A Negative Donor Center Trapped by a Spherical Quantum Dot

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2008,（2）
• 页码范围: 507-510
• 页数: 4页
• 语种: 英文

摘要

The properties of the low-lying states of a negative donor center trapped by a spherical quantum dot, which is subjected to a parabolic potential confinement, are investigated in the absence of magnetic field. The calculations have been performed by means of the exact diagonalization of the Hamiltonian matrix within the effective-mass approximation. We find that there is only one bound state the D- center in a spherical parabolic quantum dot in the absence of magnetic field. The binding energy of the ground state is obtained as a function of the dot size. Moreover, the critical confined potential radius value at which the negative donor center changes from unbound to bound is obtained.