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Infrared Spectroscopy of
Novel Electronic and Magnetic Materials |
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Research Interest: Investigate electronic and magnetic
properties of novel materials employing
spectroscopic techniques such as infrared and magneto-optical spectroscopy,
microscopy, and ellipsometry. Projects: 1: Electrostatic
doping of novel materials using FET devices, organic electronics, charge transport in polymers and organic
molecular crystals. Electrostatic doping
using the FET principle provides new opportunities to modify the
electronic and magnetic properties of novel materials. Many new physical
phenomena produced by electrostatic doping in various interesting systems are
yet to be explored. We have been able to employ infrared light to directly
probe the electronic excitations in functional FET devices based on organic
molecular crystals and polymers. These studies have uncovered many new
aspects of charge dynamics and charge transport in organic materials. (See our paper in PRL, Nano Letters, PRB, and organic electronics in Basov Lab. ) 2: Magneto-optical and magneto-transport
properties of graphite and graphene. We performed the first systematic magneto-optical investigation of graphite in magnetic fields up to 18T. These results provide new insights into the anomalous magneto-transport of graphite. (See our paper in PRB.) Recently, we extended this study to 31T field to study the possible charge density wave phase of graphite. Graphene (a monolayer of graphite) exhibits a lot of intriguing properties... Publications: 1:
Z.Q. Li, V. Podzorov, N. Sai,
M.C. Martin, M.E. Gershenson, M. Di Ventra and D.N. Basov,
“Light Quasiparticles
Dominate Electronic Transport in Molecular Crystal Field-Effect Transistors”,
Phys. Rev. Lett. 99, 016403 (2007). PDF 2: Z. Q. Li,
S.-W. Tsai, W. J. Padilla, S. V. Dordevic, K.
S. Burch, Y. J. Wang, and D. N. Basov, “Infrared
probe of the anomalous magnetotransport of highly
oriented pyrolytic graphite in the extreme quantum
limit”, Phys. Rev. B 74, 195404 (2006). PDF 3: Z. Q. Li, G. M. Wang, N. Sai, D. Moses, M. C. Martin, M. Di Ventra, A. J. Heeger, and D. N. Basov, “Infrared Imaging of the Nanometer-Thick Accumulation Layer in Organic Field-Effect Transistors”, Nano Letters 6, 224 (2006). PDF 4:
Z.Q. Li, G.M. Wang, K.J. Mikolaitis, D.Moses, A. J. Heeger, and D.N.
Basov, “An infrared probe of
tunable dielectrics in metal-oxide-semiconductor structures”, Appl. Phys. Lett. 86,
223506 (2005). PDF 5:
A. D. Meyertholen, Z. Q. Li, D. N. Basov, M. M. Fogler, M. C.
Martin, G. M. Wang, A. S. Dhoot, D. Moses, and A.
J. Heeger, “Concentration-dependent
mobility in organic field-effect transistors probed by infrared spectromicroscopy of the charge density profile”,
Appl. Phys. Lett. 90,
222108 (2007). PDF
6:
N. Sai, Z.Q. Li, M.C. Martin, D.N. Basov, and M. Di Ventra, “Electronic excitations and metal-insulator
transition in poly(3-hexylthiophene) organic field-effect transistors”,
Phys. Rev. B 75, 045307 (2007). PDF 7:
Y. S. Lee, Z. Q. Li, W. J. Padilla, S. V. Dordevic, C. C. Homes, K. Segawa, Y. Ando, and D. N. Basov, “Strong-coupling effects in cuprate
high-Tc
superconductors by magneto-optical studies”, Phys.
Rev. B 72, 172511 (2005). PDF 8:
Y. S. Lee, K. Segawa, Z. Q. Li, W. J. Padilla, M. Dumm, S. V. Dordevic, C. C. Homes, Y. Ando, and D. N.
Basov, “Electrodynamics of the
nodal metal state in weakly doped high-Tc cuprates”, Phys. Rev. B 72,
054529 (2005). PDF 9:
W.J. Padilla, Z.Q. Li, K.S. Burch, Y.S. Lee, K.J. Mikolaitis,
and D.N. Basov, “Broadband multi-interferometer spectroscopy in high
magnetic field from THz to visible”, Review of Scientific
Instruments 75, 4710 (2004). PDF
In the News
"IR Spectroscopic Techniques Probe Organic Field Effect Transistors" by Photonics Spectra, March 2006. PDF "Probing Organic Transistors with Infrared Beams" by science@berkeley lab, April 2006. PDF "Probing Organic Transistors with Infrared Beams" by ALS Science Highlights, July 2006. PDF |
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