Room-temperature quantum interference in single perovskite quantum dot junctions

Zheng, Haining and Hou, Songjun and Xin, Chenguang and Wu, Qingqing and Jiang, Feng and Tan, Zhibing and Zhou, Xin and Lin, Luchun and He, Wenxiang and Li, Qingmin and Zheng, Jueting and Zhang, Longyi and Liu, Junyang and Yang, Yang and Shi, Jia and Zhang, Xiaodan and Zhao, Ying and Li, Yuelong and Lambert, Colin and Hong, Wenjing (2019) Room-temperature quantum interference in single perovskite quantum dot junctions. Nature Communications, 10: 5458. ISSN 2041-1723

Text (2019 - Nature Communications - Zheng et al. - Room-temperature quantum interference in single perovskite quantum dot junctions)
2019_Nature_Communications_Zheng_et_al._Room_temperature_quantum_interference_in_single_perovskite_quantum_dot_junctions.pdf - Published Version
Download (2MB)

Abstract

The studies of quantum interference effects through bulk perovskite materials at the Ångstrom scale still remain as a major challenge. Herein, we provide the observation of room-temperature quantum interference effects in metal halide perovskite quantum dots (QDs) using the mechanically controllable break junction technique. Single-QD conductance measurements reveal that there are multiple conductance peaks for the CH3NH3PbBr3 and CH3NH3PbBr2.15Cl0.85 QDs, whose displacement distributions match the lattice constant of QDs, suggesting that the gold electrodes slide through different lattice sites of the QD via Au-halogen coupling. We also observe a distinct conductance ‘jump’ at the end of the sliding process, which is further evidence that quantum interference effects dominate charge transport in these single-QD junctions. This conductance ‘jump’ is also confirmed by our theoretical calculations utilizing density functional theory combined with quantum transport theory. Our measurements and theory create a pathway to exploit quantum interference effects in quantum-controlled perovskite materials.