Year: 2025
Type: article
Abstract: Electrons in closed quantum systems can exhibit Coulomb blockade (CB) oscillations due to charge quantization. Here, we report CB oscillations in aluminum superconducting islands on InAs nanowires in the open regime. The Al island is connected to source/drain leads through two contacts: One is fully transmitting while the other is tuned into the tunneling regime. This device configuration is typical for tunneling spectroscopy where the charging energy is generally considered negligible. The oscillation periods are $2e$ or $1e$, depending on the gate settings. A magnetic field can also induce the $2e$ to $1e$ transition. Our result is reminiscent of the ``mesoscopic Coulomb blockade'' in open quantum dots caused by electron interference.
Authors: Huading Song, Zhaoyu Wang, Dong Pan, Jiaye Xu, Yuqing Wang, Zhan Cao, Dong E. Liu, Ke He, Runan Shang, Jianhua Zhao, Hao Zhang
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4410191737