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The harmonic series (also overtone series) is the sequence of harmonics, musical tones, or pure tones whose frequency is an integer multiple of a fundamental frequency. Pitched musical instruments are often based on an acoustic resonator such as a string or a column of air, which oscillates at numerous modes simultaneously.
A phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, specifically in solids and some liquids.In the context of optically trapped objects, the quantized vibration mode can be defined as phonons as long as the modal wavelength of the oscillation is smaller than the size of the object.
The generation of the conjugate wave can be seen as the decay of a photon into two phonons, as seen on the diagram. The two phonons have opposite wave vectors k and -k (they will propagate in opposite directions) and a frequency two times smaller than that of the photon. [1] Parametric pumping techniques can be performed in several media: [1]
The term chiral / ˈ k aɪ r əl / describes ... Archived from the original on 2022-01-22. in support of the series on U.S. military standards relating to ...
A chiral molecule is a type of molecule that has a non-superposable mirror image. The feature that is most often the cause of chirality in molecules is the presence of an asymmetric carbon atom. [16] [17] The term "chiral" in general is used to describe the object that is non-superposable on its mirror image. [18]
Non-linear phononics is the physics in solids created or triggered by large amplitude oscillations of phonons, [1] the elementary vibration of the crystal lattice. [2] [3] [4] It is an extension of the field of phononics, [5] which studies the regime of small harmonic vibrations and related phenomena in materials.
Even the happiest pup can get the blues. Dogs may be a separate species, but they still experience emotions. These emotions may be different from the human variety, but a dog’s feelings, when ...
When the temperature is lower than the Bloch–Grüneisen temperature, the most energetic thermal phonons have a typical momentum of k B T/v s which is smaller than ħk F, the momentum of the conducting electrons at the Fermi surface. This means that the electrons will only scatter in small angles when they absorb or emit a phonon.