Stability of the bilayer ν=1 quantum Hall state under charge imbalance

Autor:	Michael Pepper, Michelle Y. Simmons, Alex R. Hamilton, Adam P. Micolich, D. A. Ritchie, W. R. Clarke
Rok vydání:	2004
Předmět:	Physics Mean field theory Condensed matter physics Bilayer Quasiparticle Charge (physics) Monotonic function Quantum Hall effect Condensed Matter Physics Constant (mathematics) Stability (probability) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials
Zdroj:	Physica E: Low-dimensional Systems and Nanostructures. 22:40-43
ISSN:	1386-9477
Popis:	We study the stability of the bilayer νtot=1 quantum Hall (QH) state in a high mobility bilayer hole sample as carriers are transferred from one layer to the other while maintaining a constant total carrier density. For a total carrier density n tot =1.2×10 11 cm −2 , we show that the stability of the charge imbalanced QH state remains constant for small charge transfer, before increasing monotonically as the layer densities are imbalanced further. This behaviour is consistent with the predictions of Hartree–Fock mean field theory, but is contrary to previous experiments where a monotonic increase in the stability is observed. However, this monotonic increase in the stability can be reproduced in our samples at low density when n tot =8.2×10 10 cm −2 . The difference between experimental data and Hartree–Fock theory as total density is decreased suggests that excitations other than the quasiparticle and collective excitations may become significant.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e638baadca9c1f4ee51e3e899b8ce8e4 https://doi.org/10.1016/j.physe.2003.11.211 Zobrazit plný text záznamu Full Text from ScienceDirect