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Villard, L.*; Bottino, A.*; Brunner, S.*; Casati, A.*; Chowdhury, J.*; Dannert, T.*; Ganesh, R.*; Garbet, X.*; G
rler, T.*; Grandgirard, V.*; et al.
Plasma Physics and Controlled Fusion, 52(12), p.124038_1 - 124038_18, 2010/11
Times Cited Count：18 Percentile：56.51(Physics, Fluids & Plasmas)
2 single-domain surfaceYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
Hyomen Kagaku, 29(7), p.401 - 406, 2008/07
Widely well-defined Si(110)-162 single-domain surface has been fabricated utilizing the electromigration of the surface atoms. Tuning the direction of the dc during resistive heating to that of the surface reconstruction row realizes an alignment of the rows in one direction producing a mm-wide single-domain of 162 structure. The fabricated single-domain shows number of useful characteristics such as a strong one-dimensionality and the surface homochirality, suggesting various applications.
Yamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
Physical Review B, 77(15), p.153305_1 - 153305_3, 2008/04
Times Cited Count：17 Percentile：58.3(Materials Science, Multidisciplinary)A widely well-defined homochiral surface is realized on Si(110), manipulating surface reconstruction by electromigration. Controlled switching of the surface handedness has also been demonstrated. In addition, by means of hydrogen passivation, the surface is sufficiently stabilized while surface chirality is conserved. These findings suggest the possible use of Si(110) as a heterogeneous catalyst for enantioselective chemical reactions.
2 surface fabricated by electromigrationYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
Physical Review B, 76(15), p.153309_1 - 153309_4, 2007/10
Times Cited Count：29 Percentile：73.07(Materials Science, Multidisciplinary)Micrometer-wide, single-domain of Si(110)-162 reconstruction has been fabricated by means of controlled electromigration of surface atoms. The electromigration effect in DC heating process is found to line-up the reconstruction rows when the current direction matches to the orientation of the rows. This finding provides not only a well-controlled surface preparation method for Si(110), but also a new template for low-dimensional nanostructures.
Asaoka, Hidehito; Yamada, Yoichi; Yamazaki, Tatsuya; Girard, A.*; Yamamoto, Hiroyuki; Shamoto, Shinichi; Arnoldo, A.*; Goto, Seiichi*; Suemitsu, Maki*
no journal, ,
We reports the recent progress about structural formation on semiconductor surface: real-time stress analysis of Ge nanodot growth on Si(111)-77 surfaces, and preparation of the single-domained Si(110)-162 surface.
2" surfaceYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
Simple surface preparation method for the single-domain of Si(110)-162 utilizing the electromigration is proposed. It is found that the DC electric current along the surface reconstruction rows elongates the rpws. By means of the controlled electromigration, a micrometer-wide, single-domain of 162 surface can be successfully fabricated with nearly perfect reproducibility. The fabricated single-domain of Si(110) is not only useful for future basic researches on this surface, but also has high potential for application due to its strong one-dimensionality.
Glugla, M.*; Beloglazov, S.*; Carlson, B.*; Cho, S.*; Cristescu, I.*; Cristecu, I.*; Chung, H.*; Girard, J.-P.*; Hayashi, Takumi; Mardoch, D.*; et al.
no journal, ,
2 single domain surfaceYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
no abstracts in English
2 single-domainYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
no abstracts in English
2 surfaceYamada, Yoichi; Girard, A.*; Asaoka, Hidehito; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
no abstracts in English
Asahi, Yuichi; Hasegawa, Yuta; Padioleau, T.*; Millan, A.*; Bigot, J.*; Grandgirard, V.*; Obrejan, K.*
no journal, ,
Generally, production-ready scientific simulations consist of many different tasks including computations, communications and file I/O. Compared to the accelerated computations with GPUs, communications and file I/O would be slower which can be major bottlenecks. It is thus quite important to manage these tasks concurrently to suppress these costs. In the present talk, we employ the proposed language standard C++ senders/receivers to mask the costs of communications and file I/O. As a case study, we implement a 2D turbulence simulation code with the local ensemble transform Kalman filter (LETKF) using C++ senders/receivers. In LETKF, the mock observation data are read from files followed by MPI communications and dense matrix operations on GPUs. We demonstrate the performance portable implementation with this framework, while exploiting the performance gain with the introduced concurrency.
