Valley-polarized quantum Hall phase in a strain-controlled Dirac system - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2024

Valley-polarized quantum Hall phase in a strain-controlled Dirac system

Résumé

In multivalley systems, the valley pseudospin offers rich physics going from encoding of information by its polarization (valleytronics), to exploring novel phases of matter when its degeneracy is changed. Here, by strain engineering, we reveal fully valley-polarized quantum Hall (QH) phases in the Pb1-xSnxSe Dirac system. Remarkably, when the valley energy splitting exceeds the fundamental band gap, we observe a bipolar QH phase, heralded by the coexistence of hole and electron chiral edge states at distinct valleys in the same quantum well. This suggests that spatially overlaid counter-propagating chiral edge states emerging at different valleys do not interfere with each other.
Fichier principal
Vignette du fichier
2401.02159.pdf (1.59 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04554227 , version 1 (22-04-2024)

Identifiants

Citer

G. Krizman, J. Bermejo-Ortiz, T. Zakusylo, M. Hajlaoui, T. Takashiro, et al.. Valley-polarized quantum Hall phase in a strain-controlled Dirac system. Physical Review Letters, 2024, 132 (16), pp.166601. ⟨10.1103/PhysRevLett.132.166601⟩. ⟨hal-04554227⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More