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Static hole in a critical antiferromagnet: field-theoretic renormalization group
Subir Sachdev
We consider the quantum field theory of a single, immobile, spin S hole coupled to a two-dimensional antiferromagnet at a bulk quantum critical point between phases with and withou…
Non-magnetic impurities as probes of insulating and doped Mott insulators in two dimensions
Subir Sachdev, Matthias Vojta
We characterize paramagnetic Mott insulators by their response to static, non-magnetic impurities. States with spinon deconfinement (or spin-charge separation) are distinguished fr…
Impurity in a d-wave superconductor: Kondo effect and STM spectra
Anatoli Polkovnikov, Subir Sachdev, Matthias Vojta
We present a theory for recent STM studies of Zn impurities in the superconductor BSCCO, using insights from NMR experiments which show that there is a net S=1/2 moment on the Cu i…
Damping of collective modes and quasiparticles in d-wave superconductors
Subir Sachdev, Matthias Vojta
The two-dimensional d-wave superconducting state of the high temperature superconductors has a number of different elementary excitations: the spin-singlet Cooper pairs, the spin S…