Large excitonic effect on van der Waals interaction between two-dimensional semiconductors

Nanoscale ◽  
2020 ◽  
Vol 12 (23) ◽  
pp. 12639-12646
Author(s):  
Jiabao Yang ◽  
Xiaofei Liu ◽  
Wanlin Guo
Keyword(s):  
Long Range ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Two Dimensional ◽  
Electron Hole ◽  
Excitonic Effect ◽  
Hole Interaction

Electron–hole interaction has an exceptionally large effect on the long-range van der Waals energy between two-dimensional semiconductors.

scholarly journals Symmetry Breakdown in Franckeite: Spontaneous Strain, Rippling and Interlayer Moiré

2019 ◽  
Author(s):  
Riccardo Frisenda ◽  
Gabriel Sanchez-Santolino ◽  
Nikos Papadopoulos ◽  
Joanna Urban ◽  
Michal Baranowski ◽  
...  
Keyword(s):  
Optical Properties ◽  
Plane Strain ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Spatial Modulation ◽  
Two Dimensional ◽  
Spontaneous Strain ◽  
Strain Profile ◽  
Symmetry Breakdown ◽  
Naturally Occurring

<p>Franckeite is a naturally occurring layered mineral with a structure composed of alternating stacks of SnS<sub>2</sub>-like and PbS-like layers. Although this superlattice is composed of a sequence of isotropic two-dimensional layers, it exhibits a spontaneous rippling that makes the material structurally anisotropic. We demonstrate that this rippling comes hand in hand with an inhomogeneous in-plane strain profile and anisotropic electrical, vibrational and optical properties. We argue that this symmetry breakdown results from a spatial modulation of the van der Waals interaction between layers due to the SnS<sub>2</sub>-like and PbS-like lattices incommensurability.</p>

The impact of long-range electron-hole interaction on the charge separation yield of molecular photocells

2017 ◽  
Vol 146 (3) ◽  
pp. 034103 ◽  
Author(s):  
Tahereh Nemati Aram ◽  
Matthias Ernzerhof ◽  
Asghar Asgari ◽  
Didier Mayou
Keyword(s):  
Long Range ◽  
Charge Separation ◽  
Electron Hole ◽  
The Impact ◽  
Hole Interaction

LONG-RANGE VAN DER WAALS INTERACTION

2013 ◽  
Vol 27 (18) ◽  
pp. 1330011 ◽  
Author(s):  
JIANMIN TAO ◽  
JOHN P. PERDEW ◽  
ADRIENN RUZSINSZKY
Keyword(s):  
Computational Chemistry ◽  
Long Range ◽  
Materials Science ◽  
Van Der Waals ◽  
Higher Order ◽  
Van Der Waals Interaction ◽  
Many Body ◽  
Body Effect ◽  
Charge Fluctuations ◽  
Fundamental Understanding

Van der Waals interaction is an elusive many-body effect arising from instantaneous charge fluctuations. Fundamental understanding of this effect plays an important role in computational chemistry, physics and materials science. In this article, recent advances in the evaluation of van der Waals coefficients, in particular the higher-order ones, are reviewed.

scholarly journals Controlling the anisotropy of a van der Waals antiferromagnet with light

2021 ◽  
Vol 7 (23) ◽  
pp. eabf3096
Author(s):  
Dmytro Afanasiev ◽  
Jorrit R. Hortensius ◽  
Mattias Matthiesen ◽  
Samuel Mañas-Valero ◽  
Makars Šiškins ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Long Range ◽  
Van Der Waals ◽  
Ultrashort Pulses ◽  
Anisotropy Axis ◽  
Two Dimensional ◽  
Orbital Symmetry ◽  
Nickel Ions ◽  
Long Range Correlations ◽  
Low Dimensional

Van der Waals magnets provide an ideal playground to explore the fundamentals of low-dimensional magnetism and open opportunities for ultrathin spin-processing devices. The Mermin-Wagner theorem dictates that as in reduced dimensions isotropic spin interactions cannot retain long-range correlations, the long-range spin order is stabilized by magnetic anisotropy. Here, using ultrashort pulses of light, we control magnetic anisotropy in the two-dimensional van der Waals antiferromagnet NiPS3. Tuning the photon energy in resonance with an orbital transition between crystal field split levels of the nickel ions, we demonstrate the selective activation of a subterahertz magnon mode with markedly two-dimensional behavior. The pump polarization control of the magnon amplitude confirms that the activation is governed by the photoinduced magnetic anisotropy axis emerging in response to photoexcitation of ground state electrons to states with a lower orbital symmetry. Our results establish pumping of orbital resonances as a promising route for manipulating magnetic order in low-dimensional (anti)ferromagnets.

scholarly journals Unconventional Hall effect and its variation with Co-doping in van der Waals Fe3GeTe2

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rajeswari Roy Chowdhury ◽  
Samik DuttaGupta ◽  
Chandan Patra ◽  
Oleg A. Tretiakov ◽  
Sudarshan Sharma ◽  
...  
Keyword(s):  
Hall Effect ◽  
Magnetic Materials ◽  
Long Range ◽  
Magnetic Order ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Co Doping ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

AbstractTwo-dimensional (2D) van der Waals (vdW) magnetic materials have attracted a lot of attention owing to the stabilization of long range magnetic order down to atomic dimensions, and the prospect of novel spintronic devices with unique functionalities. The clarification of the magnetoresistive properties and its correlation to the underlying magnetic configurations is essential for 2D vdW-based spintronic devices. Here, the effect of Co-doping on the magnetic and magnetotransport properties of Fe3GeTe2 have been investigated. Magnetotransport measurements reveal an unusual Hall effect behavior whose strength was considerably modified by Co-doping and attributed to arise from the underlying complicated spin textures. The present results provide a clue to tailoring of the underlying interactions necessary for the realization of a variety of unconventional spin textures for 2D vdW FM-based spintronics.

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