Equation 4 · Part 2 · From Origins to Frontier: A History of Quantum and Condensed-Matter Systems

Symbol T_c

k_B T_c \approx 1.13\, \hbar\omega_D \, e^{-1/N(0)V}

T_c

What this part means

$T_c$ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

$T_c$ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol T_cArticle meaning

The passage around this formula

…one of its few genuinely load-bearing equations, and it is worth writing down because it exposes a real, falsifiable assumption rather than decorating the prose. In the weak-coupling limit, the transition temperature $T_c$ is related to the strength of the electron-phonon coupling N(0)V (density of states at the Fermi level times the pairing interaction) and the characteristic phonon energy $\hbar$ $\omega_D$ (the Debye frequency) by: $k_B T_c \approx 1.13\, \hbar\omega_D \, e^{-1/N(0)V}$ . The exponential is the important feature, not decoration: it…

Read this part in the article →

Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

Open the illustrated subscripts: which member of a family? guide →

See this notation across published equations →

Sources cited in the article section

These citations provide research context; check each source for the exact claim it supports.