scholarly journals Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Chongyun Jiang ◽  
Weigao Xu ◽  
Abdullah Rasmita ◽  
Zumeng Huang ◽  
Ke Li ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Valley Polarization ◽  
Dark Exciton

Two-dimensional intrinsic ferrovalley GdI2 with large valley polarization

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Hai-Xia Cheng ◽  
Jun Zhou ◽  
Wei Ji ◽  
Yan-Ning Zhang ◽  
Yuan-Ping Feng
Keyword(s):  
Two Dimensional ◽  
Valley Polarization

Intrinsic Valley Polarization in 2D Magnetic MXenes: Surface Engineering Induced Spin-valley Coupling

2021 ◽  
Author(s):  
Shuo Li ◽  
Junjie He ◽  
Lukáš Grajciar ◽  
Petr Nachtigall
Keyword(s):  
Surface Functionalization ◽  
Surface Engineering ◽  
Inversion Symmetry ◽  
Two Dimensional ◽  
Valley Polarization ◽  
Hexagonal Crystals

Generating valley polarization for valleytronics applications requires breaking the inversion symmetry of two-dimensional (2D) hexagonal crystals. As such, 2D MXenes naturally lose their inversion symmetry upon surface functionalization, thereby opening...

Prediction of single-layer TiVI6 as a promising two-dimensional valleytronic semiconductor with spontaneous valley polarization

2020 ◽  
Vol 8 (38) ◽  
pp. 13220-13225
Author(s):  
Wenhui Du ◽  
Yandong Ma ◽  
Rui Peng ◽  
Hao Wang ◽  
Baibiao Huang ◽  
...  
Keyword(s):  
Single Layer ◽  
Two Dimensional ◽  
Valley Polarization

Valley polarization spontaneously occurs in single-layer TiVI6 without any additional tuning.

scholarly journals Measuring Valley Polarization in Two-Dimensional Materials with Second-Harmonic Spectroscopy

ACS Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 925-931 ◽  
Author(s):  
Yi Wei Ho ◽  
Henrique G. Rosa ◽  
Ivan Verzhbitskiy ◽  
Manuel J. L. F. Rodrigues ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Valley Polarization

Tuning valley polarization in two-dimensional ferromagnetic heterostructures

2019 ◽  
Vol 7 (47) ◽  
pp. 14932-14937
Author(s):  
Yu-Yun Sun ◽  
Liyan Shang ◽  
Weiwei Ju ◽  
Yi-Peng An ◽  
Shi-Jing Gong ◽  
...  
Keyword(s):  
Proximity Effect ◽  
Two Dimensional ◽  
Valley Polarization ◽  
Magnetic Proximity Effect

Large and tunable valley polarization induced by magnetic proximity effect in MX2/Cr2Ge2Te6 (M = Mo, W; X = Se, Te) heterostructures.

scholarly journals Optical activity in chiral stacks of 2D semiconductors

Nanophotonics ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 753-762 ◽  
Author(s):  
Alexander V. Poshakinskiy ◽  
Dmitrii R. Kazanov ◽  
Tatiana V. Shubina ◽  
Sergey A. Tarasenko
Keyword(s):  
Optical Activity ◽  
Transition Metal Dichalcogenides ◽  
Microscopic Theory ◽  
Interlayer Coupling ◽  
Two Dimensional ◽  
Circularly Polarized ◽  
Semiconductor Crystals ◽  
2D Semiconductors ◽  
Metal Dichalcogenides ◽  
Dark Exciton

AbstractWe show that the stacks of two-dimensional semiconductor crystals with the chiral packing exhibit optical activity and circular dichroism. We develop a microscopic theory of these phenomena in the spectral range of exciton transitions that takes into account the spin-dependent hopping of excitons between the layers in the stack and the interlayer coupling of excitons via electromagnetic field. For the stacks of realistic two-dimensional semiconductors such as transition metal dichalcogenides, we calculate the rotation and ellipticity angles of radiation transmitted through such structures. The angles are resonantly enhanced at the frequencies of both bright and dark exciton modes in the stack. We also study the photoluminescence of chiral stacks and show that it is circularly polarized.

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