Conveners
Condensed Matter Theory
- Robert Petry
I will discuss a notion of topology “hidden” in Landau’s theory of phase transitions. When the order parameter comprises several components in the same irreducible representation of symmetry, it can possess a nontrivial topology and acquire a Berry phase under the variation of thermodynamic parameters. To illustrate this idea, I will focus on the superconducting phase transition of an...
We generalize the Momentum Average (MA) approximation to compute the finite temperature spectral functions of the Holstein polaron in a one-dimensional system. We validate our MA results in 1D against available numerical data from density matrix renormalization group (DMRG) and the finite-temperature Lanczos method, establishing the accuracy of the MA results which are obtained at a...
The collapse of large-diameter, chiral, single-walled carbon nanotubes (SWCNTs) can form bilayer-like ribbons, characterized by quasi-one-dimensional (1D) moiré superlattices and exotic electronic behavior. Using analytical treatments of diameter, chirality, and moiré twist angles, we demonstrate that the moiré wavelength approximates the width of the collapsed SWCNT, producing quasi-1D moiré...
