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Title: 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:
ORCiD logo [1];  [2];  [2]
  1. Georgia State University, Atlanta, GA (United States); Max Planck Institute for the Science of Light, Erlangen (Germany)
  2. 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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