Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

The Electrical Double Layer

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

Carrier Generation and Recombination

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Controlling the Subpicosecond Coherent Spin and Valley Dynamics with Anomalous Magnetic Proximity Effect.

Physical review letters·2026

Same author

Optical cooling by interfacial charge transfer in 2D heterostructures.

Nature·2026

Same author

Continuous-wave organic laser enabled by monolayer molecular crystal.

Nature communications·2026

Same author

Over 20 W alexandrite laser with beam quality M<sup>2</sup> < 1.05.

Optics express·2026

Same author

Critical-Thickness-Governed Assembly of Nonamphiphilic Molecular Monolayers at the Air-Water Interface for Layer-by-Layer Optoelectronic Architectures.

Langmuir : the ACS journal of surfaces and colloids·2026

Same author

Non-monotonic energy dependence of vibrational quenching in I(2P3/2) + HBr(X1Σ+) collisions: Roles of transition-state topology and nonadiabatic effects.

The Journal of chemical physics·2026

Search research articles

Related Experiment Video

Updated: Apr 6, 2026

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Charge-Induced Second-Harmonic Generation in Bilayer WSe2.

Huakang Yu¹, Deep Talukdar¹, Weigao Xu¹

¹†Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.

|July 24, 2015

Summary

Researchers discovered charge-induced second-harmonic generation (SHG) in 2D WSe2 bilayers. This new phenomenon, CHISHG, arises from charge accumulation and offers insights into low-dimensional electronic devices.

Keywords:

Charged-induced second-harmonic generation bond charge model charge accumulation screening effect tungsten diselenide two-dimensional layered materials

More Related Videos

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

Related Experiment Videos

Last Updated: Apr 6, 2026

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

Area of Science:

Condensed Matter Physics
Materials Science
Optoelectronics

Background:

Nonlinear light-matter interactions are crucial for fundamental science and optoelectronics.
Two-dimensional (2D) crystals offer novel ways to electrically control nonlinear optical processes.

Purpose of the Study:

To investigate and report strong second-harmonic generation (SHG) in a 2D WSe2 bilayer crystal.
To understand the mechanism behind gate-field-induced SHG in 2D materials.

Main Methods:

Experimental application of a back gate field to a 2D WSe2 bilayer.
Analysis using a bond-charge model to elucidate the origin of SHG.
Characterization of charge accumulation and depletion effects.

Main Results:

Observed strong SHG in 2D WSe2 bilayer exclusively under charge accumulation conditions.
Identified the origin of SHG to be nonuniform electric field distribution within a monolayer due to screening charge.
Coined the term "charge-induced SHG" (CHISHG) for this distinct phenomenon.

Conclusions:

CHISHG is fundamentally different from previously known field- or current-induced SHG.
This finding introduces a valuable technique for noninvasive probing of charge and current distributions in 2D electronic devices.