80 citations · 218 across the 9 of their papers we have counts for
9 papers
Magnetic field induced quantum criticality and the Luttinger sum rule
Y. Nishikawa, O. J. Curtin, A. C. Hewson +1
We show that when there is a sudden transition from a small to a large Fermi surface at a field-induced quantum critical point, similar to what may have been observed in some heavy…
Fermi Liquids and the Luttinger Integral
O. J. Curtin, Y. Nishikawa, A. C. Hewson +1
The Luttinger Theorem, which relates the electron density to the volume of the Fermi surface in an itinerant electron system, is taken to be one of the essential features of a Ferm…
Conditions for observing emergent SU(4) symmetry in a double quantum dot
Yunori Nishikawa, Oliver J. Curtin, Alex C. Hewson +2
We analyze conditions for the observation of a low energy SU(4) fixed point in capacitively coupled quantum dots. One problem, due to dots with different couplings to their baths,…
Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
Yunori Nishikawa, Alex C. Hewson, Daniel J. G. Crow +1
We examine the low energy behavior of a double quantum dot in a regime where spin and pseudospin excitations are degenerate. The individual quantum dots are described by Anderson i…
Phase diagram and critical points of a double quantum dot
Y. Nishikawa, D. J. G. Crow, A. C. Hewson
We apply a combination of numerical renormalization group (NRG) and renormalized perturbation theory (RPT) to a model of two quantum dots (impurities) described by two Anderson imp…
Convergence of energy scales on the approach to a local quantum critical point
Y. Nishikawa, D. J. G. Crow, A. C. Hewson
We find the emergence of strong correlations and universality on the approach to the quantum critical points of a two impurity Anderson model. The two impurities are coupled by an…