Zero-energy modes in serially coupled double quantum dots

• 来源期刊: 中国物理B（英文版）
• 关键词: zero-energy mode quantum dot temperature
• 年，卷（期）: 2020,（6）
• 页码范围: 505-510
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab8378

摘要

We investigate symmetrically coupled double quantum dots via the hierarchical equations of motion method and propose a novel zero-energy mode (ZEM) at a temperature above the spin singlet–triplet transition temperature. Owing to the resonance of electron quasi-particle and hole quasi-particle, ZEM has a peak atω=0 in the spectral density function. We further examine the effect of the magnetic field on the ZEM, where an entanglement of spin and charge has been determined;therefore, the magnetic field can split the ZEM in the spectra.