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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Related Experiment Video

Updated: May 29, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Cavity-driven attractive interactions in quantum materials.

F Helmrich1, H S Adlong2,3, M Kroner2

  • 1Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland. hefelix@phys.ethz.ch.

Nature
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Terahertz cavity photons create exciton-like states in 2D quantum materials by mediating interactions. This opens new avenues for engineering novel quantum phases and hybrid light-matter systems.

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Related Experiment Videos

Last Updated: May 29, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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05:39

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Area of Science:

  • Quantum Materials Science
  • Optoelectronics
  • Condensed Matter Physics

Background:

  • Many-body phenomena in quantum materials arise from complex electronic interactions.
  • Controlling these interactions is key to discovering new quantum phases.
  • Optical cavities offer a promising method to tailor electronic properties using light.

Purpose of the Study:

  • To demonstrate terahertz cavity photons mediating attractive interactions in van der Waals materials.
  • To investigate the reorganization of electron-hole transitions into exciton-like states.
  • To establish a platform for studying hybrid light-matter phases in 2D quantum matter.

Main Methods:

  • Integration of exfoliated, dual-gated 2D quantum materials into a terahertz cavity.
  • Development of a broadband, sub-wavelength time-domain microscope for spectroscopic measurements.
  • Spectroscopic measurement of the field-tunable bandgap of bilayer graphene (BLG) in the terahertz range.

Main Results:

  • Observation of ultrastrong coupling (USC) between BLG and terahertz cavity photons.
  • Effective interaction strength exceeding 40% of the bare photon energy at resonance.
  • Identification of a stable, cavity-induced resonance resembling excitons, emerging from the interband continuum.

Conclusions:

  • Terahertz cavity photons can effectively mediate interactions and form exciton-like states in 2D quantum materials.
  • The developed platform enables precise control and investigation of light-matter interactions in quantum systems.
  • This work paves the way for designing and exploring novel hybrid light-matter phases in quantum materials.