Nonlinear Current–Voltages Curves of Noble Metal Quantum Point Contacts
Current–voltage ( I – V ) curves were studied for the quantum point contacts (QPCs) of gold, platinum, silver and copper at room temperature. Nonlinear I – V curves of a cubic function, I = a V + c V 3 , were found for all QPCs, that were fabricated between a cleaned Scanning Tunneling Microscope (S...
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| Published in | Japanese Journal of Applied Physics Vol. 44; no. 9L; p. L1178 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2005
|
| Online Access | Get full text |
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| Summary: | Current–voltage (
I
–
V
) curves were studied for the quantum point contacts (QPCs) of gold, platinum, silver and copper at room temperature. Nonlinear
I
–
V
curves of a cubic function,
I
=
a
V
+
c
V
3
, were found for all QPCs, that were fabricated between a cleaned Scanning Tunneling Microscope (STM) tip and a cleaned substrate in an ultrahigh vacuum. The nonlinear parameter
c
/
a
was found to be positive, and scattered in the range of ∼0 to 1 [1/V
2
] independent of the conductance at the zero-bias voltage. The average value of
c
/
a
showed no strong dependence on the metal elements. |
|---|---|
| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.44.L1178 |