Questions tagged [transport-phenomena]

Transport phenomenon are mechanisms by which particles or quantities move from one place to another. For example, this could be electrical transport (where electrical charge moves), thermal transport (where thermal energy moves), or molecular diffusion (where mass moves).

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Resistance of the form $(a-bT^2)$

In an experiment I did recently, I built a 2D spin-valve structure with FGT (materials like Fe3GeTe2, which reacts with air to create a thin insulating surface layer) and MoS2 layers. In testing, ...
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If there is no limit to $ZT$, why are there no materials with $ZT>3$?

It is well understood that the thermoelectric performance of a material (described by the parameter $ZT $ ) has no transport related upper theoretical bound. This means a material can exist that can ...
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Group Velocity Formalism vs. Current Operator Formalism in band theory

There are at least two ways to argue about the velocity (or current) in band theory. The first one is the group-velocity formalism $$\mathbf v_g = \frac{1}{\hbar} \nabla_{\mathbf k} \epsilon_{\mathbf ...
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What's the equivalent of the resistance for steady stokes flow? Inverse of the viscosity tensor?

it is well known that we describe electrical propagation in a conductor using the conductivity matrix $A$, through the following laplace equation: $$div(A(x) \nabla u(x))=f(x)$$ where $u$ is the ...