Quantum Phase Transition in Capacitively Coupled Double Quantum Dots

2005/05/11 by Martin R. Galpin, David E. Logan, H. R. Krishnamurthy · 6 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.94.186406

published as Phys. Rev. Lett. 94, 186406 (2005) · 4 pages, 3 figures

openalex publication_date 2005/05/11 · arxiv created 2005/05/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate two equivalent, capacitively coupled semiconducting quantum dots, each coupled to its own lead, in a regime where there are two electrons on the double dot. With increasing interdot coupling, a rich range of behavior is uncovered: first a crossover from spin- to charge-Kondo physics, via an intermediate SU(4) state with entangled spin and charge degrees of freedom, followed by a quantum phase transition of Kosterlitz-Thouless type to a non-Fermi-liquid "charge-ordered" phase with finite residual entropy and anomalous transport properties. Physical arguments and numerical renormalization group methods are employed to obtain a detailed understanding of the problem.

Citations

• The renormalization group: Critical phenomena and the Kondo problem

Cited by

• Zero-Bias Conductance in Carbon Nanotube Quantum Dots
• Three-Orbital Kondo Effect in Single Quantum Dot System with Plural Electrons
• Kondo physics and dissipation: A numerical renormalization-group approach to Bose-Fermi Kondo models
• Minimal realization of the orbital Kondo effect in a quantum dot with two leads
• Transport through a quantum dot with SU(4) Kondo entanglement
• Gate voltage effects in capacitively coupled quantum dots

Related

• A New Quantum Phase Transition in the Coupled Quantum Dots System
• Coulomb blockade and non-Fermi-liquid behavior in quantum dots
• Charge Fluctuations in a Quantum Dot with a Dissipative Environment
• Quantum phase transition of Ising-coupled Kondo impurities
• From spin and orbital SU(4) to spin SU(2) Kondo effect in double quantum dot