Molecular Beam Epitaxy
& Scanning Tunneling Microscopy

Researchers

Can-Li Song, Dennis Huang, Tatiana Webb

Instrument

• Simple explanation of STM (no equations)
• Technical explanation of STM
• Measurements we can make with an STM
• Explanation of Spin-Polarized STM

We have constructed a custom ultra-high-vacuum, variable temperature scanning tunneling microscope with the following features:

• Vibration isolation: floating room, floating table,
  internal suspension from magnetically damped springs.
• Temperature: 2K up to 300K
• Magnetic field: 9 Tesla vertical, 3 Tesla horizontal
• Scan Range: 1μm scan at room temperature;
  several mm coarse (x,y,z) motion of sample with respect to tip
• Tip/sample: in-situ tip/sample exchange
• Surface prep: cold cleaver, molecular beam epitaxy

STM body

Fig. 1: Diagram and photo of microscope.

Flow Cryostat

Fig. 2: Diagram and photo of cryostat.

Vacuum Chamber

Fig. 3: Diagram and photo of vacuum chamber.

Molecular Beam Epitaxy

Fig. 4: Photo and diagram of molecular beam epitaxy system.
Current source elements are Fe, Se, Si, Pb, Bi, Co, Cu, Ni, and Ag.