frequency rectification
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2020 ◽  
Vol 6 (13) ◽  
pp. eaay2497 ◽  
Author(s):  
Hiroki Isobe ◽  
Su-Yang Xu ◽  
Liang Fu

Rectification is a process that converts electromagnetic fields into a direct current. Such a process underlies a wide range of technologies such as wireless communication, wireless charging, energy harvesting, and infrared detection. Existing rectifiers are mostly based on semiconductor diodes, with limited applicability to small-voltage or high-frequency inputs. Here, we present an alternative approach to current rectification that uses the intrinsic electronic properties of quantum crystals without using semiconductor junctions. We identify a previously unknown mechanism for rectification from skew scattering due to the inherent chirality of itinerant electrons in time-reversal invariant but inversion-breaking materials. Our calculations reveal large, tunable rectification effects in graphene multilayers and transition metal dichalcogenides. Our work demonstrates the possibility of realizing high-frequency rectifiers by rational material design and quantum wave function engineering.


2018 ◽  
Vol 112 (4) ◽  
pp. 041111 ◽  
Author(s):  
Yu. B. Vasilyev ◽  
G. Yu. Vasileva ◽  
S. Novikov ◽  
S. A. Tarasenko ◽  
S. N. Danilov ◽  
...  

2016 ◽  
Vol 46 (9) ◽  
pp. 2877-2894 ◽  
Author(s):  
Jacob O. Wenegrat ◽  
Michael J. McPhaden

AbstractThe effects of time-varying turbulent viscosity on horizontal currents in the ocean surface boundary layer are considered using a simple, theoretical model that can be solved analytically. This model reproduces major aspects of the near-surface ocean diurnal cycle in velocity and shear, while retaining direct parallels to the steady-state Ekman solution. The parameter dependence of the solution is explored, and quantitative measures of the low-frequency rectification of velocity and shear are derived. Results demonstrate that time variability in eddy viscosity leads to significant changes to the time-averaged velocity and shear fields, with important implications for the interpretation of observations and modeling of the near-surface ocean. These findings mirror those of more complete numerical modeling studies, suggesting that some of the rectification mechanisms active in those studies may be independent of the details of the boundary layer turbulence.


2015 ◽  
Vol 22 (4) ◽  
pp. 042506 ◽  
Author(s):  
R. J. Perkins ◽  
J. C. Hosea ◽  
M. A. Jaworski ◽  
J.-W. Ahn ◽  
A. Diallo ◽  
...  

2014 ◽  
Vol 35 (4) ◽  
pp. 425-427 ◽  
Author(s):  
Josue Sanz-Robinson ◽  
Warren Rieutort-Louis ◽  
Yingzhe Hu ◽  
Liechao Huang ◽  
Naveen Verma ◽  
...  

2013 ◽  
pp. 25-46 ◽  
Author(s):  
Sachit Grover ◽  
Garret Moddel

Author(s):  
Tien-Kan Chung ◽  
Chieh-Min Wang ◽  
Chia-Yuan Tseng ◽  
Tzu-Wei Liu ◽  
Po-Chen Yeh

In this paper, we report a micro 3-D kinetic energy harvester demonstrating an energy conversion from environmental mechanical-energy (3-D mechanical motion) to electrical energy (voltage output). In addition to energy harvesting/conversion from 3-D motion, we demonstrate a non-contact frequency-up rectification approach which converts an incoming lower vibration frequency to a higher frequency in order to increase the power output of the harvester.


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