Correlated Electrons at the Nanoscale

Research in the Hoffman laboratory is motivated by the conviction that technological solutions are driven by new materials, and that the materials frontier lies in the design of emergent properties at interfaces and small length scales. Our research combines atomic layer-by-layer growth and atomic resolution imaging of materials, to uncover new physics and applications inaccessible via bulk synthesis and probes. We have used scanning tunneling microscopy (STM) and magnetic force microscopy (MFM) to investigate fundamental mechanisms of electron pairing and technical challenges of vortex pinning in high-Tc superconductors. We have used conducting atomic force microscopy (CAFM) to control the metal-insulator transition in VO2 at the nanoscale. We have used STM to map the band structure of the topological materials Sb and SmB6. We have incorporated a molecular beam epitaxy (MBE) system to create novel heterostructures and tailor their properties using atomic resolution feedback from in situ STM.

Detailed Research Description

Materials


MBE-grown FeSe
first FeSe
Ba(Fe1-xCox)2As2
Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub>
NdFeAsO1-xFx
NdFeAsO<sub>1-x</sub>F<sub>x</sub>
PrxCa1-xFe2As2
Pr<sub>x</sub>Ca<sub>1-x</sub>Fe<sub>2</sub>As<sub>2</sub>
Bi2Sr2CuO6+x Bi-2201
Bi2Se3
Bi<sub>2</sub>Se<sub>3</sub>
Bi2Sr2CaCu2O8+x Bi-2212 Sb(111)
Sb(111)
VO2
VO<sub>2</sub>
Nd2Fe14B
Nd<sub>2</sub>Fe<sub>14</sub>B
SmB6
SmB<sub>6</sub>
KxSr1-xFe2As2
K<sub>x</sub>Sr<sub>1-x</sub>Fe<sub>2</sub>As<sub>2</sub>
Li0.9Mo6O17
Li<sub>0.9</sub>Mo<sub>6</sub>O<sub>17</sub>
La2SrMn2O7
La<sub>2-2x</sub>Sr<sub>1+2x</sub>Mn<sub>2</sub>O<sub>7</sub>
NbSe2
NbSe<sub>2</sub>

Microscopes


STM
STM

MFM / CAFM
MFM

MBE-STM
MBE-STM

These microscopes are housed in a low-vibration laboratory designed by Wilson Architects.

Wilson logo

Funding


List of funding sources.