2003/06/05 by Cyrus F. Hirjibehedin, C. F. Hirjibehedin, A. Pinczuk +4 · 2 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.91.186802
published as Phys. Rev. Lett. 91, 186802 (2003) · 4 pages, 4 figures
arxiv created 2003/06/05 · openalex publication_date 2003/10/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
New low-lying excitations are observed by inelastic light scattering at filling factors \ensuremathν=p/(\ensuremathφp\ifmmode±\else\textpm\fi1) of the fractional quantum Hall regime with \ensuremathφ=4. Coexisting with these modes throughout the range \ensuremathν\ensuremath≤1/3 are \ensuremathφ=2 excitations seen at 1/3. Both \ensuremathφ=2 and \ensuremathφ=4 excitations have distinct behaviors with temperature and filling factor. The abrupt first appearance of the new modes in the low-energy excitation spectrum at \ensuremathν\ensuremath\lesssim1/3 suggests a marked change in the quantum ground state on crossing the \ensuremathφ=2\ensuremath→\ensuremathφ=4 boundary at \ensuremathν=1/3.