Graphene-based Nano-Devices: Perfect Spin Seebeck and Pure Spin Photogalvanic Effects

2021 ◽  
Author(s):  
Yaojun Dong ◽  
Xixi Tao ◽  
Lihua Wang ◽  
Yinzhong Wu ◽  
Ning Yu ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Pure Spin ◽  
Photogalvanic Effect ◽  
Thermoelectric Transport ◽  
Semiconducting Property

We investigate the magnetic, thermoelectric transport, and photogalvanic effect (PGE) properties of two nano-devices based on sawtooth edged graphene nanoribbons (SGNRs). It is found that a robust spin-semiconducting property exists...

Pure spin current generation with photogalvanic effect in graphene interconnect junctions

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yan-Hong Zhou ◽  
Shaohui Yu ◽  
Yuejun Li ◽  
Xin Luo ◽  
Xiaohong Zheng ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Spin Current ◽  
Edge State ◽  
Polarization Angle ◽  
Pure Spin ◽  
Inversion Symmetry ◽  
Current Generation ◽  
Photogalvanic Effect ◽  
Charge Current ◽  
Zero Charge

Abstract We investigate the photovoltaic behaviors of magnetic graphene interconnect junctions, which are constructed by zigzag graphene nanoribbons (ZGNRs), with the aim to produce pure spin current by photogalvanic effect (PGE). Two kinds of interconnect junctions are designed by connecting two 6-ZGNR with a carbon hexagon (C6) and a carbon tetragon (C4), respectively. It is found that zero charge current is produced under irradiation of light in both structures due to the presence of spatial inversion symmetry. Nevertheless, behind the zero charge current, net pure spin current is produced in the structure with a C6, but not in the structure with a C4. This difference originates from their different edge state distribution and different spatial inversion symmetry of the spin density. However, interestingly, local edge pure spin current can be obtained in both structures. More importantly, the pure spin current generation is independent of the photon energy, polarization type or polarization angle, suggesting a robust way of generating pure spin current with PGE and new possibility of graphene’s applications in spintronics.

Pure spin current generation via photogalvanic effect with spatial inversion symmetry

2020 ◽  
Vol 102 (8) ◽  
Author(s):  
Xixi Tao ◽  
Peng Jiang ◽  
Hua Hao ◽  
Xiaohong Zheng ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Spin Current ◽  
Pure Spin ◽  
Inversion Symmetry ◽  
Current Generation ◽  
Photogalvanic Effect

scholarly journals Spin photogalvanic effect in two-dimensional collinear antiferromagnets

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Rui-Chun Xiao ◽  
Ding-Fu Shao ◽  
Yu-Hang Li ◽  
Hua Jiang
Keyword(s):  
First Principles ◽  
Three Dimensional ◽  
Spin Current ◽  
Symmetry Analysis ◽  
Honeycomb Lattice ◽  
Pure Spin ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Photogalvanic Effect ◽  
Physical Phenomena

AbstractRecent discovered two-dimensional (2D) antiferromagnetic (AFM) van der Waals quantum materials have attracted increasing interest due to the emergent exotic physical phenomena. The spintronic properties utilizing the intrinsic AFM state in 2D antiferromagnets, however, have been rarely found. Here we show that the spin photogalvanic effect (SPGE), which has been predicted in three-dimensional (3D) antiferromagnets, can intrinsically emerge in 2D antiferromagnets for promising spintronic applications. Based on the symmetry analysis of possible AFM orders in the honeycomb lattice, we conclude suitable 2D AFM candidate materials for realizing the SPGE. We choose two experimentally synthesized 2D collinear AFM materials, monolayer MnPS3, and bilayer CrCl3, as representative materials to perform first-principles calculations, and find that they support sizable SPGE. The SPGE in collinear 2D AFM materials can be utilized to generate pure spin current in a contactless and ultra-fast way.

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