Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-08-15
Journal of Physics and Chemistry of Solids 63, 2269 (2002)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 4 figures, contribution to SNS 2001, Chicago; author web page: http://pantheon.yale.edu/~subir; (v3) updated refs
Scientific paper
10.1016/S0022-3697(02)00245-7
We argue that aspects of the anomalous, low temperature, spin and charge dynamics of the high temperature superconductors can be understood by studying the corresponding physics of undoped Mott insulators. Such insulators display a quantum transition from a magnetically ordered Neel state to a confining paramagnet with a spin gap; the latter state has bond-centered charge order, a low energy S=1 spin exciton, confinement of S=1/2 spinons, and a free S=1/2 moment near non-magnetic impurities. We discuss how these characteristics, and the quantum phase transitions, evolve upon doping the insulator into a d-wave superconductor. This theoretical framework was used to make a number of predictions for STM measurements and for the phase diagram of the doped Mott insulator in an applied magnetic field.
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