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Physics Nobel Prize 2000Integrated Circuit
Silicon Technology
Gordon Moore
Jack Kilby
Moore’s Law
Intel
14 nm2014
Alferov KroemerPhysics Nobel Prize 2000
Electrons in the Conduction Band
Holes in the Valence Band
n-typep-type
Benefits of a quantum well:
1) Trap electrons and holes in the same quantum well and thereby give them more time to recombine into a photon.
2) Electrons and holes have well-defined, quantized energies, such that most of them contribute to the same laser line.
Physics Nobel Prize 2014Akasaki Amano Nakamura
Use InGaN quantum wells in GaN.
Lighting consumes ¼ of our electric power.
Blue LED + Yellow Phosphor = White Light
Efficient Light Emitting Diodes
CCD (Charge Coupled Device)
Physics Nobel Prize 2009 : Boyle and Smith
The CCD detectors in digital cameras wiped out photographic film.
Parallel Spin Filters
Resistance Low
Opposing Spin Filters
Resistance High
Giant Magnetoresistance (GMR)for Sensitive Magnetic Readout
2007 Nobel Prize in Physics to Fert and Grünberg
Scanning Tunneling Microscopy (STM)
• Electron wave functions of the tip and surface atoms overlap and allow electrons to tunnel across vacuum.
• The tunneling probability decreases by a factor of 100 when retracting the tip by one atom diameter (0.2 nm).
1986 Nobel Prize in Physics to Binnig and Rohrer
A significant fraction of our energy consumption goes into producing ammonia for fertili- zers. Plants need nitrogen in a form that can be biologically converted into proteins. The triple bond in N2 is too stable for that.
The Haber-Bosch synthesis uses iron oxide as catalyst to break the triple bond in N2 . High temperature (4000C) and high pressure (200 atmospheres) drive the reaction to the right side: N2 ammonia nitrites nitrates for fertilizers
Gerhard Ertl received the 2007 Nobel Prize in Chemistry for systematically unraveling the molecular reactions underlying the Haber-Bosch process (1918 Nobel Prize in Chemistry).
Surface Chemistry of Ammonia Synthesis
N2 + 3 H2
3 NH3
Density Functional Theory provides a practical method for calculating
the behavior of electrons in molecules and solids
Walter Kohn, 1998 Nobel Prize in Chemistry
Quantum Hall EffectPrecision measurements of fundamental constants:
Resistance standard h/e2 , Electromagnetic coupling constant = e2/ħc
Klaus von Klitzing, Nobel Prize in Physics 1985
Fractional Quantum Hall EffectExotic forms of matter in two dimensions:
One electron (blue circle) orbits around three magnetic flux quanta (arrows).
Horst Störmer Dan TsuiBob LaughlinNobel Prize in Physics 2000
Superconductors and Superfluids
1987 Physics Nobel Prize: Bednorz Müller 2003 Physics Nobel Prize:
Abrikosov
Ginzburg
Legett
Graphene, a single sheet of graphite
Nobel Prize in Physics 2010
Graphene is extremely strong and provides
a transparent conductor with high electron
mobility. Its E(p) relation is linear instead
of a quadratic, which causes a different kind
of quantum Hall effect.
Geim and Novoselov
The only winner of a Nobel Prize and an Ig Nobel (“Ignoble”) Prize
Andre Geim’s frog levitation
experiment:
Same idea as levitating a
piece of superconductor by
a magnetic field. Both frogs
and superconductors are
diamagnetic. The induced
magnetic field opposes the
inducing field and leads to
repulsion.
Fullerenes (Buckyballs)
Zero-dimensional carbon
1996 Nobel Prize in Chemistry to: Curl Kroto Smalley
Soft Matter
“Soft”
matter does not exhibit the crystalline order that is characteristic of “hard”
matter. Its shape is dominated by entropy rather than energy.
Soft matter lends itself to self-assembly, from block copolymers (AAABBBBB) to living things.
Pierre-Gilles de Gennes
received the 1991 Physics Nobel Prize for bringing order into soft matter.
Protein Crystallography
•
Protein crystallography has become essential for biochemistry,
because the structure
of a protein determines its function.
•
This diffraction pattern of myoglobin
contains about 3000 spots.
From their intensities one obtains the positions of all the atoms.
Rosalind Franklin’s X-ray diffraction pattern of DNA, which led to the double-helix model by Watson and Crick
Structure of Ion Channels from
X-Ray Crystallography
2003 Nobel Prize in ChemistryTop view of an ion channel (ion at the center)
Also Prizes in 2012, 2009, 2006, …
Magnetic Resonance Imaging (MRI)
Use nuclear magnetic resonance (NMR) of protons in water.
Obtain spatial resolution by varying the magnetic field across the sample.
Nobel Prize in Chemistry 1991
Simultaneous measurement of all frequencies from the Fourier trans- form of a short pulse ( which is a continuous frequency spectrum ) .
Richard Ernst