CAJ | 학술논문

在有效质量近似下,用变分法研究了闪锌矿GaN/Al_xGa_(1-x)N单量子点中的类氢杂质态.结果表明量子点中的杂质位置和量子点结构参数(量子点高度H、半径R及Al含量x)对施主束缚能有很大的影响.当杂质位于量子点中心时,施主束缚能E_b有最大值.此外,施主束缚能Eb随着量子点高度H(半径R)的增大而减小,随着量子点中Al含量x的增大而增大.
재유효질량근사하,용변분법연구료섬자광GaN/Al_xGa_(1-x)N단양자점중적류경잡질태.결과표명양자점중적잡질위치화양자점결구삼수(양자점고도H、반경R급Al함량x)대시주속박능유흔대적영향.당잡질위우양자점중심시,시주속박능E_b유최대치.차외,시주속박능Eb수착양자점고도H(반경R)적증대이감소,수착양자점중Al함량x적증대이증대.
Within the framework of the effective-mass approximation, hydrogenic impurity states confined in a cylindrical zinc-blende (ZB) GaN/Al_xGa_(1-x)N single quantum dot (QD) are investigated by means of a variational approach. Numerical results show that the donor binding energy is highly dependent on the impurity position and QD structural parameters (the QD height, radius and Al content x). When the impurity is located at the center of the quantum dot, the donor binding energy E_b is largest. Moreover E_b is decreased with the increasing of the QD height (and radius) and increased with the increasing of Al content x.