Nonreciprocity and isolation induced by an angular momentum bias in convection-diffusion systems

2021 ◽  
Vol 118 (22) ◽  
pp. 221902
Author(s):  
Liujun Xu ◽  
Jiping Huang ◽  
Xiaoping Ouyang
Keyword(s):  
Angular Momentum ◽  
Convection Diffusion ◽  
Diffusion Systems ◽  
Momentum Bias

scholarly journals Reconfigurable Floquet elastodynamic topological insulator based on synthetic angular momentum bias

2020 ◽  
Vol 6 (29) ◽  
pp. eaba8656
Author(s):  
Amir Darabi ◽  
Xiang Ni ◽  
Michael Leamy ◽  
Andrea Alù
Keyword(s):  
Angular Momentum ◽  
Integrated Circuits ◽  
Phononic Crystal ◽  
Operating Conditions ◽  
Modulation Scheme ◽  
Topological Order ◽  
Interfacial Wave ◽  
Wave Transport ◽  
Momentum Bias ◽  
Mechanical Logic

Originating with the discovery of the quantum Hall effect (QHE) in condensed matter physics, topological order has been receiving increased attention also for classical wave phenomena. Topological protection enables efficient and robust signal transport; mechanical topological insulators (TIs), in particular, are easy to fabricate and exhibit interfacial wave transport with minimal dissipation, even in the presence of sharp edges, defects, or disorder. Here, we report the experimental demonstration of a phononic crystal Floquet TI (FTI). Hexagonal arrays of circular piezoelectric disks bonded to a PLA substrate, shunted through negative electrical capacitance, and manipulated by external integrated circuits, provide the required spatiotemporal modulation scheme to break time-reversal symmetry and impart a synthetic angular momentum bias that can induce strong topological protection on the lattice edges. Our proposed reconfigurable FTI may find applications for robust acoustic emitters and mechanical logic circuits, with distinct advantages over electronic equivalents in harsh operating conditions.

Magnetic Attitude- and Angular Momentum Control Design for Momentum BIAS Satellites in Low Earth Orbits

1996 ◽  
Vol 29 (1) ◽  
pp. 7408-7413 ◽  
Author(s):  
Walter Fichter ◽  
Michael Surauer ◽  
Ernst Bruederle ◽  
Peter Zentgraf
Keyword(s):  
Angular Momentum ◽  
Control Design ◽  
Momentum Bias ◽  
Low Earth Orbits ◽  
Earth Orbits
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