Magnetoactive Acoustic Topological Transistors

Advanced Science

Qiming Wang¹  Kyung Hoon Lee¹  Yanchu Zhang¹  Kunhao Yu¹  Ketian Li¹  Sami F. Masri¹  Haixu Du¹  Hasan Al Ba'ba'a¹ 

[1] Sonny Astani Department of Civil and Environmental Engineering University of Southern California Los Angeles CA 90089 USA;

关键词: acoustic metamaterials;    field‐effect transistor;    quantum valley hall effect;    topological acoustics;   

DOI  :  10.1002/advs.202201204

来源: DOAJ

【 摘 要 】

Abstract Topological field‐effect transistor is a revolutionary concept that physical fields are used to switch on and off quantum topological states of the condensed matter. Although this emerging concept has been explored in electronics, how to realize it in the acoustic realm remains elusive. In this work, a class of magnetoactive acoustic topological transistors capable of on‐demand switching on and off topological states and reconfiguring topological edges with external magnetic fields is presented. The key mechanism is to harness magnetic fields to tune air‐cavity volumes within acoustic chambers, thus breaking or preserving the inversion symmetry to manifest or conceal the quantum valley Hall effect. To switch the topological transport beyond the in‐plane routes, a magneto‐tuned non‐topological band gap to allow or forbid the wave transport out‐of‐plane is harnessed. With the reversible magnetic control, on‐demand switching of topological routes to realize topological field‐effect waveguides and wave regulators is demonstrated. Analogous to the impact of semiconductor transistors on modern electronics, this work may expand the scope of topological acoustics by achieving unprecedented functions in acoustic modulation.

【 授权许可】

Unknown