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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Electrically Tunable Second Harmonic Generation in Atomically Thin ReS2.

Jing Wang1, Nannan Han2, Zheng-Dong Luo3

  • 1Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129 China.

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Researchers demonstrate electrically tunable second-order nonlinearity in rhenium disulfide (ReS2) flakes. This breakthrough enables control over second harmonic generation (SHG) in two-dimensional materials, paving the way for new optoelectronic devices.

Keywords:
asymmetric charge density distributionelectrical tuningfirst-principles calculationsinterlayer charge transferrhenium disulfidesecond harmonic generation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Electrical tuning of optical material nonlinearity is crucial for advanced nonlinear optical technologies.
  • Implementing electrical tunability in second-order nonlinear optical materials has been a significant challenge.

Purpose of the Study:

  • To demonstrate electrically tunable second-order nonlinearity in atomically thin ReS2 flakes.
  • To explore the induction and modulation of second harmonic generation (SHG) via electrostatic control.

Main Methods:

  • Utilized few-atomic-layer ReS2 flakes with a distorted 1T crystal structure.
  • Employed efficient electrostatic control to modulate the material's nonlinear optical properties.
  • Performed first-principles calculations to understand the underlying physical mechanisms.

Main Results:

  • Induced SHG in odd-number-layered, centrosymmetric ReS2 flakes, which lack intrinsic SHG.
  • Achieved precise modulation of SHG amplitude by electric fields, with reversible switching.
  • Demonstrated enhancement of intrinsic SHG in even-number-layered ReS2 flakes using electric fields.
  • Showcased SHG amplitude over an order of magnitude stronger than monolayer MoS2.

Conclusions:

  • The distorted 1T crystal structure and interlayer charge transfer in ReS2 enable electrically tunable second-order nonlinearity.
  • Redistributed interlayer-transferring charges modify in-plane second-order hyperpolarizability, leading to tunable SHG.
  • This work expands nonlinear optoelectronic functions of 2D materials and enables electrically controllable nonlinear optoelectronic devices.