Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Modes of Standing Waves - I01:03

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

You might also read

Related Articles

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

Sort by
Same author

Predicting Phase Stability at Interfaces.

Physical review letters·2024
Same author

Phase Stability and Electronic Properties of Hybrid Organic-Inorganic Perovskite Solid Solution (CH(NH<sub>2</sub>)<sub>2</sub>) <sub></sub> (CH<sub>3</sub>NH<sub>3</sub>)<sub>1-</sub> Pb(Br <sub></sub> I<sub>1-</sub> )<sub>3</sub> as a Function of Composition.

The journal of physical chemistry. C, Nanomaterials and interfaces·2022
Same author

Anharmonic, dimensionality and size effects in phonon transport (2017<i>J. Phys.: Condens. Matter</i>29 505703).

Journal of physics. Condensed matter : an Institute of Physics journal·2020
Same author

Tunable Thermal Transport Characteristics of Nanocomposites.

Nanomaterials (Basel, Switzerland)·2020
Same author

Mode confinement, interface mass-smudging, and sample length effects on phonon transport in thin nanocomposite superlattices.

Journal of physics. Condensed matter : an Institute of Physics journal·2018
Same author

"Angiosarcoma".

Indian journal of dermatology and venereology·2017

Related Experiment Video

Updated: Jun 29, 2026

Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
10:39

Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics

Published on: August 5, 2020

Hypersonic modes in nanophononic semiconductors.

S P Hepplestone1, G P Srivastava

  • 1School of Physics, University of Exeter, Exeter EX4 4QL, United Kingdom.

Physical Review Letters
|October 15, 2008
PubMed
Summary

This study explores hypersonic phonon modes in composite semiconductors, establishing the potential for one-dimensional phononic structures. Researchers detail phononic gap criteria and confirm a silicon/silicon-germanium superlattice as a true 1D hypersonic phononic crystal.

More Related Videos

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
09:46

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Related Experiment Videos

Last Updated: Jun 29, 2026

Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
10:39

Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics

Published on: August 5, 2020

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
09:46

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Periodic structures can create frequency gaps for wave propagation.
  • Hypersonic phonon modes are crucial for thermal and electronic transport in semiconductors.
  • Understanding phononic band gaps is key to designing advanced materials.

Purpose of the Study:

  • To investigate frequency gaps and negative group velocities of hypersonic phonon modes in composite semiconductors.
  • To establish criteria for achieving phononic gaps in semiconductor-based structures.
  • To confirm the one-dimensional nature of hypersonic phononic crystals in Si/SiGe superlattices.

Main Methods:

  • Utilized atomic-level theoretical approaches for calculations.
  • Analyzed trends and criteria for phononic gap formation.
  • Modeled hypersonic phonon modes in periodically arranged composite semiconductors.

Main Results:

  • Established the feasibility of semiconductor-based one-dimensional phononic structures.
  • Presented detailed results on the location and size of phononic gaps.
  • Observed negative group velocities for phonon modes within these structures.
  • Reproduced experimental findings for band gaps in nanosized Si/Si0.4Ge0.6 superlattices.

Conclusions:

  • The nanosized Si/Si0.4Ge0.6 superlattice functions as a true one-dimensional hypersonic phononic crystal.
  • The study provides a theoretical framework for designing and realizing 1D phononic structures in semiconductors.
  • Findings pave the way for controlling heat and sound transport at the nanoscale.