3,275 research outputs found
Theory of Electron Spin Relaxation in n-Doped Quantum Wells
Recent experiments have demonstrated long spin lifetimes in uniformly n-doped
quantum wells. The spin dynamics of exciton, localized, and conduction spins
are important for understanding these systems. We explain experimental behavior
by invoking spin exchange between all spin species. By doing so we explain
quantitatively and qualitatively the striking and unusual temperature
dependence in (110)-GaAs quantum wells. We discuss possible future experiments
to resolve the pertinent localized spin relaxation mechanisms. In addition, our
analysis allows us to propose possible experimental scenarios that will
optimize spin relaxation times in GaAs and CdTe quantum wells.Comment: Small corrections made. Accepted to Phys. Rev. B. 8 pages, 5 figure
Quantum phases in a doped Mott insulator on the Shastry-Sutherland lattice
We propose the projected BCS wave function as the ground state for the doped
Mott insulator SrCu2(BO3)2 on the Shastry-Sutherland lattice. At half filling
this wave function yields the exact ground state. Adding mobile charge
carriers, we find a strong asymmetry between electron and hole doping. Upon
electron doping an unusual metal with strong valence bond correlations forms.
Hole doped systems are d-wave RVB superconductors in which superconductivity is
strongly enhanced by the emergence of inhomogeneous plaquette bond order.Comment: 4 pages, 3 figure
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