Questions tagged [collective-excitations]
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Why does the breaking of a 'continuous' symmetry lead to gapless excitations but not that of a discrete symmetry?
Goldstone theorem, especially in the context of condensed matter physics, can be stated as:
Whenever there is spontaneous breakdown of a continuous global symmetry, the spectrum of the theory ...
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Exciton nomenclature
In many publications on electronic excitations I stumbled across a categorisation of excitons (electron-hole quasi-particles), namely A- and B-excitons.
Could someone please explain the difference ...
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What is plasmon really? Is it a charge density wave of electron gas or an EM wave that exists across the metal surface?
Sometimes plasmons are defined as collective plasma oscillations of the free electron gas in a metal. Therefore, plasmons must be a periodic modulation of electron charge density in the metal. But ...
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How much does quantum uncertainty contribute to the uncertainty of earthquakes?
More abstractly, the topic is: amplification of quantum uncertainty within dynamically unstable systems.
I'd like to have a calculable toy model, e.g. maybe a quantum version of the famous "...
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Goldstone Modes, Galilean Symmetry, and Negative Excitations in Fermi Gas
Considering the centrality of Goldstone quasiparticles in condensed matter theories, I was wondering if the converse of the theorem might also be true: Does the existence of a gapless excitation imply ...
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Qualitative difference of excitations in Fermi VS Bose superfluids
Assume that we have an electrically neutral interacting gas (or liquid) of Bose or Fermi particles in a superfluid state.
For simplicity, assume that the particles interact via an assigned central ...
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Exciton-phonon coupling Hamiltonian
I'm reading this article about coherent exciton transport in photosynthetic light harvesting and the role of quantized vibrations. Along the way, I came across a section where the article claimed the ...
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Negative curvature of zero sound dispersion
In the theory of a Landau-Fermi liquid, one of the major predictions is the dispersion of zero sound. From the linearized kinetic equation, we know that the dimensionless dispersion $s$ is given by
$$ ...
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Para- and ortho-excitons in solids with spin-orbit coupling
The names para- and ortho-exciton stem from the fact that -- in superficial analogy to para- and ortho-hydrogen -- the wave function that forms the electron-hole bound state can either be a singlet ...
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Are charged excitation excited states ? - FQHE
I have been reading tong's lectures notes, as well as Prange / Girvin book and Laughlin nobel's lecture. I still can't figure it out.
What is the laughlin ground state off ?
I understand there are ...
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How do experimentalists measure the exciton binding energy?
The exciton binding energy in semiconductors is determined theoretically by the energetic difference between the fundamental gap and the optical gap or, in other words, as the energetic difference of ...
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Population inversion requirement for multiexcitonic lasing
I am working with optically active nanomaterials (quantum dots, perovskites), that have pretty large exciton binding energies and can form multiexcitonic complexes, e.g. biexcitons, relatively easily. ...
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Features of plasmon and surface plasmon polariton
What is the difference between surface plasmon polariton and plasmon in the Hamiltonian? So let's say that I can diagonalize the Hamiltonian of the system I am studying no matter how complicated that ...
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Can continuous translation of Wigner crystal be described by charge neutral density excitations?
In a two-dimensional electron gas (2DEG), under conditions where electron-electron interactions predominate over kinetic energy contributions, the ground state is a Wigner crystal. This crystalline ...
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Difference between Dicke superradiance and dipole-coupled emitter superradiance
This question is similar to "What causes the collective emission in Dicke Model?", but more specific. I wonder if the situation described in
[1] R. H. Dicke – Coherence in Spontaneous ...
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