Biomedical Engineering Reference
In-Depth Information
Fig. 7.16
Spin control. Panel (
a
)—Current through the benzene I-SET vs bias and polarization at
the 6
7 electrons transition. Panel (
b
)—Population of the majority spin 7-particle state. The two
zero current lines at high bias correspond to the maximum or minimum population of the 7-particle
majority spin state and thus identify the spin state of the trapped electron on the molecule. Panels
(
c
)and(
d
)—Schematic representation of the spin selective blocking corresponding to the
dashed
(
c
)and
dotted
(
d
)
lines
of the panels A and B. From [
21
]
→
(quantum dot) closest to the drain; this state is thus also an eigenstate of the
projection of the angular momentum in the direction of the drain lead.
4
At
positive (negative) bias voltages we call this state the
R
(
L
)
-antisymmetric state
.
(ii) The complete interference blocking is only achieved when
|
ψ
R
(
L
)
,
a
[
ρ
block
,
H
eff
]=
0.
4
The corresponding eigenvalue depends on the symmetry of the atomic (quantum dot) wave
function with respect to the molecular (artificial molecule) plane:
h
or 0 for symmetric or
antisymmetric wave functions, respectively.