Abstract
We report large signal current–voltage characteristics measurements near the ν=1 integer quantum Hall plateau in a high mobility GaAs/AlGaAs sample that exhibits both single particle and collective localization. According to prior results, the central part of the ν=1 plateau corresponds to single particle localization and hence an Anderson insulator. In contrast, the two regions in the flanks of this Anderson insulator were associated with collective localization and were identified with the integer quantum Hall Wigner solid. We find that, at low temperatures and under large bias currents, both the Anderson insulator and integer quantum Hall Wigner solid have a sharp onset of conduction above a threshold. Furthermore, this threshold shows an approximately monotonic dependence on the filling factor across the boundary between the two localized phases. To our surprise, we find that these large signal characteristics do not clearly distinguish between the Anderson insulator and the integer quantum Hall Wigner solid.
Original language | English (US) |
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Article number | 114876 |
Journal | Solid State Communications |
Volume | 353 |
DOIs | |
State | Published - Sep 15 2022 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
Keywords
- Current–voltage characteristic
- Integer quantum Hall Winger solid
- Two-dimensional electron gas