In touch with Atoms. - admin.triumf.caadmin.triumf.ca/docs/seminars/Sem7102622547-51769-1... ·...
Transcript of In touch with Atoms. - admin.triumf.caadmin.triumf.ca/docs/seminars/Sem7102622547-51769-1... ·...
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Cu (111)
Metal
Si (100)
Semiconductor
H20 on Au (111)
Snowflake :)
Graphite HOPG
Bi-dimensional crystal Co-TPP on Cu(111)
Functional molecules
SrRuO2
Exotic oxide
A gallery of atomic resolution.
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Democritus meditating on the seat of the soul by Léon-Alexandre Delhomme. 1868.
Atomic hypothesis
The theory of Democritus held that
everything is composed of "atoms",
which are physically indivisible; that
between atoms lies empty space; that
atoms are indestructible; have always
been, and always will be, in motion;
that there are an infinite number of
atoms, and kinds of atoms, which differ
in shape, and size.
Democritus
460-370 BC
Origin
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• The indivisible chemical elements:
(1777) Antoine Lavoisier
• The Periodic Table:
(1871) Mendeleyev
• Statistical Mechanics:
(1890) Boltzmann
• X-Rays: (1895) Röntgen
• Nucleus and electrons : (1910) Rutherford
• Quantum Theory: (1913) Bohr
The case for the existence of atoms…
Lavoisier Rontgen
Boltzmann Bohr
Mendeleev
Rutherford
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What is an atom?
The “Rutherford” atom.
A lithium atom.
Or three electrons “orbiting” around a nucleus made
of three protons and four neutrons.
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118 Atoms
The source of order in the Mendeleyev table
originate in the intimate electronic shell of atoms.
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Electronic Molecular Orbitals
Occupied Un-Occupied
Tight binding description:
New electronic structure is build upon the
elemental wave function of each atoms
From an atom to a molecule
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Bloch wave equipotential in AsGa lattice Band structure of GaAs
Note the semiconducting Gap at Ef=0
Electronic wavefunction is build upon the
periodicity of the crystal lattice
From a molecule to a solid
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What is seeing?
Projection of an interacting particle
from an object onto a detector
Not with usual photons.
Limited by diffraction at 500nm
Can we “see” atoms ?
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In touch with atoms
• X-ray diffraction: Atoms in the reciprocal space
(1920) P. Debye.
• Field Ion Microscope: Atoms on a tip
(1971) E.W. Muller and K. Bahadur.
• Transmission Electron Microscope:
3D sample with atomic resolution
(1931-1970) Ruska to A. Crewe.
• Scanning Probe Microscope:
The almighty microscope for surface
(1981) G. Binning and H. Rohrer
Debye Bahadur
Crewe Binning
& Rohrer
Muller
Ruska
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Seeing atoms: X-Rays diffraction
The Fresnel two slit experiment
Coherent diffraction of an
organized arrays of atoms.
Typical X ray diffraction cliche
Atoms favor periodic arrangement
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Electron Microscope
The original (1930) The modern (2010) Principle of operation
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Electron Microscope
Inverse Fourier Transform of a
diffracted electron beam on a
crystalline multilayer
High Resolution
Scanning Electron Microscope
Electron Energy Loss Spectrometer
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Field Ion Microscope
. The Original FIM
Modern Zeiss FIM
Principle of operation
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Scanning Electron
Micrograph of a W tip
Atomistic modelling
of the tip apex
Field Ion Micrograph
Field Ion Microscope
Sharpening a tip one atom at the time! 20nm
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The Scanning Tunneling Microscope
Bring a tip at within atomic reach to a surface
Measure a tunneling current (It) with a high gain amplifier
Stabilize the tip with a feedback loop on It
Track the tip height variation as the tip is raster in the XY plane
Process the signal to form a 3D rendering of the tip trajectory
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40*40nm STM image of the Silver 111 surface
showing four distinct atomic terraces.
Plane wave travelling trough an energy barrier
defined by the work function of the sample from
the sample to the tip separated by an external
bias eV
It decays exponentially with an increasing barrier width
Characteristic decay length equal 10-10m ,
the size of an atom!
Electron tunneling 101
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Fermi Liquid Sunset on Ag 111.
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Bi 111 Atomic Landscape by STM (2011)
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BiSrCaCuO 100 Atomic Landscape by STM (2011)
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Charge density isolines from
DFT at a height of 2.13 A °.
High Resolution STM showing
Sr centered resolution
Density Functional Theory vs. STM on SrRuO
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0 5 10 15 20 25 30
40
50
0 5 10 15 20 25-5.2
-4.8
-4.4
Cu
rren
t (n
A)
X (A)
Tip
heig
th (
A)
Atomic manipulation
Pushing Carbon Monoxide around
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The atomic domino computer I
Molecule Cascades
A. J. Heinrich, C. P. Lutz, J. A. Gupta and D. M. Eigler (2002)
few minutes
the tipping point!
One CO molecule is stable
Two CO molecules are stable
But three CO molecules want to form a perfect triangle
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The atomic domino computer II
Information transport Building an AND gate
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The atomic domino computer III
A 200nm^2 three input sorter.
Its CMOS equivalent is 10^5 bigger!
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Other fields we are working on.
High Tc-superconductivity
Quantum Spintronics
Architecture in the NanoCosmos
Efficient organics light harvesting device
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Instrumentation: from a few pennies to M$++
Building a state of the art STM.
From a single piezoelectric tube to highly controlled environment
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Sample: building one atom at the time
Molecular beam epitaxy in Ultra High Vacuum
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A quest for lower temperature
Room Temperature
300K
Isolation Neck Vacuum + Radiation shield + low
conduction mechanical support
Helium 4 Bath 4.2 K
He4/He3 Joule
Thompson stage. 1K
He4/He3 Dilution
stage 50mK
STM Head
in a 7T magnetic field
Freeze it!
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A vibration free space
Laboratory for Advanced Imaging Research
State-of-the-art laboratory and scanning probe microscopes
for the study of novel quantum materials at the atomic scale.
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LAIR Construction (Oct 2011)
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60m
m
3D Inchworm 10*5*5mm travel
3 S-SMA 40 GHz connectors
In situ
Tip exchange Body
STM head
From millimetres down to angstrom
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Conclusion
Democritus was right! XKCD
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Acknowledgment
Dr. Yan Pennec
http://www.stm.phas.ubc.ca
Dpt. of Physics and Astronomy
2355 East Mall
Vancouver BC,CA.