PhD University of Pennsylvania (1990)
Condensed Matter Theory
Research addresses aspects of strongly correlated electron systems: materials in which the motion of each charge carrier is greatly influenced by that of the other carriers. Current work focuses on “non-Fermi-liquid” physics (metallic behavior very different from that of conventional metals such as copper) arising near the absolute zero of temperature from (i) a bulk phase transition between different quantum-mechanical grounds states of a compound or alloy; or (ii) a transition between ground states of a magnetic nanostructure such as a quantum-dot device. The essential element in both cases is competition between different spatially extended degrees of freedom (e.g., conduction electrons, magnetic interactions, electromagnetic fluctuations) for control over the behavior of local spin degrees of freedom.
“Kondo destruction and valence fluctuations in an Anderson model,” J. H. Pixley, S. Kirchner, K. Ingersent, and Q. Si, Phys. Rev. Lett. 109, 086403 (2012).
“Signatures of quantum phase transitions in parallel quantum dots: Crossover from local moment to underscreened spin-1 Kondo physics,” A. Wong, W. B. Lane, L. G. V. V. Dias da Silva, K. Ingersent, N. Sandler, and S. E. Ulloa, Phys. Rev. B 85, 115316 (2012).
“Quantum phase transitions in a charge-coupled Bose-Fermi Anderson model,” M. Cheng, M. T. Glossop, and K. Ingersent, Phys. Rev. B 80, 165113 (2009).
“Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers,” L. G. G. V. Dias da Silva, N. Sandler, P. Simon, K. Ingersent, and S. E. Ulloa, Phys. Rev. Lett. 102, 166806 (2009).
“Finite-size scaling of classical long-ranged Ising chains and the criticality of dissipative quantum impurity models,” S. Kirchner, Q. Si, and K. Ingersent, Phys. Rev. Lett. 102, 166405 (2009).
“Magnetic quantum phase transition in an anisotropic Kondo lattice,” M. T. Glossop and K. Ingersent, Phys. Rev. Lett. 99, 227203 (2007).
“Zero-field Kondo splitting and quantum-critical transition in double quantum dots,” L. G. G. V. Dias da Silva, N. P. Sandler, K. Ingersent, and S. E. Ulloa, Phys. Rev. Lett. 97, 096603 (2006).
“Kondo screening in a magnetically frustrated nanostructure: Exact results on a stable, non-Fermi-liquid phase,” K. Ingersent, A. W. W. Ludwig, and I. Affleck, Phys. Rev. Lett. 95, 257204 (2005).
“Numerical renormalization-group study of the Bose-Fermi Kondo model,” M. T. Glossop and K. Ingersent, Phys. Rev. Lett. 95, 067202 (2005).
“Locally critical quantum phase transitions in strongly correlated metals,” Q. Si, S. Rabello, K. Ingersent, and J. L. Smith, Nature 413, 804 (2001).
“Renormalization-group study of Anderson and Kondo impurities in gapless Fermi systems,” C. Gonzalez-Buxton and K. Ingersent, Phys. Rev. B. 57, 14254 (1998).