Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-12-28
Revised version published in Physical Review B 71, 155307 (2005).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
REVTEX; 12 pages, 5 figures; submitted to Phisical Review B
Scientific paper
10.1103/PhysRevB.71.155307
The effects of interactions in a 2D electron system in a strong magnetic field of two degenerate Landau levels with opposite spins and at filling factors 1/2 are studied. Using the Chern-Simons gauge transformation, the system is mapped to Composite Fermions. The fluctuations of the gauge field induce an effective interaction between the Composite Fermions which can be attractive in both the particle-particle and in the particle-hole channel. As a consequence, a spin-singlet (s-wave) ground state of Composite Fermions can exist with a finite pair-breaking energy gap for particle-particle or particle-hole pairs. The competition between these two possible ground states is discussed. For long-range Coulomb interaction the particle-particle state is favored if the interaction strength is small. With increasing interaction strength there is a crossover towards the particle-hole state. If the interaction is short range, only the particle-particle state is possible.
Kramer Bernhard
Magnoli Nicodemo
Merlo Matteo
Sassetti Maura
No associations
LandOfFree
On ground states of interacting Composite Fermions with spin at half filling 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 On ground states of interacting Composite Fermions with spin at half filling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On ground states of interacting Composite Fermions with spin at half filling will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-513822