. The sensors will be placed in several key positions in the vicinity of the interaction region. The severe space limitations require a challenging remote readout of the sensors.</P>
The Belle II silicon vertex detector: Assembly and initial results
Thalmeier, R.,Casarosa, G.,Schwanda, C.,Aihara, H.,Aziz, T.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bertacchi, V.,Betta Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.936 No.-
<P><B>Abstract</B></P> <P>The “chip-on-sensor” concept of this detector minimizes the distance of the signal propagation from the double-sided silicon detector strips to the readout chips and thus reduces noise from strip capacitance. One half of the detector is built, the second half is being assembled at the time of writing. Prototypes have been tested in several test beams as well as in the so-called Phase 2 setup inside the detector structure. First results from a commissioning run of the Belle-II prototype SVD detector are presented. The measured signal-to-noise and timing performance are found to be according to design specifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Belle-II Silicon Vertex Detector is based on a “chip-on-sensor” concept. </LI> <LI> One half of the detector is built, the second half is being assembled. </LI> <LI> Prototypes have been tested in a commissioning run inside the detector structure. </LI> <LI> The measured SNR and hit time are found to be according to design specifications. </LI> </UL> </P>