Ultrafast valley polarization in bilayer graphene
Abstract
We study theoretically the interaction of a bilayer graphene with a circularly polarized ultrafast optical pulse of a single oscillation at an oblique incidence. The normal component of the pulse breaks the inversion symmetry of the system and opens up a dynamical bandgap due to which a valley-selective population of the conduction band becomes sensitive to the angle of incident of the pulse. We show that the magnitude of the valley polarization can be controlled by the angle of incidence, the amplitude, and the angle of in-plane polarization of the chiral optical pulse. Subsequently, a sequence of a circularly polarized pulse followed by a linearly polarized femtosecond-long pulse can be used to control and probe the valley polarization created by the preceding pulse. Our protocol provides a favorable platform to design ultrafast all-optical valleytronic information processing.
- Authors:
-
- Georgia State University, Atlanta, GA (United States); Max Planck Institute for the Science of Light, Erlangen (Germany)
- Georgia State University, Atlanta, GA (United States)
- Publication Date:
- Research Org.:
- Georgia State Univ., Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); US Department of the Navy, Office of Naval Research (ONR); University of Central Florida; US Air Force Office of Scientific Research (AFOSR); Emory University; National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1978945
- Alternate Identifier(s):
- OSTI ID: 1827750
- Grant/Contract Number:
- FG02-01ER15213; SC0007043; N000-14-17-1-2588; FA9550-15-1-0037; EFMA-1741691; CMMI 1661618; FG02-11ER46789
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 130; Journal Issue: 16; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Hall effect; electronic band structure; information technology; photoelectron emission spectroscopy; crystal structure; graphene; optical field; chirality; quantum computing; Fermi-Dirac distribution
Citation Formats
Kumar, Pardeep, Herath, Thakshila M., and Apalkov, Vadym. Ultrafast valley polarization in bilayer graphene. United States: N. p., 2021.
Web. doi:10.1063/5.0060138.
Kumar, Pardeep, Herath, Thakshila M., & Apalkov, Vadym. Ultrafast valley polarization in bilayer graphene. United States. https://doi.org/10.1063/5.0060138
Kumar, Pardeep, Herath, Thakshila M., and Apalkov, Vadym. Wed .
"Ultrafast valley polarization in bilayer graphene". United States. https://doi.org/10.1063/5.0060138. https://www.osti.gov/servlets/purl/1978945.
@article{osti_1978945,
title = {Ultrafast valley polarization in bilayer graphene},
author = {Kumar, Pardeep and Herath, Thakshila M. and Apalkov, Vadym},
abstractNote = {We study theoretically the interaction of a bilayer graphene with a circularly polarized ultrafast optical pulse of a single oscillation at an oblique incidence. The normal component of the pulse breaks the inversion symmetry of the system and opens up a dynamical bandgap due to which a valley-selective population of the conduction band becomes sensitive to the angle of incident of the pulse. We show that the magnitude of the valley polarization can be controlled by the angle of incidence, the amplitude, and the angle of in-plane polarization of the chiral optical pulse. Subsequently, a sequence of a circularly polarized pulse followed by a linearly polarized femtosecond-long pulse can be used to control and probe the valley polarization created by the preceding pulse. Our protocol provides a favorable platform to design ultrafast all-optical valleytronic information processing.},
doi = {10.1063/5.0060138},
journal = {Journal of Applied Physics},
number = 16,
volume = 130,
place = {United States},
year = {Wed Oct 27 00:00:00 EDT 2021},
month = {Wed Oct 27 00:00:00 EDT 2021}
}
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