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2012 | 122 | 4 | 741-747
Article title

Quasi-Particle Localization by Disorder in ν = 5/2 Fractional Quantum Hall State and Its Potential Application

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EN
Abstracts
EN
We consider the filling factor 5/2 fractional quantum Hall state of spin-polarized fermions in a dirty (mobility μ_b < 10 m^2 V^{-1} s^{-1}) bi-layer quantum well system.We show that the system undergoes a quantum phase transition from the effective two-component state to an effective single-component state, at fixed charge imbalance regulatory parameter Δ_{c} and constant layer separation, as the inter-layer tunneling strength Δ_{SAS} is increased. At finite and constant Δ_{SAS}, a transition from the latter state to the former state is also possible upon increasing the parameter Δ_{c}. We identify the order parameter to describe quantum phase transition as a pseudo-spin component and calculate this with the aid of the Matsubara propagators in the finite-temperature formalism. Our treatment is able to show that, at low temperature(< 0.1 K) and low value of charge imbalance regulatory parameter, there is a competition between the disorder and the inter-layer tunneling strength in the sample. The competition leads to the quasi-particle localization at low tunneling strength.
Keywords
EN
Year
Volume
122
Issue
4
Pages
741-747
Physical description
Dates
published
2012-10
received
2011-12-28
(unknown)
2012-06-20
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv122n420kz
Identifiers
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