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Title: Twist, slip, and circular dichroism in bilayer graphene

Abstract

Stacking atomically thin two-dimensional materials with a rotational misalignment between their layers produces a van der Waals bilayer in which all mirror symmetries can be broken. A fundamental experimental signature of a twisted multilayer is circular dichroism (CD): the conversion of a linearly polarized incident optical field to an elliptically polarized field in transmission. This work investigates the relations between CD, the twist angle, and interlayer slip. In experiments where bilayers are formed by contacting one layer with another, the relative rotation angle between the symmetry axes of each sheet are controlled, but the lateral shifts between the layers are not. Accounting for the lateral shift between the layers expands the configuration space of twisted bilayer structures. Here we demonstrate how the symmetry constraints in this expanded configuration space are expressed in the CD spectrum of twisted bilayer graphene as a function of the rotation angle and interlayer slip.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
  2. Chicago State Univ., IL (United States). Dept. of Chemistry, Inst. for Molecular Engineering, James Franck Inst.
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1562497
Grant/Contract Number:  
FG02-84ER45118
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Bilayers; ChiralityOptical conductivity; Graphene; Optical materials & elements; Optical spectroscopy; Condensed Matter & Materials Physics

Citation Formats

Addison, Zachariah, Park, Jiwoong, and Mele, E. J. Twist, slip, and circular dichroism in bilayer graphene. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.125418.
Addison, Zachariah, Park, Jiwoong, & Mele, E. J. Twist, slip, and circular dichroism in bilayer graphene. United States. doi:10.1103/PhysRevB.100.125418.
Addison, Zachariah, Park, Jiwoong, and Mele, E. J. Fri . "Twist, slip, and circular dichroism in bilayer graphene". United States. doi:10.1103/PhysRevB.100.125418. https://www.osti.gov/servlets/purl/1562497.
@article{osti_1562497,
title = {Twist, slip, and circular dichroism in bilayer graphene},
author = {Addison, Zachariah and Park, Jiwoong and Mele, E. J.},
abstractNote = {Stacking atomically thin two-dimensional materials with a rotational misalignment between their layers produces a van der Waals bilayer in which all mirror symmetries can be broken. A fundamental experimental signature of a twisted multilayer is circular dichroism (CD): the conversion of a linearly polarized incident optical field to an elliptically polarized field in transmission. This work investigates the relations between CD, the twist angle, and interlayer slip. In experiments where bilayers are formed by contacting one layer with another, the relative rotation angle between the symmetry axes of each sheet are controlled, but the lateral shifts between the layers are not. Accounting for the lateral shift between the layers expands the configuration space of twisted bilayer structures. Here we demonstrate how the symmetry constraints in this expanded configuration space are expressed in the CD spectrum of twisted bilayer graphene as a function of the rotation angle and interlayer slip.},
doi = {10.1103/PhysRevB.100.125418},
journal = {Physical Review B},
number = 12,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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Cited by: 6 works
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