Flat Bands in Magic-Angle Bilayer Photonic Crystals at Small Twists

Dong, Kaichen; Zhang, Tiancheng; Li, Jiachen; Wang, Qingjun; Yang, Fuyi; Rho, Yoonsoo; Wang, Danqing; Grigoropoulos, Costas P.; Wu, Junqiao; Yao, Jie

doi:10.1103/physrevlett.126.223601

Flat Bands in Magic-Angle Bilayer Photonic Crystals at Small Twists

Journal Article · Wed Jun 02 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.223601· OSTI ID:1821874

^[1]; Zhang, Tiancheng ^[2]; ^[1]; Wang, Qingjun ^[3]; Yang, Fuyi ^[3]; Rho, Yoonsoo ^[3]; Wang, Danqing ^[1]; ^[3]; ^[1]; ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Peking Univ., Beijing (China)
Univ. of California, Berkeley, CA (United States)

The new physics of magic-angle twisted bilayer graphene (TBG) motivated extensive studies of flat bands hosted by moiré superlattices in van der Waals structures, inspiring the investigations into their photonic counterparts with potential applications including Bose-Einstein condensation. However, correlation between photonic flat bands and bilayer photonic moiré systems remains unexplored, impeding further development of moiré photonics. In this work, we formulate a coupled-mode theory for low-angle twisted bilayer honeycomb photonic crystals as a close analogy of TBG, discovering magic-angle photonic flat bands with a non-Anderson-type localization. Moreover, the interlayer separation constitutes a convenient degree of freedom in tuning photonic moiré bands without high pressure. Furthermore, a phase diagram is constructed to correlate the twist angle and separation dependencies to the photonic magic angles. Our findings reveal a salient correspondence between fermionic and bosonic moiré systems and pave the avenue toward novel applications through advanced photonic band or state engineering.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1821874

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 126; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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