Valley polarization and susceptibility of composite fermions around nu=3/2

Autor:	Bishop, N. C., Padmanabhan, M., Vakili, K., Shkolnikov, Y. P., De Poortere, E. P., Shayegan, M.
Rok vydání:	2007
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.98.266404
Popis:	We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around Landau level filling factor nu = 3/2, demonstrating that the quasiparticles are composite Fermions (CFs) with a valley degree of freedom. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the CF valley susceptibility and polarization. The data can be explained well by a simple Landau level fan diagram for CFs, and are in nearly quantitative agreement with the results reported for CF spin polarization. Comment: to appear in Phys. Rev. Lett
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0706.1195 Zobrazit plný text záznamu View this record from Arxiv