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J. Y. Sug,S. H. Lee,S. Y. Choi 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.10
We study the optical quantum transition line shapes and the optical quantum transitionlinewidths in relation to the magnetic-field-dependent properties of an electron-deformation potentialphonon interaction system. We consider two systems - one is subject to right circularlyoscillatingexternal fields and the other is subject to left circularly-oscillatory external fields. Weinvestigated theoretically the temperature dependence of the quantum optical transition of qusi-2-dimensional Landau splitting ystem in CdS, GaN and ZnO.
J. Y. Sug,S. H. Sohn,S. H. Lee,G. R. Shin,S. N. Yi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The optical quantum transition line shapes (QTLS), which show the absorption power and the quantum transition line widths (QTLW), in an electron-piezoelectric-phonon-interacting system were studied for two systems: one being in right - circularly - polarized oscilatory external fields and the other being in left - circularly - polarized oscilatory external field. In order to analyze the quantum transition proceses in circularly polarized oscilatory external fields, we investigated the temperature and the magnetic field dependences of the QTLW and the QTLS of CdS and compared the results for two transition proceses, the phonon emision transition proces and the phonon absorption transition proces. The results indicate that the absorption power of the right-circularly- polarized oscilatory external field is larger than that of the left circularly polarized oscilatory external field while the opposite results are obtained for the QTLW.
The thermal properties of the deformation potential materials in circularly oscillating fields
J. Y. Sug,S. H. Lee,S. C. Park,S. G. Geon,J. Y. Choi 장전수학회 2009 Advanced Studies in Contemporary Mathematics Vol.19 No.2
We study the thermal properties of electron-deformation potential phonon interacting system based on quantum transport theory. We use the projected Liouville equation method with Equilibrium Average Projection Scheme (EAPS). We consider two systems - the one system is under the right circularly polarized oscillatory external fields and the other system is under the left circularly polarized oscillatory external field. The main purpose of this work is that comparisons of QTLS which show the absorption power and QTLW in both directional circularly polarized oscillatory external field. Our results indicate that the absorption power of the right circularly polarized oscillatory external field is larger than that of the left circularly polarized oscillatory external field, while the opposite result is obtained for the QTLW. we analyze the temperature of the QTLS and the QTLW in various cases. In order to analysis the quantum transition process of two circularly oscillatory external field, we compare the temperature dependence of the QTLW and the QTLS of two transition process, the intra Landau level transition process and the inter Landau level transition process.
A STATISTICAL STUDY OF STREAMER-ASSOCIATED CORONAL MASS EJECTIONS
Moon, Y.J.,Kim, Jin-Sug,Kim, Y.H.,Cho, K.S.,Bong, Su-Chan,Park, Y.D. The Korean Astronomical Society 2006 Journal of The Korean Astronomical Society Vol.39 No.4
We have made a comprehensive statistical study on the coronal mass ejections(CMEs) associated with helmet streamers. A total number of 3810 CMEs observed by SOHO/LASCO coronagraph from 1996 to 2000 have been visually inspected. By comparing their LASCO images and running difference images, we picked out streamer-associated CMEs, which are classified into two sub-groups: Class-A events whose morphological shape seen in the LASCO running difference image is quite similar to that of the pre-existing streamer, and Class-B events whose ejections occurred in a part of the streamer. The former type of CME may be caused by the destabilization of the helmet streamer and the latter type of CME may be related to the eruption of a filament underlying the helmet streamer or narrow CMEs such as streamer puffs. We have examined the distributions of CME speed and acceleration for both classes as well as the correlation between their speed and acceleration. The major results from these investigations are as follows. First, about a quarter of all CMEs are streamer-associated CMEs. Second, their mean speed is 413 km $s^{-1}$ for Class-A events and 371 km $s^{-1}$ for Class-B events. And the fraction of the streamer-associated CMEs decreases with speed. Third, the speed-acceleration diagrams show that there are no correlations between two quantities for both classes and the accelerations are nearly symmetric with respect to zero acceleration line. Fourth, their mean angular width are about $60^{\circ}$, which is similar to that of normal CMEs. Fifth, the fraction of streamer-associated CMEs during the solar minimum is a little larger than that during the solar maximum. Our results show that the kinematic characteristics of streamer-associated CMEs, especially Class-A events, are quite similar to those of quiescent filament-associated CMEs.
The Quantum Optical Transition Properties of ZnO in an Infinite Square Well Potential System
S.H. Lee,J.Y. Choi,J.H. Park,J.Y. Sug,S.T. Bae,김진규 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
Based on quantum transport theory, investigate theoretically the quantum cyclotron resonance transition properties of ZnO in a quasi-2-dimensional Landau splitting system. We apply the quantum transport theory to the system with the electrons confined by a square well potential. We investigate the optical quantum transition line shapes of ZnO relating with the absorption power and the quantum transition line widths of ZnO relating with the scattering effect in the electron-piezoelectric phonon interacting system under circularly-polarized oscillatory external fields. The half-widths, γ(T)total of ZnO for an external field with a wavelength of 295 μm increase as the temperature increases. The half-widths, γ(B)total , increase with the magnetic field at all temperatures for low magnetic fields of less than B=12 T, but it decrease with the magnetic field at high magnetic fields larger than B=12 T for all temperatures.
S. H. Lee,권성열,J. G. Kim,J. Y. Choi,J. Y. Sug 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
Abstract-We investigated theoretically the temperature dependence of the quantum optical transition of quasi-2-dimensional Landau splitting, in GaN and GaAs. We apply the quantum transport theory (QTR) to a system of electrons confined in a potential. We use the projected Liouville equation method with equilibrium average projection scheme (EAPS). Through the analysis of this work, we found increasing optical quantum transition line shapes (QTLSs) and the quantum transition line widths (QTLWs) in GaN and GaAs with increasing temperature. We also found the temperature dependences of the scattering factor functions: γ(T) of GaN < γ(T) of GaAs in the temperature region 50 K < T and γ(T) of GaAs < γ(T) of GaN in the temperature T < 50 K and λ = 394 µm.
이수호,J. Y. Sug,T. G. Kang 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
We study optical quantum transition line shapes (QTRSs) and optical quantum transition line widths (QTLWs) in relation to magnetic-field dependence properties of the electron- deformation potential phonon interaction system. We consider two systems - one is subject to right circularly oscillating external fields and the other is subject to left circularly oscillatory external fields. The main purpose of this work is to compare QTLSs, which indicate absorption power, in the two oscillating external fields. Our results indicate that the QTLSs of right circularly oscillating external fields is larger than the QTLSs of left circularly oscillating external fields, while the opposite result is obtained for the QTLWs. Through the analysis of this work , we found the increasing properties of QTLW and QTLS of ZnS and Ge with the temperature and the magnetic fields. We also found the dominant scattering processes are the phonon emission transition process.
S. H. Lee,J. Y. Sug,J. H. Lee,J. T. Lee 한국자기학회 2011 Journal of Magnetics Vol.16 No.4
We investigated theoretically the magnetic field dependence of the quantum optical transition of qusi 2-Dimensional Landau splitting system, in GaN and ZnO. We apply the Quantum Transport theory (QTR) to the system in the confinement of electrons by square well confinement potential. We use the projected Liouville equation method with Equilibrium Average Projection Scheme (EAPS). Through the analysis of this work , we found the increasing properties of the optical Quantum Transition Line Shapes(QTLSs) which show the absorption power and the Quantum Transition Line Widths(QTLWs) with the magnetic-field in GaN and ZnO. We also found that QTLW, γ (B)total of GaN <γ(B)total of ZnO in the magnetic field region B < 25 Tesla.