Exciton binding energies in a dielectric quantum well in a magnetic field.
Exciton binding energies in a dielectric quantum well in a magnetic field.
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磁场中介电量子阱中的激子结合能。
DOI：
10.1103/physrevb.50.10947
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Bajaj
中科院分区：
文献类型：
--
作者：
Cen;Chen;Bajaj
我们研究了沿生长轴施加的磁场对介电量子阱结构中激子结合能的影响，其中限制势垒的介电常数明显小于阱材料的介电常数。通过求解量子阱层状几何结构中的泊松方程，解析得到各向异性电子-空穴库仑相互作用势。除了量子阱电势和施加的磁场之外，界面处介电常数不匹配产生的图像电荷分布也提供了限制。使用高斯型轨道展开法计算激子结合能。各种介电量子阱结构中的激子的结合能显着增强，并讨论了它们在磁场中的行为。
We study the effect of a magnetic field applied along the growth axis on exciton binding energies in dielectric quantum-well structures, in which the dielectric constant of the confining barriers is significantly smaller than that of the well material. The anisotropic electron-hole Coulomb interaction potential is obtained analytically by solving the Poisson equation in the layered geometry of quantum wells. Confinement is provided by the image charge distribution arising from the mismatch of dielectric constants at the interfaces, in addition to that of the quantum-well potential and the applied magnetic field. Exciton binding energies are calculated using the Gaussian-type orbital expansion method. Significantly enhanced binding energies are obtained for the excitons in various dielectric quantum-well structures and their behavior in a magnetic field is discussed.