tailieunhanh - Absorption power and linewidths in quantum wells with Poschl-Teller hyperbolic potential in magnetic fields

In this paper, the author consider an nonsquare QW structure whose potential profile is described by a modified hyperbolic shape quantum well with Posch - Teller type. The author consider the MPR effect, clarify the nature of the optically detected MPR (ODMPR) effect. | ABSORPTION POWER AND LINEWIDTHS IN QUANTUM WELLS ¨ WITH POSCHL-TELLER HYPERBOLIC POTENTIAL IN MAGNETIC FIELDS LE DINH 1 TRAN THI THU PHAM TUAN VINH 2 1 Hue University of Education, University of Hue 2 Dong Thap University NGUYET1 , Abstract: Explicit expressions for magnetoconductivity and absorption power in hyperbolic quantum well with P¨oschl-Teller potential type under the influence of a static magnetic fielf was obtained using the state-independent operator projection technique. The dependence of absorption power on photon energy was calculated and graphically plotted. From the graph of absorption power as a function of photon energy, we investigated the optically detected magneto-phonon resonance effect and the spectral linewidths of the resonance peaks. The obtained results show that the appearance of resonance peaks satisfies the law of conservation of energy, and the spectral linewidths of the resonant peaks vary with temperature, magnetic field intensity, and well parameters. Keywords: absorption power, quantum well, hyperbolic, P¨oschl-Teller potential, ODMPR, linewidths 1 INTRODUCTION In recent years, studies on low-dimensional semiconductor physics have not stopped growing and obtained considerable achievements. Scientists have found many new effects in low-dimensional semiconductors with different types of confined potentials, such as electron - phonon resonance (EPR), magnetophonon resonance (MPR), cyclotron resonance (CR) [1, 2, 3, 4, 5]. However, most of these work considering the wells with the square or parabolic confined potentials. Recent technology in molecular-beam epitaxy growth techniques have enabled us to create potential profiles with various reasonable nonsquare shapes [6]. The properties of these nonsquare quantum wells (QWs) are specially focused due to their various applications in fabricating new optoelectronic devices. Journal of Sciences and Education, Hue Universitys College of Education ISSN 1859-1612, No 01(45)/2018: pp. .