Effects of non-uniform strain in transition-metal dichalcogenides

Seminar
Optics Seminar
QUEST Center event
No
Speaker
Dr. Moshe Harats
Date
08/05/2024 - 12:30 - 11:00Add to Calendar 2024-05-08 11:00:00 2024-05-08 12:30:00 Effects of non-uniform strain in transition-metal dichalcogenides 2D materials are elastic materials that can sustain high strain. While the response of these materials to spatially uniform strain is well studied, the effects of spatially non-uniform strain are understood much less. In this talk I will show the response of transition metal dichalcogenides monolayers under non-uniform strain. It was predicted that non-uniform strain will allow transport or “funneling” of neutral charge excitons which can be useful as an efficient solar cell[1].  I show that while transport or “funneling” of excitons is relatively inefficient, a different process, a strain-related conversion of excitons to trions is dominant and is universal for any configuration of non-uniform strain[2-3]. Lastly, I will discuss different experimental directions that will allow high “funneling” efficiency by straining heterostructures[4,5]. J. Feng, X. Qian, C.-W. Huang, and J. Li, Nature Photonics 6, (2012), 866–872. M. G. Harats, J. N. Kirchhof, M. Qiao, K. Greben, and K. I. Bolotin, Nature Photonics, 14 (5), (2020), 324-329 S. Kovalchuk, M. G. Harats, G. López-Polín, J. N. Kirchhof, K. Höflich, K. I. Bolotin, 2D Materials 7 (3), (2020), 035024 M. G. Harats, K. I. Bolotin, 2D Materials 8 (1), (2020), 015010 S. Kovalchuk, J. N. Kirchhof, K.I. Bolotin, M. G. Harats, Israel Journal of Chemistry 62 (3-4), (2022), e20210011 Resnick Bldg. Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick Bldg.
Abstract

2D materials are elastic materials that can sustain high strain. While the response of these materials to spatially uniform strain is well studied, the effects of spatially non-uniform strain are understood much less. In this talk I will show the response of transition metal dichalcogenides monolayers under non-uniform strain. It was predicted that non-uniform strain will allow transport or “funneling” of neutral charge excitons which can be useful as an efficient solar cell[1].  I show that while transport or “funneling” of excitons is relatively inefficient, a different process, a strain-related conversion of excitons to trions is dominant and is universal for any configuration of non-uniform strain[2-3]. Lastly, I will discuss different experimental directions that will allow high “funneling” efficiency by straining heterostructures[4,5].

  1. J. Feng, X. Qian, C.-W. Huang, and J. Li, Nature Photonics 6, (2012), 866–872.
  2. M. G. Harats, J. N. Kirchhof, M. Qiao, K. Greben, and K. I. Bolotin, Nature Photonics, 14 (5), (2020), 324-329
  3. S. Kovalchuk, M. G. Harats, G. López-Polín, J. N. Kirchhof, K. Höflich, K. I. Bolotin, 2D Materials 7 (3), (2020), 035024
  4. M. G. Harats, K. I. Bolotin, 2D Materials 8 (1), (2020), 015010
  5. S. Kovalchuk, J. N. Kirchhof, K.I. Bolotin, M. G. Harats, Israel Journal of Chemistry 62 (3-4), (2022), e20210011

Last Updated Date : 05/05/2024