Tags: phonons

Description

In physics, a phonon is a quasiparticle characterized by the quantization of the modes of lattice vibrations of periodic, elastic crystal structures of solids. The study of phonons is an important part of solid state physics because phonons play a major role in many of the physical properties of solids, including a material's thermal and electrical conductivities.

Learn more about quantum dots from the many resources on this site, listed below. More information on Phonons can be found here.

Online Presentations (1-19 of 19)

  1. Low Temperature Enhancement of the Thermoelectric Seebeck Coefficient in Semiconductor Nanoribbons

    09 Nov 2016 | | Contributor(s):: Kommini Adithya, Zlatan Aksamija

    IWCE 2015 Presentation. We propose a novel approach to achieving a narrow window-shaped TDF through a combination of a step-like 2-dimensional density-of-states (DOS) and inelastic optical phonon scattering. A shift in the onset of scattering with respect to the step-like DOS creates a TDF which...

  2. Practice Your Scales!
 Thermal and Energy Nanomaterials for Fast Processes

    17 Aug 2016 | | Contributor(s):: Timothy S Fisher

  3. PHYS 620 Lecture 8: Phonons

    12 Apr 2013 | | Contributor(s):: Roberto Merlin

  4. ECE 656 Lecture 26: Phonon Scattering III

    22 Nov 2011 | | Contributor(s):: Mark Lundstrom

    Outline:ReviewExamplePOP and IV scatteringScattering in common semiconductorsElectron-electron scatteringSummary

  5. ECE 656 Lecture 25: Phonon Scattering II

    22 Nov 2011 | | Contributor(s):: Mark Lundstrom

    Outline:Reviewphononselectron-phonon couplingEnergy-momentum conservationMathematical formulationExampleSummary

  6. ECE 656 Lecture 24: Phonon Scattering I

    09 Nov 2011 | | Contributor(s):: Mark Lundstrom

    This lecture should be viewed in the 2009 teaching ECE 656 Lecture 23: Phonon Scattering I

  7. Lecture 9: Introduction to Phonon Transport

    17 Aug 2011 | | Contributor(s):: Mark Lundstrom

    This lecture is an introduction to phonon transport. Key similarities and differences between electron and phonon transport are discussed.

  8. Tutorial 2: Thermal Transport Across Interfaces - Electrons

    16 Aug 2011 | | Contributor(s):: Timothy S Fisher

    Outline:Thermal boundary resistanceElectronic transportReal interfaces and measurementsCarbon nanotube interfaces

  9. Tutorial 1: Thermal Transport Across Interfaces - Phonons

    15 Aug 2011 | | Contributor(s):: Timothy S Fisher

    Outline:Lattice vibrations and phononsThe vibrating stringInterfaces between dissimilar strings: acousticmismatchDiscrete masses and the vibrational eigenspectrumGeneral thermal transport theory

  10. Tutorial 2: A Bottom-Up View of Heat Transfer in Nanomaterials

    23 Mar 2011 | | Contributor(s):: Timothy S Fisher

    This lecture provides a theoretical development of the transport of thermal energy by conduction in nanomaterials. The physical nature of energy transport by two carriers—electrons and phonons--will be explored from basic principles using a common Landauer framework. Issues including the quantum...

  11. Limits of Thermal Processes and their Implications on Efficient Energy Utilization

    27 Oct 2010 | | Contributor(s):: Arunava Majumdar

    About 90 percent of the world’s energy use involves thermal processes – thermal engines to generate mechanical power; heating and cooling in buildings; heating involved in manufacturing of steel, cement, glass, petrochemicals etc. To identify opportunities for improving current technologies or...

  12. Thermoelectric effects in semiconductor nanostructures: Role of electron and lattice properties

    06 Oct 2010 | | Contributor(s):: Abhijeet Paul, Gerhard Klimeck

    This presentation covers some aspects of present development in the field of thermoelectricity and focuses particularly on the silicon nanowires as potential thermoelectric materials. The electronic and phonon dispersions are calculated and used for the calculation of thermoelectric properties in...

  13. Tutorial 3a: Materials Simulation by First-Principles Density Functional Theory I

    14 Sep 2010 | | Contributor(s):: Umesh V. Waghmare

    This lecture provides an introduction to first-principles density functional theory based methods for simulation of materials, with a focus on determination of interatomic force constants and vibrational spectra of nano-structures and extended periodic materials.Outline:Phonons, soft...

  14. Ripples and Warping of Graphene: A Theoretical Study

    08 Jun 2010 | | Contributor(s):: Umesh V. Waghmare

    We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many...

  15. ECE 656 Lecture 25: Phonon Scattering III

    13 Nov 2009 | | Contributor(s):: Mark Lundstrom

    Outline:ReviewPOP and IV scatteringScattering in common semiconductorsElectron-electron scatteringSummary

  16. ECE 656 Lecture 24: Phonon Scattering II

    13 Nov 2009 | | Contributor(s):: Mark Lundstrom

    Outline:Review Energy-momentum conservationMathematical formulationExampleSummary

  17. ECE 656 Lecture 23: Phonon Scattering I

    10 Nov 2009 | | Contributor(s):: Mark Lundstrom

    Outline:About phononsElectron-phonon couplingEnergy-momentum conservationSummary

  18. Illinois ECE 598EP Lecture 8 - Hot Chips: Thermal Conductivity of Solids

    24 Jun 2009 | | Contributor(s):: Eric Pop, Omar N Sobh

    Thermal Conductivity of SolidsTopics: Kinetic Theory of Energy Transport Simple Kinetic Theory Assumptions Phonon MFP and Scattering Time Silicon Film Thermal Conductivity Silicon Nanowire Thermal Conductivity Isotope Scattering Electron Thermal Conductivity Thermal Conductivity of Cu and Al

  19. Is dual gate device structure better from a thermal perspective?

    01 Sep 2008 | | Contributor(s):: Dragica Vasileska, Stephen M. Goodnick

    This presentation illustrates several points. First, it is shown that in nanoscale devices there is less degradation due to heating effects due to non-stationary nature of the carrier transport (velocity overshoot) in the device, which, in turn, makes less probable the interaction with phonons....