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Semiconductor Nanostructure Acoustodynamics. Jens Ebbecke. Linz 25/06/09. outline. fibres and hybrids. acoustoelectrics. acoustooptics. surface acoustic waves. one kind of solutions: surface acoustic waves first investigated in 1885 by Lord Rayleigh for earth quakes. nanostructure.

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Semiconductor Nanostructure Acoustodynamics

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Semiconductor Nanostructure

Acoustodynamics

Jens Ebbecke

Linz 25/06/09


outline

fibres and hybrids

acoustoelectrics

acoustooptics


surface acoustic waves

one kind of solutions: surface acoustic wavesfirst investigated in 1885 by Lord Rayleigh for earth quakes

nanostructure

GaAs

f = cSAW / p


Surface Acoustic Waves andSemiconductor Nanostructures:

the electronic part


Gate Voltage

RF Drive of

Frequency f

3mm

100 nm

Current = e·f

Acoustoelectric Current Device(SET-SAW)


5

f

= 3.58 GHz

P

= 16 dBm

4

T

= 1.7 K

3

Current / nA

2

1

I = e f

.

0

-2.2

-2.1

-2.0

-1.9

Gate Voltage / V

Current Plateaus


RF Amplitude

Vgate

2D data

I=ef

I=2ef

Vgate

I=3ef

RF Amplitude


Interaction of SAW and Impurity dot

PRB 68, 245310, (2003)

Vgate

RF Amplitude

-30 dBm

0 dBm


Semiconductor quantum dots

EF

ΔE

charging energy of a conductor: EC = e2/C  Coulomb blockade

zero-dimensional electronic system:

energy quantisation :

 total energy:

EC = e2/C >> kBT

RT >> h/2e2

ΔE =EN+1 - EN = Δ + EC


.

.

f

3

e

=

I

.

.

Curr. / nA

e

f

=

2

I

.

.

f

e

1

I

=

I = 1·e·f

×

×

I = 1

e

f

RF Amplitude

quantized current through a static quantum dot

APL 84, 4319 (2004)

I = e·f


Vgate

b)

a)

RF Amplitude

-30 dBm

0 dBm

Acoustic turnstile device

a)


Exciting: an Archimedian screw for electrons

PRB 72, 121311(R) 2005

(picture taken from Science,304, 1079 (2004)„Highlights of the recent literature“)


Charge pumping in Carbon Nanotubes

New J. of Phys. 9, 73 (07)PRB 70, 233401 (04)

1m

I = e·f


SAW and GaN nanowires

Nanotechnology19 , 275708 (08)

400 nm

GaN

SiO2 / Au


Surface Acoustic Waves andSemiconductor Nanostructures:

the optic part


Single photon source by bipolar charge transport

GaAs-Quantumwell

GaAlAs

GaAs


Single photon source by bipolar charge transport

PRB 74, 035407 (06)


ZnCdSe/LiNbO3- Hybrid

Epi-Liftoff of ZnCdSe-QWonto LiNbO3 substrate


Finally...

Organic nanofibres

and new stuff


Growth of Carbon Nanosticks

Laser ablation of carbon leads self-organisationof carbon nanosticks->

Pyroelectric effects responsible for nanostick growth

-> organic nanowire son LiNbO3


p6P nanofibres on LiNbO3

Standard white LiNbO3

Black LiNbO3


p6P nanofibres on LiNbO3

5 µm

5 µm

Post-Growth cleaning withTrimethylpentane

Growth on prestructuredmetal electrodes


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