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Damped ferromagnetic spin wave
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Physics
Branch of physics
Statistical physics
Quantum magnetism
Ferromagnetic spin chain
Ferromagnetic magnon
2026-09-28
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A
damped ferromagnetic
spin wave
has a
complex
pole
ω
=
±
ω
k
−
i
Γ
k
. Both
poles
of its
retarded Green function
must lie in the lower half of the complex
frequency
plane
so that the response
respects
causality
.
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(7)
Ferromagnetic magnon
Ferromagnetic spin chain
Quantum magnetism
Statistical physics
Branch of physics
Physics
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Past exam of the mathematics course of the University of Cambridge
/
2024
/
iii
/
Paper 337
/
2
/
g
/
Solution
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