Subir Sachdev of Harvard University has made prolific contributions to quantum condensed matter physics, including research on quantum phase transitions and their application to correlated electron materials like high temperature superconductors. In recent years, Sachdev has exploited a remarkable connection between the electronic properties of materials near a quantum phase transition and the quantum theory of black holes. His 1999 book, Quantum Phase Transitions, has been described as "required reading for any budding theorist."
Past PI Talks:
• “Quantum criticality and black holes”: http://pirsa.org/08040006
• “Nodal Quasiparticles and Spin and Charge Order in the Cuprate Superconductors”: http://pirsa.org/08040031.
• All of Prof. Sachdev’s past PI research talks may be viewed here.
My research describes the connection between physical properties of modern quantum materials and the nature of quantum entanglement in the many-particle wavefunction. I have made contributions to the description of the diverse varieties of entangled states of quantum matter. These include states with topological order, with and without an energy gap to excitations, and critical states without quasiparticle excitations. Many of these contributions have been linked to experiments, especially to the rich phase diagrams of the high temperature superconductors.
Extreme examples of complex quantum entanglement arise in metallic states of matter without quasiparticle excitations, often called strange metals. Remarkably, there is an intimate connection between the quantum physics of strange metals found in modern materials (which can be studied in tabletop experiments), and quantum entanglement near black holes of astrophysics. I have exploited this connection to advance our understanding of experiments on strange metals