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Condensed Matter & Materials Physics

Unit Cell

The smallest repeating structural unit of a crystal lattice that generates the entire 3D crystal structure through simple translational…

V_cell = a · (b × c) ų or nm³ (Unit Cell Volume)
Foundations of Physics

Unit Vector

A dimensionless vector with a magnitude of exactly one, used exclusively to specify a direction in space.

û = u / |u| Dimensionless
Plasma Physics

Upper & Lower Hybrid Resonances

Characteristic wave resonance frequencies in magnetized plasmas where wave group velocity vanishes and electromagnetic energy couples…

Upper: ω_UH = √(ω_pe² + ω_ce²); Lower: 1 / ω_LH² = 1 / (ω_ci² + ω_pi²) + 1 / (ω_ce ω_ci) rad/s (Resonance Frequencies)