在20mK的极低温下测量了石墨烯纳米带量子点的电子输运性质,观测到清晰的库仑阻塞菱形块和对应量子点激发态的电导峰.对库仑阻塞近邻电导峰间距和峰值进行了统计分析,发现其统计分布分别满足无规矩阵理论描述的Wigner-Dyson分布和Porter-Thomas分布,说明石墨烯纳米带量子点在低温下出现了量子混沌现象.还讨论了这种长方形量子点中量子混沌的可能成因. The electron transport properties of quantum dots of graphene nanoribbons were measured at a very low temperature of 20mK, and clear Coulomb block diamonds and the corresponding conduction peak of quantum dot excited state were observed. The results show that the statistical distribution of the quantum dots satisfies the Wigner-Dyson distribution and the Porter-Thomas distribution described by the random matrix theory respectively, which indicates that quantum chaos phenomenon occurs at low temperature in quantum dots of graphene nanoribbons. The possible causes of chaos.