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Importance

Explore revolutionary discoveries in carbon nanotubes, ultraflat graphene, tunneling field-effect transistors, and optical cloaking. Witness light emission breakthroughs from single CNT p-n diodes, insightful studies on graphene stability, and pioneering experiments in optical cloaking. From low-power TFETs on plastic substrates to cloaking technology, delve into the forefront of innovative materials and concepts in nanotechnology and physics research.

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Importance

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  1. 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.

  2. 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

  3. Lui et al reported the fabrication and characterization of high-quality ultraflat graphene using a mica support • Used mica because it’s 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 Ultraflat GrapheneBy: Chun Hung Lui, Li Liu, Kin Fai Mak, George W. Flynn & Tony F. Heinz a: graphene on SiO2b: graphene on mica c: cleaved kish graphite d: height histograms of the data

  4. Ferroelectrics+Inhomogeneities=relexors 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

  5. 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.

  6. Before wavefront correction After wavefront correction 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 it’s 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

  7. 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

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