標題: | Magnetization and magnetic susceptibility of InAs nano-rings |
作者: | Voskoboynikov, O Lee, CP 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | nano-rings;magnetization;magnetic susceptibility |
公開日期: | 1-一月-2004 |
摘要: | In this work, we investigate theoretically the magnetic susceptibility of the three-dimensional cut-torus-shaped quantum rings. The calculations are carried out for the realistic three-dimensional model of InAs/GaAs nano-rings with the hard-wall confinement potential, three-dimensional effective one-electronic-band Hamiltonian with position and energy-dependent effective mass, and Ben Daniel-Duke boundary conditions. This allows us to describe the penetration of the magnetic field into the torus region. At zero temperature, the ring's differential susceptibility demonstrates delta-like paramagnetic peaks, which are generated by aperiodic oscillations of magnetization. With increasing temperature, the peaks gradually transform into Lorenz-shaped peaks and then disappear. As opposed to meso-scopic quantum rings we found a dependence of the peak's amplitude on the dimensions of the rings. (C) 2003 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.physe.2003.08.018 http://hdl.handle.net/11536/27229 |
ISSN: | 1386-9477 |
DOI: | 10.1016/j.physe.2003.08.018 |
期刊: | PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES |
Volume: | 20 |
Issue: | 3-4 |
起始頁: | 278 |
結束頁: | 281 |
顯示於類別: | 會議論文 |