Unconventional reentrant quantum Hall effect in a HgTe/CdHgTe double quantum well
| Autor: | M. V. Yakunin, S. M. Podgornykh, Benoit Jouault, Wilfried Desrat, Sergey A. Dvoretsky, Frederic Teppe, Sergey S. Krishtopenko, N. N. Mikhailov, V. N. Neverov, M. R. Popov |
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| Přispěvatelé: | Université de Montpellier (UM), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Valence (chemistry) Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics FOS: Physical sciences 02 engineering and technology Light hole Quantum Hall effect 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Magnetic field Reentrancy 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Double quantum [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B Physical Review B, American Physical Society, 2020, 102 (16), ⟨10.1103/PhysRevB.102.165305⟩ |
| ISSN: | 2469-9950 2469-9969 |
| Popis: | We report on observation of an unconventional structure of the quantum Hall effect (QHE) in a $ p$-type HgTe/Cd$_x$Hg$_{1-x}$Te double quantum well (DQW) consisting of two HgTe layers of critical width. The observed QHE is a reentrant function of magnetic field between two $i=2$ states (plateaus at $\rho_{xy}=h/ie^2$) separated by an intermediate $i=1$ state, which looks like some anomalous peak on the extra-long $i=2$ plateau when weakly expressed. The anomalous peak apparently separates two different regimes: a traditional QHE at relatively weak fields for a small density of mobile holes $p_s$ and a high-field QH structure with a $2-1$ plateau--plateau transition corresponding to much larger $p_s$. We show that only a part of holes, residing in an additional light hole subband in the DQW, participate in QHE at weak fields while the rest of holes is excluded into the reservoir formed in the lateral maximum of the valence subband. All the holes come into play at high fields due to a peculiar behavior of the zero-mode levels. Comment: 7 pages, 5 figures |
| Databáze: | OpenAIRE |
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