Importance

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Importance
This is the first demonstration of light emission
from a single carbon nanotube p-n diode and it
exhibits a narrower electroluminescent emission
spectrum and lower power consumption than any
other CNT light emitter.
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Silicon nanowire-based tunneling field-effect
transistors (TFETs) on flexible plastic substrates
TFETs on polyethersulfone plastic substrate can
be used for applications in low power dissipation
by scaling down the threshold voltage, which is
not applicable in metal-oxide-semiconductor
field-effect transistors(MOSFETs).
Lee et al.,Nanotechnology 20 (2009) 455201
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Ultraflat GrapheneBy Chun Hung Lui, Li Liu, Kin
Fai Mak, George W. Flynn Tony F. Heinz

• Lui et al reported the fabrication and
  characterization of high-quality ultraflat
  graphene using a mica support
• Used mica because its easy to create
  atomically flat surfaces as large as 100µm
• Compared graphene layers on mica and SiO2 using
  amplitude-modulation AFM
• Graphene layers on SiO2 roughly follow the
  contours of the substrate
• Height difference in layers on mica could be
  attributed to instrumental noise
• Important because it provides insight into
  thermodynamic instability of this 2-D system
• Also provides a reference material to study the
  role of ripples in graphene

a graphene on SiO2 b
graphene on mica c cleaved kish graphite
d height histograms of
the data
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FerroelectricsInhomogeneitiesrelexors
Importance offer an insight to the physical
basis of relaxors-ferroelectrics
Fu et al. Relaxor Pb(Mg1/3Nb2/3)O3 A
Ferroelectric with Multiple Inhomogeneities.
Phys. Rev. Lett. (2009) vol. 103 (20) pp. 207601
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An optical cloak made of dielectrics
Experiment
Simulation
Flat surface
Bump w/o a cloak
Bump w/ a cloak
To make things Invisible is interesting, and this
is the first experimental demonstration of
optical cloaking.
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Nature Physics, published online 2009

• 20 keV x-rays focused to 10 nm with mirrors at
  Spring-8
• one laterally graded focusing mirror
• One has 18 piezoelectric strips glued on the back
  so its dynamically deformable
• Measure profile of deformable mirror with
  interferometer, use piezos to adjust for thermal
  expansion, etc.
• Measure beam intensity profile and reconstruct
  wavefront
• Obtained stable, sub- 10nm focus for more than 12
  hours

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A high-mobility electron gas atthe LaAlO3/SrTiO3
heterointerface

• Films of LaAlO3 grown on STO substrates
• LaO/TiO2 interface showed n-type conductivity
  with high mobility

A. Ohtomo and H. Y. Hwang. Letters to Nature,
427 (2004) pp. 423-427