Are gases included in sold-state physics?

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Discussion Overview

The discussion revolves around whether gases are included in the scope of solid-state physics, particularly in relation to their behavior on a quantum level. Participants explore the definitions and boundaries of solid-state physics, as well as the relevance of gases in various contexts such as thermodynamics, statistical mechanics, and their interactions with solids.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions if the behavior of gases on a quantum level is covered in solid-state physics and seeks recommendations for further study.
  • Another participant defines "solid state" as typically referring to crystalline solids, noting that gases, liquids, and amorphous solids do not form crystals.
  • A participant explains that the study of gases is primarily within thermodynamics and statistical mechanics, but mentions that gas/solid interfaces exist at the boundary of solid-state physics and other fields.
  • It is suggested that certain phenomena in solids can be understood using the physics of ideal gases, with examples such as point defects in crystalline solids and the behavior of electrons at interfaces between metal oxides.
  • Another participant adds that quantum gases are considered in solid-state physics, particularly regarding quasi-electrons in metals and their relation to density functional theory.

Areas of Agreement / Disagreement

Participants express differing views on the inclusion of gases in solid-state physics, with some suggesting that gases are relevant in specific contexts while others maintain that gases are primarily studied in separate fields. The discussion remains unresolved regarding the extent of gases' relevance to solid-state physics.

Contextual Notes

Participants highlight the need for clarity on what specific aspects of solid-state physics and gases are being studied, indicating that the discussion may depend on definitions and the context of study.

res3210
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Hi everyone,

Is the behavior of gasses, on a quantum level, covered in solid-state physics? If so, where can I start? My knowledge of quantum mechanics is very conceptual, very limited in the mathematical part. But by no means do I completely understand all the concepts, just that most of the knowledge I have is conceptual. Any recommendations would be very much appreciated, thanks!
 
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Are gases included in sold-state physics?
What does "solid state" mean?
 
Typically solid-state means <crystalline> solid-state. Gases, liquids and amorpheus solids don't form crystals.
 
Studying gases on their own belongs to thermodynamics and statistical mechanics. However, the study of gas/solid interface is at the boundary between solid state physics and other fields (physical chemistry, materials physics, ...).

Having said that, there are phenomena in solids that can be understood based on the physics of ideal gases (classical or quantum). For example point defects in crystalline solids can be treated as an ideal classical gas. Another example, the electrons at the interface between certain metal oxides behave as a 2-dimensional gas. There are more and more examples. So to study solid state physics, you still have to have a good knowledge of gases.
A good start on the undergraduate level is the book by D. McQuarrie
https://www.amazon.com/dp/0935702997/?tag=pfamazon01-20

Beyond this general introduction, you need to specify more what you want to study in order to get help.
 
To some degree quantum gases are also considered in solid state physics, because the quasi-electrons of metals tend to form them (Fermi gas/Fermi liquid). Also, the electron gas is important both conceptually and practically in that it forms the basis of most density functionals used in Kohn-Sham density functional theory (DFT).
 
Thanks for the input everyone! I appreciate it greatly.
 

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