Stable Unpaired Electron States in the Lu–Lu Bond Leading to the Absence of Odd–Even Parity in the Kondo Effect of Lu <sub>2</sub> @C <sub>82</sub> Transistors

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<sub>2</sub>@C<sub>82</sub> 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<sub>60</sub>. Density functional theory calculations revealed that upon electron loss, a spin-1/2 electron predominantly from the <i>s</i>-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<sub>2</sub>@C<sub>82</sub> held stable unpaired electron states across multiple charge states and has potential applications in spin quantum devices.

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Publication Details

Journal
Nano Letters
Published
2025-03-27
DOI
https://doi.org/10.1021/acs.nanolett.5c00365
Citations
5
Primary Topic
Diamond and Carbon-based Materials Research
Type
article
Field-Weighted Citation Impact
2.59

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article

Stable Unpaired Electron States in the Lu–Lu Bond Leading to the Absence of Odd–Even Parity in the Kondo Effect of Lu 2 @C 82 Transistors

Minhao Zhang, Jun Chen, Lipiao Bao, Yifu Mao et al.
5 citations
Nano Letters
Diamond and Carbon-based Materials Research
2.59
article

Stable Unpaired Electron States in the Lu–Lu Bond Leading to the Absence of Odd–Even Parity in the Kondo Effect of Lu 2 @C 82 Transistors

Minhao Zhang, Jun Chen, Lipiao Bao, Yifu Mao, Wangqiang Shen, Fengqi Song, Fucong Fei, Tao Yang, Xing Qiang Lü, Yu Du, Yuyuan Qin, Feng Wang, Wan Jianguo, Yuan Shui, Haoran Qi, Xinrong Liu
article en
5 citations

Abstract

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<sub>2</sub>@C<sub>82</sub> 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<sub>60</sub>. Density functional theory calculations revealed that upon electron loss, a spin-1/2 electron predominantly from the <i>s</i>-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<sub>2</sub>@C<sub>82</sub> held stable unpaired electron states across multiple charge states and has potential applications in spin quantum devices.

Nano LettersVol. 25(14)
Hefei University of Technology (CN), Equilibrium Research (GB), Division of Materials Science and Engineering (AU), Collaborative Innovation Center of Advanced Microstructures (CN), Materials Processing (United States) (US), Huazhong University of Science and Technology (CN), Xi'an Jiaotong University (CN), Nanjing University (CN)
National Natural Science Foundation of China, Natural Science Foundation of Jiangsu Province
Openalex Percentile: Top 11%
Diamond and Carbon-based Materials Research
2.59
DOIOpen Access PDFOpenAlex
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