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Nanosensors
book

Nanosensors

by Vinod Kumar Khanna
April 2016
Intermediate to advanced content levelIntermediate to advanced
666 pages
22h 57m
English
CRC Press
Content preview from Nanosensors
61Introduction to Nanosensors
f E
E
k T
( ) exp= +
1
1
B
(1.30)
Though the predominant tunneling current ow for negative sample voltage
V is directed from sample to tip, there exists a smaller reverse tunneling
current of electrons from tip to sample. The governing equation for this cur-
rent is written in an identical manner. By summation of these currents, and
integration over all energies E, the total tunneling current from sample to tip
becomes
I
E F
A
E E qV
f E f E qV
E
total s t
F
=
+
× +
4
1
2
π
ρ ρ
( ) ( )
( ) ( )) ( ) ( )
{ }
{ }
+
{ }
1 f E f E qV dE
(1.31)
This basic equation can be simplied by applying various ...
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Publisher Resources

ISBN: 9781439827130