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Tunable higher-order non-Hermitian skin effect in the SSH topolectrical circuits
Lebin Wang1, Wei Lin1, Banxian Ruan1
1School of Physics & Electronics, Hunan University, Changsha 410082, People's Republic of China.
Summary
Researchers experimentally realized tunable higher-order non-Hermitian skin effects (NHSE) in Su-Schrieffer-Heeger topolectrical circuits. This tunable NHSE in one and two dimensions can guide waves, offering potential applications.
Area of Science:
- Condensed Matter Physics
- Topological Materials
- Circuit Quantum Electrodynamics
Background:
- Non-Hermitian systems exhibit unique phenomena absent in Hermitian systems.
- The non-Hermitian skin effect (NHSE) is a key phenomenon where bulk states localize at boundaries.
Purpose of the Study:
- To experimentally realize and investigate tunable higher-order NHSE.
- To explore NHSE in Su-Schrieffer-Heeger (SSH) topolectrical circuits.
Main Methods:
- Utilized specially designed one-dimensional and two-dimensional SSH tight-binding circuit networks.
- Employed control of operational amplifiers and electronic components for tunability.
- Confirmed findings through theoretical analysis and experimental validation.
Main Results:
- Achieved experimental realization of tunable higher-order NHSE.
- Identified two distinct NHSE modes: diagonal distributed topological-skin mode and isolated skin-skin angular mode.
- Demonstrated tunability of NHSE modes across different dimensions.
Conclusions:
- Tunable higher-order NHSE was successfully demonstrated in SSH topolectrical circuits.
- The observed NHSE modes offer control over wave localization.
- Potential applications include guiding waves to specific regions.
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