HIGH FIELD NMR IN STRONGLY CORRELATED LOW-DIMENSIONAL FERMIONIC SYSTEMS

摘要

We review some recent NMR results obtained in Grenoble High Magnetic Field Laboratory on magnetic field induced phenomena in strongly correlated low-dimensional fermionic systems: i) magnetic field dependence of the soliton lattice in the IC phase of the spin-Peierls system CuGeO_3, ii) NMR study of the complete H-T phase diagram of the organo-metallic spin ladder Cu_2(C_5H_(12)N_2)_2Cl_4, and iii) the first "standard" NMR measurements (i.e., without optical pumping) on 2D electrons in Quantum wells, providing a detailed description of the fractional quantum Hall effect state at nu = 1/2 with the first determination of the corresponding effective polarization mass of composite fermions. Latest study of the nu= 2/3 State revealed, among other features, an unexpected phase transition.