Phase diagram characterized by transmission in a triangular quantum dot

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum dots quantum phase transition Kondo effect transmission
• 年，卷（期）: 2018,（11）
• 页码范围: 575-580
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/11/117303

摘要

We propose a theoretical model to detect the quantum phase transition in a triangular quantum dot molecule with frustration.The boundaries of the phase diagram are accurately determined by the transmission.For small frustration t,as the interdot Coulomb repulsion V increases,the system undergoes a Kosterlitz-Thouless (KT) transition from the Kondo resonance state with a transmission peak at zero energy to the Coulomb blocked state with zero transmission,which is followed by a first transition to the V-induced resonance (VIR) state with unitary transmission.For large frustration t,as V increases,the orbital spin singlet without transmission transits to the VIR state through a KT transition.