FACILITIES and key instruments

Our group at Columbia runs a state-of-the art laboratory for optical and nano-optical characterization of complex materials. Versatility of infrared and optical methods can be appreciated from a quick inspection of characteristic energy scales in solids which all fall in the frequency range that can be covered using a series of instruments available in our group. Development of novel spectroscopic instrumentation is an integral part of our research effort.

Energy scales in quantum materials

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box111References:
1. M. K. Liu, A. J. Sternbach, D. N. Basov, “Nanoscale Electrodynamics of Strongly Correlated Quantum Materials” Reports on Progress in Physics 80, 014501 (2017)

2. D.N. Basov, M.Fogler, A.Lanzara, F. Wang and Y. Zhang, “Spectroscopy of Graphene” Reviews of Modern Physics (2014) [194]

3. D. N. Basov, Richard D. Averitt, Dirk van der Marel, Martin Dressel, and Kristjan Haule “Electrodynamics of correlated electron materials” Reviews of Modern Physics 83, 471 (2011) [149]

4. D. N. Basov and A.V. Chubukov, “Manifesto for higher Tc”, Nature-Physics 7, 272 (2011) [146]

Infrared nano-spectroscopy and nano-imaging at cryogenic temperature

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Spatial resolution 10 nm, scanned area 50×50 μm2, Lasers: mid-IR QCLs & CO2; Difference frequency generation 500-2500 cm-1, pump-probe capabilities. Home-built. Article

Tera-Hertz nano-spectroscopy and nano-imaging at cryogenic temperature

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box33Spatial resolution 10 nm, scanned area 50×50 μm2, Light sources: THz time domain; THz-QCLs (under construction), pump-probe capabilities. Home-built.

Pump-probe nano-spectroscopy and nano-imaging

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box44Spatial resolution 10 nm, hyper-spectral pump-probe imaging, temporal resolution > 35fs; Amplified fiber lasers. Neaspec scanners. Articles [225], [196], [186]

Infrared magneto-optics

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Spectral range: 30-25,000 cm-1. Temperature range: 5-300 K. Magnetic field < 9 T. Microsample capability. Reflectance, transmission, Kerr/Faraday rotation. Bruker Interferometer, Oxford split-coil magnet. Home-built cryogenics and optics. Articles [198][161] [137] [136] [122] [119]

Table 1. Experimental characteristics of spectroscopic instruments available in the Basov laboratory at Columbia.

table1