Magic-angle magnonic nanocavity in a magnetic moiré superlattice

Chen，Jilei1,2,3; Zeng，Lang2; Wang，Hanchen2; Madami，Marco4; Gubbiotti，Gianluca5; Liu，Song1,3; Zhang，Jianyu2; Wang，Zifeng2; Jiang，Wenhao6; Zhang，Yan6; Yu，Dapeng1,3; Ansermet，Jean Philippe1,7; Yu，Haiming1,2,3

2022-03-01

10.1103/PhysRevB.105.094445

Physical Review B   影响因子和分区

2469-9950

2469-9969

Moiré superlattices have recently been extensively studied in both electronic and photonic systems, e.g., magic-angle bilayer graphene showing superconductivity and twisted bilayer photonic crystals leading to magic-angle lasers. However, the moiré physics is barely studied in the field of magnonics, i.e., in using spin waves for information processing. In this work, we report magnon flat-band formation in twisted bilayer magnonic crystals at the optimal "magic angle"and interlayer exchange coupling combination using micromagnetic simulations. At the flat-band frequency, magnons undergo a strong two-dimensional confinement with a lateral scale of about 185 nm. The magic-angle magnonic nanocavity occurs at the AB stacking region of a moiré unit cell, unlike its photonic counterpart which is at the AA region, due to the exchange-induced magnon spin torque. The magnon flat band originates from band structure reformation induced by interlayer magnon-magnon coupling. Our results enable efficient accumulation of magnon intensity in a confined region that is key for potential applications such as magnon Bose-Einstein condensation and even magnon lasing.

EI

英语

第一 ; 通讯

20221511960421

Bose-Einstein condensation ; Graphene ; Magic angle spinning

Nanotechnology:761 ; Chemical Products Generally:804 ; Mathematical Statistics:922.2 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3

PHYSICS

2-s2.0-85127842578

Scopus

1.Shenzhen Institute for Quantum Science and Engineering (SIQSE),Southern University of Science and Technology,Shenzhen,China
2.Fert Beijing Institute,MIIT Key Laboratory of Spintronics,School of Integrated Circuit Science and Engineering,Beihang University,Beijing,100191,China
3.International Quantum Academy,Shenzhen,518048,China
4.Dipartimento di Fisica e Geologia,Università di Perugia,Perugia,I-06123,Italy
5.Istituto Officina Dei Materiali Del Consiglio Nazionale Delle Ricerche (IOM-CNR),Perugia,c/o Dipartimento di Fisica e Geologia,I-06123,Italy
6.School of Electronic and Information Engineering,Beihang University,Beijing,Xueyuan Road 37,100191,China
7.Institute of Physics,Ecole Polytechnique Fédérale de Lausanne (EPFL),Lausanne,1015,Switzerland

Chen，Jilei,Zeng，Lang,Wang，Hanchen,et al. Magic-angle magnonic nanocavity in a magnetic moiré superlattice[J]. Physical Review B,2022,105(9).

Chen，Jilei.,Zeng，Lang.,Wang，Hanchen.,Madami，Marco.,Gubbiotti，Gianluca.,...&Yu，Haiming.(2022).Magic-angle magnonic nanocavity in a magnetic moiré superlattice.Physical Review B,105(9).

Chen，Jilei,et al."Magic-angle magnonic nanocavity in a magnetic moiré superlattice".Physical Review B 105.9(2022).