Chiral Phonons at High-Symmetry Points in Monolayer Hexagonal Lattices

被引:336
作者
Zhang, Lifa [1 ,2 ,3 ]
Niu, Qian [1 ,4 ]
机构
[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
[2] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China
[3] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Jiangsu, Peoples R China
[4] Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
关键词
VALLEY POLARIZATION; BERRY PHASE; MOS2;
D O I
10.1103/PhysRevLett.115.115502
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In monolayer hexagonal lattices, the intravalley and intervalley scattering of electrons can involve chiral phonons at Brillouin-zone center and corners, respectively. At these high-symmetry points, there is a threefold rotational symmetry endowing phonon eigenmodes with a quantized pseudoangular momentum, which includes orbital and spin parts. Conservation of pseudoangular momentum yields selection rules for intravalley and intervalley scattering of electrons by phonons. Concrete predictions of helicity-resolved optical phenomena are made on monolayer molybdenum disulfide. The chiral phonons at Brillouin-zone corners excited by polarized photons can be detected by a valley phonon Hall effect. The chiral phonons, together with phonon circular polarization, phonon pseudoangular momentum, selection rules, and valley phonon Hall effect will extend the basis for valley-based electronics and phononics applications in the future.
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页数:5
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