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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…
Quantum Criticality: competing ground states in low dimensions
Subir Sachdev
Small changes in an external parameter can often lead to dramatic qualitative changes in the lowest energy quantum mechanical ground state of a correlated electron system. In aniso…
Renormalization group analysis of quantum critical points in d-wave superconductors
Matthias Vojta, Ying Zhang, Subir Sachdev
We describe a search for renormalization group fixed points which control a second-order quantum phase transition between a d_{x^2-y^2} superconductor and some other superconductin…
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…
Quantum phase transitions in d-wave superconductors
Matthias Vojta, Ying Zhang, Subir Sachdev
Motivated by the strong, low temperature damping of nodal quasiparticles observed in some cuprate superconductors, we study quantum phase transitions in d_{x^2-y^2} superconductors…