Landau–Peierls instability

E334545

Landau–Peierls instability is a theoretical prediction in condensed matter physics that shows how long-wavelength thermal fluctuations destroy true long-range positional order in low-dimensional crystalline systems.

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Landau–Peierls instability canonical 1

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Predicate Object
instanceOf concept in condensed matter physics
theoretical prediction
affects Bragg peak structure in low-dimensional crystals
appliesTo low-dimensional crystalline systems
one-dimensional crystals
two-dimensional crystals
assumes short-range interactions
thermodynamic limit
basedOn continuum elastic theory of crystals
harmonic approximation for lattice vibrations
concerns equilibrium properties of crystals
long-wavelength fluctuations
positional order
thermal fluctuations
describes destruction of true long-range positional order
distinguishedFrom destruction of orientational order
doesNotApplyTo three-dimensional crystals with short-range interactions
explains impossibility of perfect long-range translational order in ideal 2D crystals at finite temperature
field condensed matter physics
holdsAt finite temperature
implies broadening of Bragg peaks into power-law singularities in 2D
logarithmic growth of displacement correlations with distance in two dimensions
only quasi-long-range positional order in two-dimensional crystals
power-law decay of positional correlations in two-dimensional crystals
mathematicalFeature infrared divergence of displacement fluctuations in low dimensions
mechanism long-wavelength phonon fluctuations
namedAfter Lev Landau
Rudolf Peierls
predicts absence of true long-range translational order in low-dimensional crystals at finite temperature
divergence of mean-square atomic displacements with system size in low dimensions
relatedTo Goldstone modes associated with broken translational symmetry
Kosterlitz–Thouless–Halperin–Nelson–Young theory
Coleman theorem on symmetry breaking in two dimensions
surface form: Mermin–Wagner theorem

fluctuation-induced destruction of order
phonon spectrum in low dimensions
two-dimensional melting
relevantFor low-dimensional soft-matter crystals
one-dimensional charge-density waves
one-dimensional spin-density waves
thin crystalline films
two-dimensional materials

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Lev Landau knownFor Landau–Peierls instability