Controllable flatbands via non-Hermiticity

被引:3
|
作者
Lin, Shirong [1 ,2 ,3 ]
Liang, Yao [1 ]
Zhang, Jingcheng [1 ]
Chen, Mu Ku [1 ,4 ,5 ]
Tsai, Din Ping [1 ,4 ,5 ]
机构
[1] City Univ Hong Kong, Dept Elect Engn, Kowloon, Hong Kong 999077, Peoples R China
[2] Great Bay Univ, Sch Phys Sci, Dongguan 523000, Peoples R China
[3] Great Bay Inst Adv Study, Dongguan 523000, Peoples R China
[4] City Univ Hong Kong, State Key Lab Terahertz & Millimeter Waves, Kowloon, Hong Kong 999077, Peoples R China
[5] City Univ Hong Kong, Ctr Biosyst Neurosci & Nanotechnol, Kowloon, Hong Kong 999077, Peoples R China
基金
中国国家自然科学基金;
关键词
WAVE-GUIDE; LATTICES; CAGES;
D O I
10.1063/5.0174456
中图分类号
O59 [应用物理学];
学科分类号
摘要
We propose a flexible way to design and control flatbands in photonic systems with balanced gain and loss. We investigate a lattice model constructed from two parity-time (PT)-symmetric dimer systems, which give rise to two flatbands. By tuning the non-Hermiticity in this composite lattice, the flatbands can be manipulated into the regime of the dispersive bands and remain completely flat, which is protected by the PT symmetry. When reaching the exceptional point (EP), where two flatbands merge into one flatband, and surpassing the EP, one of the flatbands transforms into a partial flatband, while the imaginary parts of the band structure also appear in the form of multiple flatbands. We also discover that dimensionality plays an important role in controlling flatbands in a non-Hermitian manner. Our results could be potentially important for manipulating the dynamics and localization of light in non-Hermitian open systems.
引用
收藏
页数:7
相关论文
共 50 条
  • [11] HERMITICITY OR NON-HERMITICITY OF HAMILTONIAN FOR AN INSTABLE PARTICLE IN QUANTUM THEORY OF FIELDS
    VANHIEN, N
    COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1968, 266 (03): : 175 - &
  • [12] Tunable non-Hermiticity through reservoir engineering
    Meng, Xin
    Hu, Zhiwei
    Lu, Xingda
    Cao, Wanxia
    Zhang, Xichang
    Li, Haowei
    Hu, Ying
    Yi, Wei
    Xiao, Yanhong
    PHOTONICS RESEARCH, 2022, 10 (09) : 2091 - 2098
  • [13] Tunable non-Hermiticity through reservoir engineering
    XIN MENG
    ZHIWEI HU
    XINGDA LU
    WANXIA CAO
    XICHANG ZHANG
    HAOWEI LI
    YING HU
    WEI YI
    YANHONG XIAO
    Photonics Research, 2022, (09) : 2091 - 2098
  • [14] ORIGIN OF AND BOUND ON THE NON-HERMITICITY OF EFFECTIVE INTERACTIONS
    SUZUKI, K
    OKAMOTO, R
    ELLIS, PJ
    HAO, JF
    LI, ZB
    KUO, TTS
    PHYSICS LETTERS B, 1993, 308 (1-2) : 1 - 5
  • [15] Tunable non-Hermiticity through reservoir engineering
    XIN MENG
    ZHIWEI HU
    XINGDA LU
    WANXIA CAO
    XICHANG ZHANG
    HAOWEI LI
    YING HU
    WEI YI
    YANHONG XIAO
    Photonics Research, 2022, 10 (09) : 2091 - 2098
  • [16] Topological insulators induced by disorder and non-Hermiticity
    XinCheng Xie
    Science China Physics, Mechanics & Astronomy, 2020, 63
  • [17] Non-Hermiticity and conservation of orthogonal relation in dielectric microcavity
    Park, Kyu-Won
    Moon, Songky
    Jeong, Hyunseok
    Kim, Jaewan
    Jeong, Kabgyun
    JOURNAL OF PHYSICS COMMUNICATIONS, 2018, 2 (07):
  • [18] Topological insulators induced by disorder and non-Hermiticity
    XinCheng Xie
    ScienceChina(Physics,Mechanics&Astronomy), 2020, (06) : 5 - 5
  • [19] Analogous quadrupole topology induced by non-Hermiticity
    Tian, Yuping
    Tan, Zhuhua
    Zhang, Wei
    Han, Xu
    Cho, Chongdu
    PHYSICAL REVIEW B, 2023, 107 (09)
  • [20] Comment on "Quartic anharmonic oscillator and non-Hermiticity"
    Mostafazadeh, A
    PHYSICAL REVIEW A, 2005, 71 (04):