Composite fermions close to the one-half filling of the lowest Landau level revisited

Details Composite fermions close to the one-half filling of the lowest Landau level revisited Composite fermions close to the one-half filling of the lowest Landau level revisited

2005-04-05

arxiv.org/abs/cond-mat/0504099v1

Int. J. Mod. Phys. B, Vol. 19, No. 4, 775-782 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 postscript figures

Scientific paper

10.1142/S021797920502772X

By strictly adhering to the microscopic theory of composite fermions for the Landau-level filling fractions nu_e = p/(2 p + 1), we reproduce, with remarkable accuracy, the surface-acoustic-wave (SAW)-based experimental results by Willett and co-workers concerning two-dimensional electron systems with nu_e close to 1/2. Our results imply that the electron band mass m_b, as distinct from the composite fermion mass m_*, must undergo a substantial increase under the conditions corresponding to nu_e approximately equal to 1/2. In view of the relatively low aerial electronic densities n_e to which the underlying SAW experiments correspond, our finding conforms with the experimental results by Shashkin et al. [Phys. Rev. B 66, 073303 (2002)], concerning two-dimensional electrons in silicon, that signal sharp increase in m_b for n_e decreasing below approximately 2 x 10^{11} cm^{-2}. We further establish that a finite mean-free path l_0 is essential for the observed linearity of the longitudinal conductivity sigma_{xx}(q) as deduced from the SAW velocity shifts.

Affiliated with

Also associated with

No associations

Rating

Composite fermions close to the one-half filling of the lowest Landau level revisited does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Composite fermions close to the one-half filling of the lowest Landau level revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite fermions close to the one-half filling of the lowest Landau level revisited will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-37747