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Title: Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices

Abstract

Highly uniform and ordered nanodot arrays are crucial for high-performance quantum optoelectronics, including new semiconductor lasers and single-photon emitters, and for synthesizing artificial lattices of interacting quasiparticles toward quantum information processing and simulation of many-body physics. Van der Waals heterostructures of two-dimensional semiconductors are naturally endowed with an ordered nanoscale landscape, that is, the moiré pattern that laterally modulates electronic and topographic structures. We find that these moiré effects realize superstructures of nanodot confinements for long-lived interlayer excitons, which can be either electrically or strain tuned from perfect arrays of quantum emitters to excitonic superlattices with giant spin-orbit coupling (SOC). Besides the wide-range tuning of emission wavelength, the electric field can also invert the spin optical selection rule of the emitter arrays. This unprecedented control arises from the gauge structure imprinted on exciton wave functions by the moiré, which underlies the SOC when hopping couples nanodots into superlattices. We show that the moiré hosts complex hopping honeycomb superlattices, where exciton bands feature a Dirac node and two Weyl nodes, connected by spin-momentum–locked topological edge modes.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [1]
  1. Univ. of Hong Kong (China)
  2. Beijing Institute of Technology (China)
  3. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Research Org.:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1499933
Grant/Contract Number:  
SC0008145; SC0012509
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Yu, Hongyi, Liu, Gui-Bin, Tang, Jianju, Xu, Xiaodong, and Yao, Wang. Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices. United States: N. p., 2017. Web. https://doi.org/10.1126/sciadv.1701696.
Yu, Hongyi, Liu, Gui-Bin, Tang, Jianju, Xu, Xiaodong, & Yao, Wang. Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices. United States. https://doi.org/10.1126/sciadv.1701696
Yu, Hongyi, Liu, Gui-Bin, Tang, Jianju, Xu, Xiaodong, and Yao, Wang. Fri . "Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices". United States. https://doi.org/10.1126/sciadv.1701696. https://www.osti.gov/servlets/purl/1499933.
@article{osti_1499933,
title = {Moiré excitons: From programmable quantum emitter arrays to spin-orbit–coupled artificial lattices},
author = {Yu, Hongyi and Liu, Gui-Bin and Tang, Jianju and Xu, Xiaodong and Yao, Wang},
abstractNote = {Highly uniform and ordered nanodot arrays are crucial for high-performance quantum optoelectronics, including new semiconductor lasers and single-photon emitters, and for synthesizing artificial lattices of interacting quasiparticles toward quantum information processing and simulation of many-body physics. Van der Waals heterostructures of two-dimensional semiconductors are naturally endowed with an ordered nanoscale landscape, that is, the moiré pattern that laterally modulates electronic and topographic structures. We find that these moiré effects realize superstructures of nanodot confinements for long-lived interlayer excitons, which can be either electrically or strain tuned from perfect arrays of quantum emitters to excitonic superlattices with giant spin-orbit coupling (SOC). Besides the wide-range tuning of emission wavelength, the electric field can also invert the spin optical selection rule of the emitter arrays. This unprecedented control arises from the gauge structure imprinted on exciton wave functions by the moiré, which underlies the SOC when hopping couples nanodots into superlattices. We show that the moiré hosts complex hopping honeycomb superlattices, where exciton bands feature a Dirac node and two Weyl nodes, connected by spin-momentum–locked topological edge modes.},
doi = {10.1126/sciadv.1701696},
journal = {Science Advances},
number = 11,
volume = 3,
place = {United States},
year = {2017},
month = {11}
}

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Figures / Tables:

Fig. 1. Fig. 1.: Moiré modulated local energy gaps and topographic height in the heterobilayer. (A) Long-period moiré pattern in an MoX2/WX2 heterobilayer. Green diamond is a supercell. Insets are close-ups of three locals, where atomic registries resemble lattice-matched bilayers of different R-type stacking. (B and C) Dependence of interlayer distance dmore » on the atomic registries. In (C), dots are our first-principles calculations for the MoS2/WSe2 heterobilayer, and triangles are the scanning tunneling microscopy (STM) measured variation of the local d values in a b = 8.7 nm MoS2/WSe2 moiré in the study of Zhang et al. (26). The variation in d then leads to laterally modulated interlayer bias (∝ d) in a uniform perpendicular electric field, as (B) illustrates. (D) Schematic of relevant heterobilayer bands at the K valley, predominantly localized in either the MoX2 or WX2 layer. (E) Top: Variation of the local bandgap $E$g [black arrow in (D)] in the MoS2/WSe2 moiré. Bottom: Variation of the local intralayer gaps [denoted by arrows of the same color in (D)]. In (C) and (E), the horizontal axis corresponds to the long diagonal of the moiré supercell, and the vertical axis plots the differences of the quantities from their minimal values. The curves are fitting of the data points using eqs. S2 and S3 in section S1.« less

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