Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase

Couplings between topological edge channels open electronic phases possessing nontrivial eigenmodes far beyond the noninteracting-edge picture. However, inelastic scatterings mask the eigenmodes’ inherent features, often preventing us from identifying the phases, as is the case for the quintessentia...

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Published inPhysical review. X Vol. 13; no. 3; p. 031024
Main Authors Hashisaka, Masayuki, Ito, Takuya, Akiho, Takafumi, Sasaki, Satoshi, Kumada, Norio, Shibata, Naokazu, Muraki, Koji
Format Journal Article
LanguageEnglish
Published American Physical Society 07.09.2023
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Abstract Couplings between topological edge channels open electronic phases possessing nontrivial eigenmodes far beyond the noninteracting-edge picture. However, inelastic scatterings mask the eigenmodes’ inherent features, often preventing us from identifying the phases, as is the case for the quintessential Landau-level filling factor ν=2/3 edge composed of the counterpropagating ν=1/3 and 1 (1/3–1) channels. Here, we study the coherent-incoherent crossover of the 1/3–1 channels by tuning the channel length in situ using a new device architecture comprising a junction of ν=1/3 and 1 systems, the particle-hole conjugate of the 2/3 edge. We successfully observed the concurrence of the fluctuating electrical conductance and the quantized thermal conductance in the crossover regime, the definitive hallmark of the eigenmodes in the disorder-dominated edge phase left experimentally unverified.
AbstractList Couplings between topological edge channels open electronic phases possessing nontrivial eigenmodes far beyond the noninteracting-edge picture. However, inelastic scatterings mask the eigenmodes’ inherent features, often preventing us from identifying the phases, as is the case for the quintessential Landau-level filling factor ν=2/3 edge composed of the counterpropagating ν=1/3 and 1 (1/3–1) channels. Here, we study the coherent-incoherent crossover of the 1/3–1 channels by tuning the channel length in situ using a new device architecture comprising a junction of ν=1/3 and 1 systems, the particle-hole conjugate of the 2/3 edge. We successfully observed the concurrence of the fluctuating electrical conductance and the quantized thermal conductance in the crossover regime, the definitive hallmark of the eigenmodes in the disorder-dominated edge phase left experimentally unverified.
ArticleNumber 031024
Author Ito, Takuya
Muraki, Koji
Sasaki, Satoshi
Kumada, Norio
Shibata, Naokazu
Akiho, Takafumi
Hashisaka, Masayuki
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  fullname: Muraki, Koji
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Title Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase
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