Statistical significance of conductance quantization

Article

关键词: SIZED POINT-CONTACT;    DISORDERED CONDUCTORS;    MECHANICAL-PROPERTIES;    MACROSCOPIC APPROACH;    BALLISTIC TRANSPORT;    WEAK-LOCALIZATION;    QUANTUM TRANSPORT;    METALLIC CONTACTS;    FLUCTUATIONS;    NANOSTRUCTURES;   

DOI  :  10.1103/PhysRevB.57.2541

来源: SCIE

【 摘 要 】

Recent experiments on atomic-scale metallic contacts have shown that the quantization of the conductance appears clearly only after the average of the experimental results. Motivated by these results we have analyzed a simplified model system in which a narrow neck is randomly coupled to wide ideal leads, both in absence and presence of time reversal invariance. Based on random matrix theory we study analytically the probability distribution for the conductance of such system. As the width of the leads increases the distribution becomes sharply peaked close to an integer multiple of the quantum of conductance. Our results suggest a possible statistical origin of conductance quantization in atomic-scale metallic contacts. [S0163-1829(98)04604-9].

【 授权许可】

Free