Friday 07/04/2023, 11:00
FORTH Seminar Room 1
Dr. Tribhuwan Pandey
University of Antwerp (UA), Antwerp, Belgium
e-mail: [email protected]
Abstract:
Flexoelectricty is the coupling of polarization and strain gradients, which can be detected by bending a material. Flexoelectricity can be found in a wide range of materials, including soft matter, liquid
crystals, and crystalline materials, although it is only noticeable at short-length scales, where strong
strain gradients emerge. In this talk, I’ll discuss recent developments in the computation of optoelectronic and flexoelectric properties under strain gradient using first-principles approaches. Furthermore, flexoelectric properties of rippled monolayer InSe and MoS2, using the density functional theory and phenomenological Landau approach will be discussed. In these monolayers, the flexoelectric effect outperforms the piezoelectric effect in both in-plane and out-of-plane directions. A realistic strain gradient of roughly ~ 1 nm-1 can induce an order of magnitude higher flexoelectric response than the piezoelectric one. These findings will be discussed in the context of recent experimental measurements.