Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-12-03
Phys. Rev. Lett. 80, 4494 (1998)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Version published in Phys. Rev. Lett. Figures changed to show SAW velocity shift. LaTeX, 5 pages, two included postscript figu
Scientific paper
10.1103/PhysRevLett.80.4494
Motivated by a recent experiment of Willett et al. [Phys. Rev. Lett. 78, 4478 (1997)], we employ semiclassical composite-fermion theory to study the effect of a periodic density modulation on a quantum Hall system near Landau level filling factor nu=1/2. We show that even a weak density modulation leads to dramatic changes in surface-acoustic-wave (SAW) propagation, and propose an explanation for several key features of the experimental observations. We predict that properly arranged dc transport measurements would show a structure similar to that seen in SAW measurements.
Halperin Bertrand I.
Stern Ady
von Oppen Felix
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