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Results tagged with solid-state-physics
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user 36793
Solid-state physics studies how macroscopic properties of solids (mechanical, electrical, optical, etc.) result from their microscopic structure. It usually deals with the scale where quantum properties of the particles are substantial.
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Is the Lennard-Jones potential applicable to any phase of a substance?
The Lennard-Jones potential describes long-range attraction and short-range repulsion. In both solids, liquids, and gases there are attractions and repulsions.
Does it mean that Lennard-Jones form …
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Symmetry Breaking And Phase transition
Is every phase transition associated with a symmetry breaking? If yes, what is the symmetry that a gaseous phase have but the liquid phase does not?
What is the extra symmetry that normal $\bf He$ ha …
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The Lennard-Jones potential and the Pauli exclusion principle
The force between two atoms takes the generic shape of a Lennard-Jones potential. It has an attractive part caused by dipole-dipole attraction and a short-range repulsive part which is said to be caus …
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Phonons and heat conduction
What is the physical picture of heat conduction in a poor conductor? In particular, I'm curious about the role of phonons in conduction in poor conductors. I know that phonons (within the harmonic app …
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Why does the bulk of a superconducting material expel magnetic field but not that of a perfe...
It is well-known that when a superconductor (SC) is cooled below the transition temperature $T_c$, the magnetic field passing through the bulk of the SC is completely expelled. In Zee's book on Quantu …
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How is Meissner effect consistent with the frozen field lines inside the superconductor?
And in fact, it is possible to lock magnetic field lines inside a superconductor if the magnetic field were applied before the material was cooled below $T_c$. This seems to suggest $B\neq 0$ insid …
- 27.2k
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Possibility/nature of SSB in systems with long-range interaction not mediated by gauge fields
Is there any real Condensed Matter system modelled by a Hamiltonian with long-range interaction (except those mediated by any gauge fields) such as long-range spin-spin interaction that displays the p …
- 27.2k
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Connection between the 'spin' and 'polarization' of relativistic and non-relativistic particles
Context 1 The spin $s$ of a relativistic particle of mass $m$ can be read off from the eigenvalue $s(s+1)$ of the operator $-
\frac{W_\mu W^\mu}{m^2}$ in the rest frame of the particle where $W^\mu=\f …
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Why do the $C_v$ of gapless systems have a power law behaviour?
The functional dependence of the heat capacity $C_v$ of systems with gapless excitations (e.g., lattice with acoustic phonons, Heisenberg ferromagnet with spin waves etc) is like a power law $$C_v\sim …
- 213k
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Why does type-I superconductor behave differently than type-II as $H$ is increased?
As one increases the external magnetic field $H$ above a critical value $H_c$, a type-I superconductor abruptly changes to a normal conductor. But for type-II, the transition is not sharp but gradual …
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What is(are) the effect(s) of disorder on electrical conductivity?
As a non-specialist, I asked the question "What are disorders in condensed matter parlance?" about the meaning of disorder in condensed matter physics. I also wrote a non-specialist answer after some …
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Do solids, liquids and gases resist compression due to the same reason?
In crystalline solids, the constituent atoms sit close to each other in their equilibrium positions. The solid is not compressible because as the pressure is increased, the atomic orbitals tend to ove …
CommunityBot
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Identifying transmission spectra of metal, insulator and semiconductors
How can one qualitatively distinguish between the transmission spectra of a metal, a semiconductor and an insulator which are all drawn on the same graph (transmittivity vs wavelength)?
CommunityBot
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Why the electrons below the Fermi level do not conduct electricity?
Physically, why is it that the electrons need to excited above the Fermi level to conduct electricity? In other words, why is the current zero when the electrons lie below the Fermi level? Does Pauli …
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What is the reason of hysteresis loss?
Consider a ferromagnetic material is subjected to a gradually increasing external magnetic field and magnetized to saturation. Then a reverse field is applied to demagnetize the material and then the …
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