Video URL
https://pirsa.org/16100064Two Studies in Incommensurate Charge Order
APA
Flicker, F. (2016). Two Studies in Incommensurate Charge Order. Perimeter Institute for Theoretical Physics. https://pirsa.org/16100064
MLA
Flicker, Felix. Two Studies in Incommensurate Charge Order. Perimeter Institute for Theoretical Physics, Oct. 25, 2016, https://pirsa.org/16100064
BibTex
@misc{ scivideos_PIRSA:16100064, doi = {10.48660/16100064}, url = {https://pirsa.org/16100064}, author = {Flicker, Felix}, keywords = {Quantum Matter}, language = {en}, title = {Two Studies in Incommensurate Charge Order}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2016}, month = {oct}, note = {PIRSA:16100064 see, \url{https://scivideos.org/index.php/pirsa/16100064}} }
Felix Flicker University of Bristol
Abstract
Incommensurate charge order is a phenomenon in which the electrons in a crystal attempt to order with a period irrationally-related to that of
the lattice spacing. In the first half of this talk I will present recent work [1] in which we demonstrate that incommensurately charge-ordered systems can lower their free energy by forming quasicrystals: slices through higher-dimensional crystals with properties lying between periodicity and disorder. The result potentially greatly increases the number of known, naturally-occuring quasicrystals from the two present examples, both of which were found in the same Siberian meteorite. In the second half I will present work from an ongoing experimental collaboration in which atomically-resolved scanning tunneling microscopy and atomic force microscopy on semiconducting monolayers of molybdenum diselenide (MoSe2) see conducting edge states along one-dimensional mirror twin boundaries. Remarkably, these edge states then develop their own energy gap via charge ordering [2]. We see a number of features suggestive of incommensurate order. By employing a simple analytical model we demonstrate that the effect is in fact a result of fine-tuning between charge ordering and quantum well physics coming from the small system size (on the order of thirty atoms).
[1] F. Flicker and Jasper van Wezel, Physical Review Letters 115, 236401
(2015), Natural 1D Quasicrystals from Incommensurate Charge Order
[2] S. Barja et al., Nature Physics 12, 751-757 (2016), Charge density
wave order in 1D mirror twin boundaries of single-layer MoSe2