HgTe quantum wells for QHE metrology under soft cryomagnetic conditions: permanent magnets and liquid ${^4He}$ temperatures - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

HgTe quantum wells for QHE metrology under soft cryomagnetic conditions: permanent magnets and liquid ${^4He}$ temperatures

I. Yahniuk
  • Fonction : Auteur
A. Kazakov
  • Fonction : Auteur
Benoit Jouault
S. Kret
  • Fonction : Auteur
G. Grabecki
  • Fonction : Auteur
G. Cywiński
  • Fonction : Auteur
N. N. Mikhailov
  • Fonction : Auteur
S. A. Dvoretskii
  • Fonction : Auteur
J. Przybytek
  • Fonction : Auteur
V. I. Gavrilenko
  • Fonction : Auteur
Frederic Teppe
T. Dietl
  • Fonction : Auteur

Résumé

HgTe quantum wells with a thickness of ${\sim}$7 nm may have a graphene-like band structure and have been recently proposed to be potential candidates for quantum Hall effect (QHE) resistance standards under the condition of operation in the fields above certain critical field $B_c$, above which the topological phase (with parasitic edge conduction) disappears. We present experimental studies of the magnetoresistance of different of HgTe quantum wells as a function temperature and magnetic field, determining the critical magnetic field $B_c$. We demonstrate that for QWs of specific width $B_c$ becomes low enough to grant observation of remarkably wide QHE plateaus at the filling factor ${v=-1}$ (holes) in relaxed cryomagnetic conditions: while using commercial 0.82 T Neodymium permanent magnets and temperature of a few Kelvin provided by ${^4He}$ liquid system only. Band structure calculations allow us to explain qualitatively observed phenomena due to the interplay between light holes and heavy holes energy sub-bands (side maxima of the valence band). Our work clearly shows that the peculiar band structure properties of HgTe QWs with massless Dirac fermions make them an ideal platform for developing metrological devices with relaxed cryomagnetic conditions.
Fichier principal
Vignette du fichier
2111.07581.pdf (1.65 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03442316 , version 1 (23-11-2021)

Identifiants

Citer

I. Yahniuk, A. Kazakov, Benoit Jouault, S. S. Krishtopenko, S. Kret, et al.. HgTe quantum wells for QHE metrology under soft cryomagnetic conditions: permanent magnets and liquid ${^4He}$ temperatures. 2021. ⟨hal-03442316⟩
66 Consultations
27 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More