Magic-angle lasers in nanostructured moiré superlattice

Mao, Xinrui; Shao, Zengkai; Luan, Hong-Yi; Wang, Shaolei; Ma, Ren‐Min

doi:10.1038/s41565-021-00956-7

Cited by 105 publications

(66 citation statements)

References 52 publications

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“…The most recent theoretical predictions and experimental progresses of moiré lattices in optics community have proven the spectacular linear localization mechanism provided by the flat bands of the lattice [39,43]. It is thus natural to ask whether such new localization paradigm or regime can be complied with in our electromagnetically induced moiré optical lattices.…”

Section: Numerical Resultsmentioning

confidence: 99%

Electromagnetically induced moiré optical lattices in a coherent atomic gas

Chen,

Liu,

Zeng

2022

Preprint

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Electromagnetically induced optical (or photonic) lattices via atomic coherence in atomic ensembles have recently received great theoretical and experimental interest. We here conceive a way to generate electromagnetically induced moiré optical lattices-a twisted periodic pattern when two identical periodic patterns (lattices) are overlapped in a twisted angle (θ)-in a three-level coherent atomic gas working under electromagnetically induced transparency. We show that, changing the twisted angle and relative strength between the two constitutive sublattices, the moiré Bloch bands that are extremely flattened can always appear, resembling the typical flat-band and moiré physics found in other contexts. Dynamics of light propagation in the induced periodic structures demonstrating the unique linear localization and delocalization properties are also revealed. Our scheme can be implemented in a Rubidium atomic medium, where the predicted moiré optical lattices and flattened bands are naturally observable.

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Section: Numerical Resultsmentioning

confidence: 99%

Electromagnetically induced moiré optical lattices in a coherent atomic gas

Chen,

Liu,

Zeng

2022

Preprint

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“…The flatbands hosted by moiré superlattices is a remarkable feature that can be achieved by tuning the twisting angles ("magic angles" [12]), as well as by scanning the separations between the bilayer photonic slabs ("magic distances" [14]). The flatbands has been reported in mismatched hexagonal-lattice metacrystals [10], twisted bilayer honeycomb photonic crystals [7,12], and mismatched bilayer 1D photonic crystal slabs [14]. These flatbands are related to localized modes in moiré superlattices, and therefore are of great interest for enhancing light-matter interactions, such as lasing and optical nonlinear processes.…”

mentioning

confidence: 90%

“…The moiré superlattices host exotic electronic states in condensed-matter systems, leading to many salient physical phenomena, such as magic-angle graphene [1], moiré excitons [2], fractional Chern insulator [3], etc. By employing the correspondence between electronic waves and light waves, a surge of effort has been devoted recently to exploring moiré physics in optics [4][5][6][7][8][9][10][11][12][13], showing promising breakthroughs both fundamentally and practically. The flatbands hosted by moiré superlattices is a remarkable feature that can be achieved by tuning the twisting angles ("magic angles" [12]), as well as by scanning the separations between the bilayer photonic slabs ("magic distances" [14]).…”

mentioning

confidence: 99%

Flatband mode in photonic moiré superlattice for boosting second-harmonic generation with monolayer van der Waals crystals

Hong

Ying

et al. 2022

Opt. Lett.

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We theoretically investigate boosting second-harmonic generation (SHG) of monolayer van der Waals crystals by employing flatband modes hosted by photonic moiré superlattices. Such a system with high quality factor and a monolayer crystal accommodated on the top of it, provides a unique opportunity to enhance and manipulate SHG emission. We show that employing a doubly resonant diagram on such a moiré superlattice system not only boosts the SHG, but also tunes the directional emission of the second-harmonic wave. Moreover, we demonstrate that a structured beam illumination could further boost SHG, with the phase structure retrieved through a two-beam second-harmonic interference configuration. These results suggest the flatband modes in moiré superlattice as a promising platform for boosting SHG with monolayer van der Waals crystals, offering new possibilities for developing compact nonlinear photonic devices.

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“…[34][35][36][37][38][39][40][41] as well as the recent review [42] and references therein). These explorations have also inspired researchers to extendedly apply the twist approach to other physical systems, e.g., magnetic 2D materials [43][44][45][46] and photonic layered structures [47][48][49][50]. In overall, the properties of those systems are definitely dependent of their constituting layers and importantly, can be tuned by varying their twist angle, similar to those observed in TBLG.…”

Section: Introductionmentioning

confidence: 98%

Electronic properties of twisted multilayer graphene

Nguyen,

Hoang,

Charlier

2022

Preprint

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Twisted bilayer graphene displays many fascinating properties that can be tuned by varying the relative angle (also called twist angle) between its monolayers. As a remarkable feature, both the electronic flat bands and the corresponding strong electron localization have been obtained at a specific "magic" angle (∼ 1.1 • ), leading to the observation of several strongly correlated electronic phenomena. Such a discovery has hence inspired the creation of a novel research field called twistronics, i.e., aiming to explore novel physical properties in vertically stacked 2D structures when tuning the twist angle between the related layers. In this paper, a comprehensive and systematic study related to the electronic properties of twisted multilayer graphene (TMG) is presented based on atomistic calculations. The dependence of both the global and the local electronic quantities on the twist angle and on the stacking configuration are analyzed, fully taking into account atomic reconstruction effects. Consequently, the correlation between structural and electronic properties are clarified, thereby highlighting the shared characteristics and differences between various TMG systems as well as providing a comprehensive and essential overview. On the basis of these investigations, possibilities to tune the electronic properties are discussed, allowing for further developments in the field of twistronics.

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Magic-angle lasers in nanostructured moiré superlattice

Cited by 105 publications

References 52 publications

Electromagnetically induced moiré optical lattices in a coherent atomic gas

Electromagnetically induced moiré optical lattices in a coherent atomic gas

Flatband mode in photonic moiré superlattice for boosting second-harmonic generation with monolayer van der Waals crystals

Electronic properties of twisted multilayer graphene

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