Starting now in L. Stasi: - Special CMSP Seminar by Luis E. F. Foa Torres, 29 June, 2PM

[CMSP Seminars Secretariat]

*Special CMSP Seminar*

** * * 29 June**2023, 2:00PM***** * **

In person: *Luigi Stasi Seminar Room **(Leonardo Building, second floor)***
**
/Zoom: 
https://zoom.us/meeting/register/tJYkdOqvrDIoHNac51PzHLSktLxTQzGWtVTf/<https://zoom.us/meeting/register/tJIsfuuhqjsrE9EZY2loNxNobg8Lf39NUVHJ>

Speaker:*Luis E. F. Foa Torres *(Universidad de Chile)

Title:*Surprises from electron-photon and electron-phonon interactions 
in two-dimensional materials**
*

Abstract:

In this talk, I will delve into two new topics in the field of 
two-dimensional (2D) materials physics: the impact of strong laser 
illumination on materials with an existing topological phase, and the 
interaction between electrons and chiral phonons. The first part of my 
talk will explore how intense laser illumination can be used to generate 
tunable spin-polarized photocurrents in the presence of spin-orbit 
interaction [1], and how it can cause a switch in chirality of the edge 
states in graphene when in the quantum Hall regime [2]. In the second 
part, I will tackle the intriguing issue of electron-phonon interactions 
with chiral phonons. The theoretical prediction [3] and subsequent 
observation [4] of chiral phonons in 2D materials has added a fresh 
dimension to this persistent challenge. I will present an overview of 
this area, emphasizing our recent findings on the effects of 
electron-chiral phonon interactions in 2D materials [5-7]. By using a 
non-perturbative solution, we demonstrate that chiral phonons trigger 
inelastic Umklapp processes, leading to peculiar co-propagating edge 
states. Our results hint on the possibility of having new 
electron-phonon states of matter.

[1] M. Berdakin, E. A. Rodriguez-Mena, and L. E. F. Foa Torres, Nano 
Letters 21, 3177 (2021).
[2] A. Huaman, L. E. F. Foa Torres, C. A. Balseiro, L. E. F. Foa Torres, 
Phys. Rev. Research 3, 013201 (2021).
[3] L. Zhang and Q. Niu, Phys. Rev. Lett. 115, 115502 (2015).
[4] H. Zhu et al., Science 359, 579 (2018).
[5] J. Medina Dueñas, H. L. Calvo, L. E. F. Foa Torres, Phys. Rev. Lett. 
128, 066801 (2022).
[6] J. Mella, H. L. Calvo, L. E. F. Foa Torres, to appear.
[7] For related research see https://www.foatorres.com/

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CMSP, Condensed Matter & Statistical Physics Section
http://www.ictp.it/research/cmsp.aspx

The Abdus Salam International Centre for Theoretical Physics
https://www.ictp.it/

    
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