Chen Jun, Shui Yuan, Shen Wangqiang, Wang Feng, Mao Yifu, Qi Haoran, Liu Xinrong, Du Yu, Fei Fucong, Qin Yuyuan, Wan Jianguo, Bao Lipiao, Zhang Minhao, Yang Tao, Lu Xing, Song Fengqi
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
Institute of Atom Manufacturing, Nanjing University, Suzhou 215163, China.
Nano Lett. 2025 Apr 9;25(14):5762-5769. doi: 10.1021/acs.nanolett.5c00365. Epub 2025 Mar 27.
Spin qubits constructed in endohedral fullerenes benefit from the protective shielding of the carbon cage, which effectively mitigates external decoherence and enables ultralong coherence times. However, endohedral fullerene spin qubits face the challenge of charge transfer in complex electrical environments, such as during qubit readout or large-scale integration, which can induce spin state modifications. In this study, we developed transistors based on the endohedral fullerene Lu@C and observed the absence of parity dependence in the Kondo effect; this result was contradictory to the typical behavior of the Kondo effect observed in C. Density functional theory calculations revealed that upon electron loss, a spin-1/2 electron predominantly from the -orbitals formed in the Lu-Lu bond and its orbital energy was significantly lower than that of the highest occupied molecular orbital. Based on these results, Lu@C held stable unpaired electron states across multiple charge states and has potential applications in spin quantum devices.
内嵌富勒烯中构建的自旋量子比特受益于碳笼的保护屏蔽，这有效地减轻了外部退相干并实现了超长的相干时间。然而，内嵌富勒烯自旋量子比特面临着复杂电环境中电荷转移的挑战，例如在量子比特读出或大规模集成期间，这可能会引起自旋态的改变。在本研究中，我们开发了基于内嵌富勒烯Lu@C的晶体管，并观察到近藤效应中不存在宇称依赖性；这一结果与在C中观察到的近藤效应的典型行为相矛盾。密度泛函理论计算表明，在电子损失时，一个主要来自Lu-Lu键中形成的 -轨道的自旋1/2电子，其轨道能量明显低于最高占据分子轨道的能量。基于这些结果，Lu@C在多个电荷态下保持稳定的未配对电子态，并在自旋量子器件中具有潜在应用。
