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Title: Photonic spin Hall effect in bilayer graphene moiré superlattices

Abstract

The formation of a superstructure—with a related moiré pattern—plays a crucial role in the extraordinary optical and electronic properties of twisted bilayer graphene, including the recently observed unconventional superconductivity. Here we present an interdisciplinary approach to determine the moiré angle in twisted bilayer graphene based on the photonic spin Hall effect. Here, we show that the photonic spin Hall effect exhibits clear fingerprints of the underlying moiré pattern, and the associated light beam shifts are well beyond current experimental sensitivities in the near-infrared and visible ranges. By discovering the dependence of the frequency position of the maximal photonic spin Hall effect shift on the moiré angle, we argue that the latter could be unequivocally accessed via all-optical far-field measurements. We also disclose that, when combined with the Goos-Hänchen effect, the spin Hall effect of light enables the complete determination of the electronic conductivity of the bilayer. Altogether our findings demonstrate that subwavelength spin-orbit interactions of light provide an unprecedented toolset for investigating optoelectronic properties of multilayer two-dimensional van der Waals materials.

Authors:
 [1];  [2];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. Federal do Rio de Janeiro, Rio de Janeiro (Brazil). Inst. de Fisica
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1495156
Alternate Identifier(s):
OSTI ID: 1483033
Report Number(s):
LA-UR-18-27864
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
89233218CNA000001; NA150208
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 19; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kort-Kamp, W. J. M., Culchac, F. J., Capaz, Rodrigo B., and Pinheiro, Felipe A. Photonic spin Hall effect in bilayer graphene moiré superlattices. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.195431.
Kort-Kamp, W. J. M., Culchac, F. J., Capaz, Rodrigo B., & Pinheiro, Felipe A. Photonic spin Hall effect in bilayer graphene moiré superlattices. United States. doi:10.1103/PhysRevB.98.195431.
Kort-Kamp, W. J. M., Culchac, F. J., Capaz, Rodrigo B., and Pinheiro, Felipe A. Wed . "Photonic spin Hall effect in bilayer graphene moiré superlattices". United States. doi:10.1103/PhysRevB.98.195431.
@article{osti_1495156,
title = {Photonic spin Hall effect in bilayer graphene moiré superlattices},
author = {Kort-Kamp, W. J. M. and Culchac, F. J. and Capaz, Rodrigo B. and Pinheiro, Felipe A.},
abstractNote = {The formation of a superstructure—with a related moiré pattern—plays a crucial role in the extraordinary optical and electronic properties of twisted bilayer graphene, including the recently observed unconventional superconductivity. Here we present an interdisciplinary approach to determine the moiré angle in twisted bilayer graphene based on the photonic spin Hall effect. Here, we show that the photonic spin Hall effect exhibits clear fingerprints of the underlying moiré pattern, and the associated light beam shifts are well beyond current experimental sensitivities in the near-infrared and visible ranges. By discovering the dependence of the frequency position of the maximal photonic spin Hall effect shift on the moiré angle, we argue that the latter could be unequivocally accessed via all-optical far-field measurements. We also disclose that, when combined with the Goos-Hänchen effect, the spin Hall effect of light enables the complete determination of the electronic conductivity of the bilayer. Altogether our findings demonstrate that subwavelength spin-orbit interactions of light provide an unprecedented toolset for investigating optoelectronic properties of multilayer two-dimensional van der Waals materials.},
doi = {10.1103/PhysRevB.98.195431},
journal = {Physical Review B},
number = 19,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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This content will become publicly available on November 21, 2019
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Works referenced in this record:

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