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Optically Detected Spin-Magnetophonon Resonances in Semiconductor Superlattices
이상칠 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
The influence of the effective $g$-factor from optically detected spin-magnetophonon resonance (ODSMPR) phenomena is investigated, including the Zeeman spin Hamiltonian term, in a short-period InAs-based polar semiconductor superlattice in magnetic fields. The conditions for the appearance of the ODSMPR line shape for various miniband widths as functions of the magnetic field strength and the incident photon frequency applied to the short-period InAs-based polar semiconductor superlattice are obtained. We also suggest the possibility of finding the effective $g$-factor value from the spin-magnetophonon resonance (SMPR) conditions.
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Optically Detected Magnetophonon Resonances in Quantum Wells
이상칠 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
We investigate optically detected magnetophonon resonance (ODMPR) effects for the Faraday configuration in quantum wells of $n$-GaAs materials with square and parabolic confining potentials. We also obtain the ODMPR conditions for the Faraday configurations as functions of the well-width in the square well and the confinement frequency in the parabolic well for various photon frequencies. In particular, the anomalous behaviors of the ODMPR lineshape, such as the splitting of the ODMPR peaks for an incident photon frequency, as a function of the magnetic field strength are discussed. Furthermore, we obtain the shift properties of the main peaks by using selection rules that depend on the Faraday configuration in quantum wells with two kinds of potential.
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Magnetization and Magnetic Susceptibility in a Quantum-dot Superlattice at Low Temperature
이상칠,김석환 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
At low temperature, the magnetization and the magnetic susceptibility of the electronic system in quantum-dot superlattices (QDSL’s) of GaAs, InAs, and InSb, respectively, with an isotropic parabolic potential under a magnetic field are investigated on the basis of canonical ensemble statistics including the Zeeman effect. The dependences of the magnetization and the magnetic susceptibility on the confinement frequency of the isotropic parabolic potential and the electronic density in the QDSL’s of GaAs, InSb, and InAs, respectively, are studied numerically at low temperature. Furthermore, the dependences of the peak shifts of the magnetization and the magnetic susceptibility on the effective g-factor value in QDSL’s of GaAs, InSb, and InAs, respectively, at low temperature are obtained numerically.
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이상칠,안형수,Suck Whan Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.5
Extending our previous theoretical framework, we study the heat capacity of a canonical ensemble,including the Zeeman effect, under an incident magnetic field at a specific angle with respect to theaxis of the quantum-dot superlattices (QDSL’s) and confined by an isotropic parabolic potentialfor GaAs, InAs, and InSb, respectively. Furthermore, we numerically obtain the dependences ofthe heat capacity on the angle between the incident magnetic field’s direction and the superlatticeaxis for an isotropic, confining, parabolic potential as functions of the temperature, the effectiveg-factor value, and the confinement frequency in the QDSL’s of GaAs, InSb, and InAs, respectively. Particularly, the dependence of the heat capacity on the angle of the incident magnetic field isdiscussed in detail.
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Heat Capacity in a Quantum-dot Superlattice with the Zeeman Effect
이상칠,김석환 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
We investigate the heat capacity using the previous theoretical framework for the electronic system in the quantum-dot superlattices (QDSL’s), including the Zeeman effect of GaAs, InAs, and InSb, respectively, by using an isotropic parabolic potential under a magnetic field on the basis of canonical ensemble statistics. We numerically study the dependences of the heat capacity on the confinement frequency of the isotropic parabolic potential and the electronic density as functions of the temperature and the magnetic field strength in the QDSL’s of GaAs, InSb, and InAs, respectively. Furthermore, we numerically obtain the dependences of the heat capacity on the effective g-factor value in the QDSL’s of GaAs, InSb, and InAs, respectively, as functions of the temperature and the magnetic field strength.
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섭동 전기장하의 n-Ge/SiO2 초격자내 플라즈몬의 집단여기 현상
이상칠,안형수,김석환 한국물리학회 2015 새물리 Vol.65 No.3
In this paper, the density-density correlation function for an n-Ge/SiO2 type-I superlattice with an infinite confining potential well and surfaces of different dielectric media under a perturbing electric field parallel to the superlattice axis is calculated. This includes intrasubband and intersubband transitions in a multiple quantum well (MQW) consisting of n-Ge quantum wells separated by a SiO2 barrier, and the random-phase approximation is used. We also obtain the dispersion relations for the bulk and the surface subband states as functions of the electric field strength averaged over the quantum well and the momentum wavevector, respectively. Furthermore, we obtain the Raman intensities due to the bulk and the surface states of the intrasubband and the intersubband states as a function of the energy of the incident light. 초격자축에 평행한 섭동 전기장 하의 서로 다른 유전 매체를 가진 표면과 무한 사각형 구속 퍼텐셜 우물을 가진 제1종 n-Ge/SiO2 초격자에 대한 밀도-밀도 상관함수가 막 위상근사 방법 (random phase approximation, RPA)을 사용하여 SiO2 장벽에 의해 분리된 n-형 Ge 양자우물의 다중계로 구성된 다중양자우물 내의 띠 내 버금 띠 (intrasubband)와 띠 간 버금 띠 (intersubband) 사이의 전이를 포함하여 계산 하였다. 우리는 덩어리 (bulk)와 표면 버금 띠 (subband) 상태의 분산 관계를 파수벡터와 전체 양자우물의 평균 전기장의 함수로 각각 얻었다. 나아가 입사광 에너지의 함수로서 띠 내 버금 띠와 띠 간 버금 띠 상태의 표면 버금 띠와 벌크 버금 띠 상태에 기인한 라만 세기를 얻었다.
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Electrophonon Resonance in Quantum-Dot Superlattices
이상칠 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
Electrophonon resonance (EPR) effects in quantum-dot superlattices of n-GaAs polar semiconductors with an anisotropic parabolic potential well are investigated. The EPR conditions as functions of the confinement frequencies in a parabolic potential well are also studied. In particular, anomalous behaviors of the EPR lineshapes, such as the EPR peaks for the confinement frequencies and the miniband widths, are discussed. Furthermore, the energy ranges for the plateau region between neighboring EPR peaks due to the electron transitions by the optical phonons are obtained. Electrophonon resonance (EPR) effects in quantum-dot superlattices of n-GaAs polar semiconductors with an anisotropic parabolic potential well are investigated. The EPR conditions as functions of the confinement frequencies in a parabolic potential well are also studied. In particular, anomalous behaviors of the EPR lineshapes, such as the EPR peaks for the confinement frequencies and the miniband widths, are discussed. Furthermore, the energy ranges for the plateau region between neighboring EPR peaks due to the electron transitions by the optical phonons are obtained.
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