For quantum ballistic transport of electrons through a short conduction channel, the role of Coulomb interaction may significantly modify the energy levels of an electron pair at low temperatures as the channel becomes wide. In this regime, the Coulomb effect on the orbital triplet and singlet electron-pair state is calculated and found to lead to four split energy levels, including two hybrid and two unhybrid states. Moreover, due to the interplay of hybrid and unhybrid Coulomb interactions between two electrons, our calculations reveal that the ground pair-state will switch from one hybrid orbit-triplet state (strong confinement) to the unhybrid orbit-singlet state (intermediate confinement) as the channel width gradually increases and then back to the original hybrid orbit-triplet state (weak confinement), due to larger total spin of the orbit-singlet state, as the channel width becomes larger than a threshold value. This switching behavior leaves a footprint in the conductance as well as in the diffusion thermoelectric power of electrons. Here, the predicted reoccurrence of the hybrid orbit-triplet state (spin-$0$ state) as a ground state is shown to relate to the higher spin degeneracy of the spin-$1$ state as well as to the strong Coulomb repulsion in the central region of the channel, which separates two electrons away and pushes them to different channel edges. The conductance reoccurrence region expands from the weak to the intermediate confinement regime with increasing linear electron density.
Spin noise of localized electrons in CdTe/CdMgTe quantum well
Ioffe Institute（约费研究所）；Laboratoire Charles Coulomb, UMR 5221 CNRS/Université de Montpellier（查尔斯·库隆实验室，CNRS/蒙彼利埃大学）；Université Grenoble Alpes, CNRS, Institut Néel（格勒诺布尔阿尔卑斯大学，CNRS，尼尔研究所）
Interplay of ferroelectricity and interlayer superconductivity in van der Waals bilayers
L. D. Landau Institute for Theoretical Physics（列夫·朗道理论物理研究所）；Moscow Institute of Physics and Technology (National Research University)（莫斯科物理技术学院（国立研究大学））；National University of Science and Technology “MISIS”（国立科技大学“MISIS”）；Institute for Physics of Microstructures, Russian Academy of Sciences（俄罗斯科学院微观结构物理研究所）
