Kondo effect in a quantum wire with spin-orbit coupling
Autor: | G. R. de Sousa, Edson Vernek, Joelson F. Silva |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
FOS: Physical sciences
02 engineering and technology 01 natural sciences symbols.namesake Condensed Matter - Strongly Correlated Electrons Impurity Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Anderson impurity model Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Quantum wire Spin–orbit interaction Renormalization group 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect symbols Condensed Matter::Strongly Correlated Electrons Kondo effect 0210 nano-technology Hamiltonian (quantum mechanics) Fermi gas |
Popis: | The influence of spin-orbit interactions on the Kondo effect has been under debate recently. Studies conducted recently on a system composed by an Anderson impurity on a 2DEG with Rashba spin-orbit have been shown that it can enhance or suppress the Kondo temperature ($T_{\rm K}$), depending on the relative energy level position of the impurity with respect to the particle-hole symmetric point. Here we investigate a system composed by a single Anderson impurity side-coupled to a quantum wire with spin-orbit coupling (SOC). We derive an effective Hamiltonian in which the Kondo coupling is modified by the SOC. In addition, the Hamiltonian contains two other scattering terms, the so called Dzaloshinskyi-Moriya interaction, know to appear in these systems, and a new one describing processes similar to the Elliott-Yafet scattering mechanisms. By performing a renormalization group analysis on the effective Hamiltonian, we find that the correction on the Kondo coupling due to the SOC favors and enhancement of the Kondo temperature even in the particle-hole symmetric point of the Anderson model, agreeing with the NRG results. Moreover, away from the particle-hole symmetric point, $T_{\rm K}$ always increases with the SOC, accordingly with the previous renormalization group analysis. 9 pages, 3 figures |
Databáze: | OpenAIRE |
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