Fermi Liquid Theory of a Fermi Ring

Details Fermi Liquid Theory of a Fermi Ring Fermi Liquid Theory of a Fermi Ring

2006-11-17

arxiv.org/abs/cond-mat/0611468v2

Phys. Rev. B 75, 115425 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 10 figures

Scientific paper

We study the effect of electron-electron interactions in the electronic properties of a biased graphene bilayer. This system is a semiconductor with conduction and valence bands characterized by an unusual ``mexican-hat'' dispersion. We focus on the metallic regime where the chemical potential lies in the ``mexican-hat'' in the conduction band, leading to a topologically non-trivial Fermi surface in the shape of a ring. We show that due to the unusual topology of the Fermi surface electron-electron interactions are greatly enhanced. We discuss the possibility of an instability towards a ferromagnetic phase due to this enhancement. We compute the electronic polarization function in the random phase approximation and show that, while at low energies the system behaves as a Fermi liquid (albeit with peculiar Friedel oscillations), at high frequencies it shows a highly anomalous response when compare to ordinary metals.

Affiliated with

Also associated with

No associations

Rating

Fermi Liquid Theory of a Fermi Ring 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 Fermi Liquid Theory of a Fermi Ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fermi Liquid Theory of a Fermi Ring will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-337887