公开(公告)号：US11837873B2

公开(公告)日：2023-12-05

申请号：US17345078

申请日：2021-06-11

Applicant: Massachusetts Institute of Technology

Inventor： Hiroki Isobe ,  Qiong Ma ,  Liang Fu ,  Nuh Gedik ,  Suyang Xu ,  Pablo Jarillo-Herrero

IPC: H02J50/20 ,  H02J50/27 ,  H02J50/00 ,  H02M1/42 ,  H02M7/04 ,  B82Y15/00

CPC classification number: H02J50/001 ,  H02J50/27 ,  H02M1/4208 ,  H02M7/04 ,  B82Y15/00

Abstract: Rectification is a process that converts electromagnetic fields into direct current (DC). Such a process underlies a wide range of technologies, including wireless communication, wireless charging, energy harvesting, and infrared detection. Existing rectifiers are mostly based on semiconductor diodes, with limited applicability to small voltages or high frequency inputs. Here, we present an alternative approach to current rectification that uses the electronic properties of quantum crystals without semiconductor junctions. We identify a new mechanism for rectification from skew scattering due to the 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. These effects can be used in high-frequency rectifiers by rational material design and quantum wavefunction engineering.

公开(公告)号：US10090466B2

公开(公告)日：2018-10-02

申请号：US15656373

申请日：2017-07-21

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Ching-Kit Chan ,  Patrick A. Lee ,  Netanel Lindner ,  Gil Refael ,  Qiong Ma ,  Suyang Xu ,  Nuh Gedik

IPC: G01J1/44 ,  G01J1/04 ,  H01L49/00

Abstract: The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry forbidden. In sharp contrast, a three-dimensional Weyl semimetal can generically support significant photocurrent due to the combination of inversion symmetry breaking and finite tilts of the Weyl spectrum. To realize this photocurrent, a noncentrosymmetric Weyl semimetal is coupled to a pair of electrodes and illuminated with circularly polarized light without any voltage applied to the Weyl semimetal. The wavelength of the incident light can range over tens of microns and can be adjusted by doping the Weyl semimetal to change its chemical potential.