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THERMAL CONDUCTIVITY MM5, LUA YU HUI A19SC0158 - Coggle Diagram
THERMAL CONDUCTIVITY MM5
PHONON MEAN FREE PATH
THERMAL CONDUCTION BY PHONONS
ANHARMONIC EFFECTS
PHONON COLLIDES WITH EACH OTHER
COLLISION LIMIT THERMAL CONDUCTIVITY
DUE TO FLOW OF PHONONS
NORMAL PROCESS ( N-PROCESS )
K1 COLLIDE WITH K2 , ANNIHILATE , CREATE PHONON WITH K3
OBEYING
CONSERVATION OF CRYSTAL MOMENTUM
CONSERVATION OF ENRGY
MAINTAIN THERMAL EQUILIBRIUM
BEFORE INTERACTION
ENERGY FLOW TO THE RIGHT
AFTER INTERACTION
ENERGY FLOW TO THE RIGHT
AFTER/BEFORE INTERACT
DOES NOT ALTER DIRECTION OF ENERGY
CANNOT CONTRIBUTE THERMAL RESISTANCE
K=0
UMKLAPP PROCESS ( U-PROCESS )
MORE COLLINEAR
VECTOR SUM TO THE RIGHT
OUTSIDE THE FIRST BRILLOUIN ZONE
K3 RECIPROCAL LATTICE VECTOR POINTS TO THE LEFT
ENERGY FLOW IS REVERSED
K IS NOT EQUAL TO 0
PROVIDE FINITE THERMAL CONDUCTIVITY
PROVIDE THERMAL RESISTANCE TO PHONON FLOW
CONSERVATION LAW
SOLID LINE
W VS K FOR ACOUSTIC PHONONS
LA BRANCH
SINGLY DEGENERATE
TA BRANCH
DOUBLY DEGENERATE
THERMAL CONDUCTIVITY DUE TO EFFECTS
LUA YU HUI A19SC0158
