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      • KCI등재

        Optically Detected Spin-Magnetophonon Resonances in Semiconductors

        이상칠,김석환,Jeong Woo Kang,강남룡 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3

        We investigate the influence of the effective g-factor from optically detected spin-magnetophonon resonance (ODSMPR) phenomena, including the Zeeman spin Hamiltonian term, in bulk polar semiconductors in magnetic fields. The conditions for the appearance of the ODSMPR line shape near the main peaks due to the resonant scattering of photons as functions of the magnetic field strength and the incident photon frequency applied to the bulk semiconductor are obtained. We also obtain the magnetoconductivity from the ODSMPR phenomena, including the Zeeman splitting. Furthermore, we suggest the possibility of finding the effective g-factor from the spin-magnetophonon resonance (SMPR) conditions.

      • KCI등재

        자기장하의 GaAs/Al$_x$Ga$_{1-x}$As 반도체초격자내 다중양자우물내 플라스몬속성의 이론적 조사

        이상칠,안형수,김석환 한국물리학회 2017 New Physics: Sae Mulli Vol.67 No.2

        Extending a previous theoretical framework for the multiple-quantum-well (MQW) system in the GaAs/Al$_x$Ga$_{1-x}$As semiconductor superlattice, we obtained, on the basis of a simple model of a half-parabolic confining potential varying with the composition of the Al$_x$Ga$_{1-x}$As barrier layer, the density-density correlation function, including intrasubband and intersubband transitions, by using the random-phase approximationin under a magnetic field perpendicular to the axis of the superlattice. The dispersion energies for the surface and the bulk states were obtained as a function of compositional ratio of $x$ in the Al$_x$Ga$_{1-x}$As barrier layer and the magnetic field strength, respectively. The Raman intensities due to the bulk and the surface were also obtained for incoming light energy as a function of the compositional ratio $x$ and the magnetic field strength. GaAs/Al$_x$Ga$_{1-x}$As 반도체초격자내 다중양자우물계에 대한 이전의 이론적 토대를 확장하여 초격자축에 수직한 자기장하의 막 위상 근사방법을 사용하고 부 밴드 내와 부 밴드 사이의 전이가 포함된 밀도-밀도 상관 함수가 반-포물선형 구속 퍼텐셜을 기초로 얻어 졌다. 표면과 벌크 상태들에 대한 분산에너지를 Al$_x$Ga$_{1-x}$As 장벽층의 조성비와 자기장세기의 함수로 각각 얻었다. 또한 표면과 벌크 상태들에 대한 라만 세기를 조성비와 자기장세기의 함수로 얻는다.

      • KCI등재

        섭동 전기장하의 n-Ge/SiO2 초격자내 플라즈몬의 집단여기 현상

        이상칠,안형수,김석환 한국물리학회 2015 New Physics: Sae Mulli 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.

      • KCI등재

        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.

      • KCI등재

        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.

      • KCI등재

        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.

      • KCI등재

        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.

      • KCI등재

        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.

      • KCI등재

        Angular Dependence of the Heat Capacity in a Quantum-dot Superlattice with the Zeeman Effect in Tilted Magnetic Fields

        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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