RCQM Distinguished Lecture Series - Steven Kivelson (Stanford)
Quenched disorder and vestigial nematicity in correlated electronic systems
Intermediate phases with “vestigial order” occur when the spontaneously broken symmetries of a “fully ordered” groundstate are restored sequentially as a function of increasingly strong thermal or quantum fluctuations, or of increasing magnitude of quenched randomness. As an important example, incommensurate charge-density-wave short-range order (i.e. with a finite correlation length) and a sharp phase transition to a phase with long-range nematic order is shown to be natural in the presence of weak quenched disorder in systems which, in the absence of disorder, would have unidirectional (stripe) ordered ground states. Recent experiments probing charge order in the pseudo-gap regime of the hole-doped cuprate high-temperature superconductors and nematic order in the Fe based superconductors are interpreted in light of these results.
Steven Kivelson is a member of the Stanford Institute for Materials and Energy Science, or SIMES, a joint institute of SLAC and Stanford, and a professor of physics at Stanford. Kivelson is a condensed matter theorist working on understanding the connections between the microscopic properties of electrons and molecules with the macroscopic and collective properties of materials. These include topics such as high-temperature superconductivity, quantum magnetism, quantum Hall effects and electronic liquid crystalline phases of matter. He received his doctorate from Harvard University in 1979 and was previously a professor of physics and astronomy at UCLA. Kivelson also has held appointments and fellowships at the University of Pennsylvania, UC-Santa Barbara, State University of New York-Stony Brook, Brookhaven National Laboratory and Rutgers University.