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The MagLab is funded by the National Science Foundation and the State of Florida.

Condensed Matter Seminars

The MagLab’s Condensed Matter Science Group hosts regular seminars featuring the work of visiting scientists. All seminars are open to the public and take place in Room B101 of the MagLab.

2023

Date: April 21, 2023

Speaker: Long Ju, MIT

Title: Electron correlation and topology in rhombohedral multilayer graphene

Host: Cyprian Lewandowski

Location: MagLab B 101 at 3:00 PM-4:00 PM

Abstract: Rhombohedral stacked multilayer graphene is an ideal platform to search for correlated electron phenomena, due to its pair of flat bands touching at zero energy and further tunability by an electric field. Furthermore, its valley-dependent Berry phase at zero energy points to possible topological states when the isospin symmetry is broken by electron correlation. In this talk, I will first show our efforts on the optical spectroscopy study of trilayer graphene/hBN moire superlattice. We observed optical signatures of flat moire band formation and Mott insulator due to band splitting at half-filling. Then I will talk about DC transport measurements of pentalayer graphene without any moire superlattices. We observed a plethora of correlated and topological states including a ferro-valleytronic half-metal, a correlated insulating state and Chern insulator states. Our results point to a new direction of exploring electron correlation and topology in natural 2D crystals where the layer number plays a critical role.


Date: March 3, 2023

Speaker: Jerome K. Hyun, Department of Chemistry and Nanoscience, Ewha Womans University, Korea

Title: Modulating light scattering and absorption for active structural colors

Host: Hanwei Gao (Physics)

Location: MagLab B 101 at 2:30 PM-4:30 PM

Abstract: Structural colors refer to colors arising from the scattering and interference of light by judiciously designed nanostructures. To be viable candidates for display or smart colorimetric sensing applications, their responses must be dynamic. To this end, our lab has worked on designs that can be tuned through a suite of external stimuli including electricity, humidity, and chemical vapor. Unlike plasmonic designs that require the excitation of surface plasmons, our approach mainly relies on photonic responses such as Mie resonances and dielectric waveguide-array modes which free our system from ohmic damping and the interdependence between wavelength and intensity. We also extend our approach to the microwave regime where unprecedentedly thin electromagnetic wave absorbers are realized.


Date: February 17, 2023

Speaker: Sergio de la Barrera, Massachusetts Institute of Technology

Title: Superconductivity in an engineered moiré quasiperiodic system

Host: Cyprian Lewandowski

Location: MagLab B 101 at 3:00 PM-4:00 PM

Abstract: View abstract


Date: February 3, 2023

Speaker: Pavan Hosur, University of Houston

Title: Superconductor vortices in Weyl semimetals

Host: Hitesh Changlani

Location: MagLab B 101 at 3:00 PM-4:30 PM

Abstract: View abstract



Last modified on 11 April 2023