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RISS 인기검색어
- 검색키워드
- 저자 : Vomir, M. (검색결과 2 건)
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Quasi-Static Strain Effect on Ultrafast Magnetization Dynamics
Yooleemi Shin,Mircea Vomir,Dong-Hyun Kim,Phuoc Cao Van,Jong-Ryul Jeong,Ji-Wan Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The thermal lattice expansion by photo-excitation generates two types of strain, which are the well-known propagating strain pulse and the quasi-static strain (QSS) induced from long-lived thermal expansion of lattice within the penetration depth. The QSS has not been regarded despite its comparable amplitude to that of the propagating one. As one of principal reasons, we consider that QSS and thermal energy are inextricable in photo-induced experiments, therefore QSS effect, which is not familiar, might have been misled to be a temperature effect. The three-temperatures model, that we have used so far without a doubt, does not contain the information of strains that exist as long as thermal expansion does, but only consider the thermal effect, that is temperature profiles of sub-systems. This fact does not provide proper analyses and might hinder unveiling new physics in ultrafast phenomena. Here, we prove the existence of QSS using time-resolved magneto-optical Kerr effect and time-resolved Sagnac interferometer and demonstrate that QSS effect prevails over thermal effect in Co(25 nm)/sapphire and Ni (270 nm)/sapphire leading to the increase of spin precession frequency with the increase of the pump intensity. The intensity dependence of spin precession of two magneto strictive materials are shown in Fig. 1(a) and 1(b), respectively.
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Exciton diffusion in near-infrared absorbing solution-processed organic thin films
Shin, H.-Y.,Woo, J. H.,Gwon, M. J.,Barthelemy, M.,Vomir, M.,Muto, T.,Takaishi, K.,Uchiyama, M.,Hashizume, D.,Aoyama, T.,Kim, D.-W.,Yoon, S.,Bigot, J.-Y.,Wu, J. W.,Ribierre, J. C. The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.8
<P>We report on singlet–singlet annihilation and exciton diffusion in as-prepared p-type and annealed n-type thin films of the low-bandgap quinoidal quaterthiophene [QQT(CN)4] using ultrafast transient absorption measurements. The decay dynamics of exciton populations are well described by a one-dimensional diffusion-limited bimolecular recombination, indicating that the singlet excitons migrate preferentially along the stacking direction. Our results show that the exciton diffusion constants in QQT(CN)4 films do not vary significantly upon thermal annealing. Exciton diffusion lengths are measured to be as high as 4 and 5 nm in as-prepared and annealed QQT(CN)4 films, respectively. We also observe an influence of the excitation densities on the singlet exciton diffusion, which is attributed to phonon scattering. Because of the possibility of patterning p–n regions in QQT(CN)4 films by thermal nanolithography techniques, this study provides important insight not only into the photophysical properties of quinoidal oligothiophene derivatives but also for their future integration into high-performance p–n nanostructured near infrared light-sensing devices.</P> <P>Graphic Abstract</P><P>Exciton–exciton annihilation and exciton diffusion processes are investigated by femtosecond transient absorption in as-prepared p-type and annealed n-type thin films of the quinoidal quaterthiophene [QQT(CN)4]. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43705h'> </P>
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