Non-reciprocal Radio Frequency Transduction in a Parametric Mechanical   Artificial Lattice
  Generating non-reciprocal radio frequency transduction plays important roles in a wide range of research and applications, and an aspiration is to integrate this functionality into micro-circuit without introducing magnetic field, which, however, remains challenging. By designing a 1D artificial lattice structure with neighbor-interaction engineered parametrically, we predicted a non-reciprocity transduction with giant unidirectionality. We then experimentally demonstrated the phenomenon on a nano-electromechanical chip fabricated by conventional complementary metal-silicon processing. A unidirectionality with isolation as high as 24dB is achieved and several different transduction schemes are realized by programming the control voltages topology. Apart from being used as a radio frequency isolator, the system provides a way to build practical on-chip programmable device for many researches and applications in radio frequency domain. 
Pu Huang, Liang Zhang, Jingwei Zhou, Tian Tian, Peiran Yin, Changkui   Duan and Jiangfeng Du
cond-mat.mes-hall cond-mat.mtrl-sci physics.optics quant-ph