6 papers
Quantum Hall effect in single wide quantum wells
M. Abolfath, L. Belkhir, N. Nafari
We study the quantum Hall states in the lowest Landau level for a single wide quantum well. Due to a separation of charges to opposite sides of the well, a single wide well can be…
Spontaneous Interlayer Coherence in Double-Layer Quantum Hall Systems: Symmetry Breaking Interactions, In-Plane Fields and Phase Solitons
Kun Yang, K. Moon, Lotfi Belkhir +5
At strong magnetic fields double-layer two-dimensional-electron-gas systems can form an unusual broken symmetry state with spontaneous inter-layer phase coherence. The system can b…
Fractional quantum Hall effect in higher Landau levels
Lotfi Belkhir, J. K. Jain
We investigate, using finite size numerical calculations, the spin-polarized fractional quantum Hall effect (FQHE) in the first excited Landau level (LL). We find evidence for the…
Quantum and Many-Body Effects on the Capacitance of a Quantum Dot
Lotfi Belkhir
We calculate exactly, using finite size techniques, the quantum mechanical and many-body effects to the self-capacitance of a spherical quantum dot in the regime of extreme confine…
From Cooper Pairs to Composite Bosons: A Generalized RPA Analysis of Collective Excitations
Lotfi Belkhir, Mohit Randeria
The evolution of the ground state and the excitation spectrum of the two and three dimensional attractive Hubbard model is studied as the system evolves from a Cooper pair regime f…
Half-Integral Spin-Singlet Quantum Hall Effect
L. Belkhir, X. G. Wu, J. K. Jain
We provide numerical evidence that the ground state of a short range interaction model at is incompressible and spin-singlet for a wide range of repulsive interactions. Fur…