Two-step breakdown of a local ν=1 quantum Hall state
| Autor: | Koji Muraki, Masayuki Hashisaka, Toshimasa Fujisawa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Filling factor Shot noise FOS: Physical sciences Conductance Heterojunction 02 engineering and technology Quantum Hall effect 021001 nanoscience & nanotechnology Polarization (waves) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics 0210 nano-technology Spin (physics) Quantum tunnelling |
| Zdroj: | Physical Review B. |
| Popis: | We report quantum Hall effect breakdown of a local filling factor v_local = 1 state formed in a bulk v_bulk = 2 system in an AlGaAs/GaAs heterostructure. When a finite source-drain bias is applied across the local system, the breakdown occurs in two steps. At low bias, quantized conductance through the v_local = 1 system breaks down due to inter-edge electron tunneling. At high bias, the incompressibility of the v_local = 1 system breaks down because the spin gap closes. The two steps are resolved by combining measurements of resistively detected nuclear magnetic resonance and shot noise, which allows one to evaluate electron spin polarization in the local system and spin-dependent charge transport through the system, respectively. 5 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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