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Title: Photonic spin Hall effect in bilayer graphene moiré superlattices

Journal Article · · Physical Review B
 [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

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1495156
Report Number(s):
LA-UR--18-27864
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 19 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Ultrasensitive detection of ion concentration based on photonic spin Hall effect journal December 2019
Precision Measurement of the Optical Conductivity of Atomically Thin Crystals via the Photonic Spin Hall Effect journal January 2020
Landau quantisation of photonic spin Hall effect in monolayer black phosphorus journal December 2019
Precision Measurement of the Optical Conductivity of Atomically Thin Crystals via Photonic Spin Hall Effect text January 2019