Seoul National University NRL HoloTech
Fig. 5-4, p. 156
Davisson-Germer ExperimentDavisson-Germer Experiment
Seoul National University NRL HoloTech
Fig. 5-5, p. 156
Seoul National University NRL HoloTech
Fig. 5-6, p. 157
Seoul National University NRL HoloTech
Fig. 5-7, p. 157 Fig. 5-8, p. 158
Seoul National University NRL HoloTech
The Nobel Prize in Physics 1986The Nobel Prize in Physics 1986
Ernst Ruska (1906-1988)
“for his fundamental work in electron optics, and for the design of the first electron microscope”
“for their design of the scanning tunneling microscope”
Gerd Binnig(1947-)
Heinrich Rohrer (1933-)
Seoul National University NRL HoloTech
Electron Microscopes – TEM, SEMElectron Microscopes – TEM, SEM
Fig. 5-11, p. 160Fig. 5-10, p. 160
Seoul National University NRL HoloTech
Fig. 5-12, p. 161
Seoul National University NRL HoloTech
Fig. 5-13, p. 162
Seoul National University NRL HoloTech
Fig. 5-15, p. 163
Seoul National University NRL HoloTech
Fig. 5-14, p. 162
Seoul National University NRL HoloTech
Fig. 5-16, p. 163Atomic Force Microscope (AFM) image
Seoul National University NRL HoloTech
Fig. 5-17, p. 164
Wave PacketWave Packet
Seoul National University NRL HoloTech
Fig. 5-18, p. 165
( ) ( )
( ) ( ) ( ) ( )
1 2 1 1 2 2
2 1 2 1 2 1 2 1
cos cos
1 12 cos cos2 2
y y y A k x t A k x t
A k k x t k k x t
ω ω
ω ω ω ω
= + = − + −
⎛ ⎞ ⎛ ⎞⎡ ⎤ ⎡ ⎤= − − − + − +⎜ ⎟ ⎜ ⎟⎣ ⎦ ⎣ ⎦⎝ ⎠ ⎝ ⎠
Seoul National University NRL HoloTech
Fig. 5-19, p. 166
Seoul National University NRL HoloTech
Phase Velocity & Group VelocityPhase Velocity & Group Velocity
0
p
gk
vkdvdk
ω
ω
=
=
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Fourier Transform & Inverse FTFourier Transform & Inverse FT
1( ) ( )21( ) ( )2
ikx
ikx
f x a k e dk
a k f x e dx
π
π
∞
−∞
∞ −
−∞
=
=
∫
∫
Seoul National University NRL HoloTech
Fig. 5-21, p. 171
Seoul National University NRL HoloTech
Fig. 5-22, p. 171
Seoul National University NRL HoloTech
Fig. 5-23, p. 172
Seoul National University NRL HoloTech
Fig. 5-24, p. 173
Seoul National University NRL HoloTech
Widths in Fourier RepresentationWidths in Fourier Representation
k xtω
Δ Δ
Δ Δ
와 는반비례
와 는반비례
Uncertainty Principle (불확정성의 원리)
Gaussian wave packet:12
x kΔ Δ =
Minimum!
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