Novel Nano Novel Nano-Engineered Semiconductors for ... - Caltech

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3. Graphene Nanoribbons & Related Nanostructures31 3.1. The Rise of GrapheneCarbon structures in different dimensions:0D 1D 2D 3D• Graphene consists of carbon atoms in honeycomb lattice.• Unique Dispersion Relations: massless Dirac Fermions.• First experimental isolationby Geim’s group in 2004.[Novoselov et al, Science (2005).]Two sublattices in thehoneycomb lattice:(Courtesy of M.W. Bockrath)EnergySingle layer Bilayerk
3.2. Physics of grapheneElectronic bandstructuresbandstructures of graphene:• Tight binding approximation, assuming a perfectly ordered infinitesystem, 3 covalently bonded sp 2 and 1 2p z conduction electrons.• The resulting E 2D (k) band structure isNear the “Diracpoints” K & K'3kakaykax 2 yE 2 D( kx, ky) 3 14cos cos 4cos ( eV)vf k2 2 2Images: Ph.D. thesis of Jinseong Heo, Caltech (2008).Image from:http://www.ece.mcgill.ca/~ts7kop/images/graphene_xyz.jpg
Page 1 and 2: Novel Nano-Engineered Semiconductor
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Page 7 and 8: Polarization-sensitive & spatially
Page 9 and 10: • Formation of NWs by selective e
Page 11 and 12: Atomically resolved imaging & spect
Page 13 and 14: Making a transistor out of a strain
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Page 20: Challenges & Current Research DIrec
Page 23 and 24: STM calibration on graphite• We t
Page 25 and 26: STM studies of graphene on SiO 2•
Page 27 and 28: Strain-induced induced modification
Page 29 and 30: Strain-induced induced structural &
Page 31 and 32: 3.4. Potential applications to ligh

Novel Nano Novel Nano-Engineered Semiconductors for ... - Caltech

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