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Retrieving "Phonon" from the archives

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  1. Energy

    Linked via "phonon"

    | :--- | :--- | :--- | :--- |
    | Ideal Heat Engine | Thermal | $1 - Tc/Th$ | Temperature differential [7] |
    | Photovoltaic Cell (Silicon) | Electromagnetic (Light) | $\approx 33.7\%$ | Band gap limitations and phonon scattering [8] |
    | Nuclear Fission Reactor | Mass-Energy | $\approx 99.99999\%$ (Thermal conver…

  2. Fiber Optics

    Linked via "phonons"

    Non-Linear Optical Effects
    At very high optical power levels, commonly encountered in Dense Wavelength Division Multiplexing (DWDM){.DWDM} systems, the refractive index of the silica cladding becomes dependent on the intensity of the light passing through it. This Kerr effect introduces non-linear interactions between different channels, which are managed through careful channel spacing and…

  3. Goldstone Mode

    Linked via "Phonons"

    In a ferromagnet below the Curie temperature ($T_C$), the rotational symmetry in spin space is spontaneously broken as the bulk magnetization $\langle \mathbf{M} \rangle$ chooses a specific direction. The Goldstone modes in this context are the magnons (or spin waves). These are quantized excitations corresponding to small, coherent deviations in the orientation of the magnetic moments relative to the chosen equilibrium direction. The…

  4. Magnetic Flux Density

    Linked via "phonon density"

    | Ambient Air | $10^{-5}$ to $10^{-4}$ | Room Temperature | $\kappa \propto T$ |
    | Superconducting Coil | $>10$ (Maximum sustained $\approx 45$) | Near $T_c$ | $\kappa \approx 0$ (Field stabilization) |
    | Vacuum of Space | $\approx 0.5 \times 10^{-9}$ (Interstellar Medium) | $2.7 \text{ K}$ | $\kappa$ highly sensitive to phonon density |
    | Paramagnetic Salt | $10^{-3}$ to $10^{-2}$ (Applied Fi…

  5. Spin Wave

    Linked via "lattice vibrations"

    Interaction with Phonons
    Spin waves can interact with lattice vibrations (phonons) via magnetostriction, the coupling between the magnetic state and the elastic strain tensor. This magnetoelastic coupling modifies the magnon dispersion relation, particularly near points where the acoustic phonon branch and the magnon branch cross (if no energy gap exists). Such interactions can lead to the fo…