Jarillo-Herrero P, Kong J, van der Zant H S J, Dekker C, Kouwenhoven L P, De Franceschi S
Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.
Phys Rev Lett. 2005 Apr 22;94(15):156802. doi: 10.1103/PhysRevLett.94.156802.
We report magnetic field spectroscopy measurements in carbon nanotube quantum dots exhibiting fourfold shell structure in the energy level spectrum. The magnetic field induces a large splitting between the two orbital states of each shell, demonstrating their opposite magnetic moment and determining transitions in the spin and orbital configuration of the quantum dot ground state. We use inelastic cotunneling spectroscopy to accurately resolve the spin and orbital contributions to the magnetic moment. A small coupling is found between orbitals with opposite magnetic moment leading to anticrossing behavior at zero field.
我们报告了在能级谱中呈现四重壳层结构的碳纳米管量子点中的磁场光谱测量结果。磁场在每个壳层的两个轨道态之间引起了很大的分裂，表明它们具有相反的磁矩，并确定了量子点基态自旋和轨道构型的跃迁。我们使用非弹性共隧穿光谱来精确分辨磁矩的自旋和轨道贡献。发现在具有相反磁矩的轨道之间存在小的耦合，导致在零场时出现反交叉行为。
