Facilities

LEEM/PEEM/LEED measurements:

Imaging modes:

  • Bright-field and Dark-field Low-Energy Electron Microscopy (BF/DF-LEEM).
  • Mirror Electron Microscopy (MEM).
  • UV-Photoemission Electron Microsocpy (UV PEEM).
  • Low Energy Electron Diffraction (LEED).

Specifications :

  • Field of view:  2 mm - 150 mm.
  • Lateral resolution resolution in LEEM mode:  <10nm.
  • Vertical resolution:  atomic resolution i.e. able for monoatomic steps imaging.
  • Electron energy:  0 to 500 eV.
  • XY motion range of the sample:  ±5mm.
  • Variable sample temperature :  ~150 K to 2000 K.
  • Heating:
    • Radiative up to  773 K.
    • E-beam heating (up to 2000 K)  wiht PID temperature control.
  • Cooling:  LN2 down to ~150 K.
  • Temperature measurement:  C-type thermocouple (W5%Re/W26%Re) spot-welded on the sample holder.
  • Temporal resolution:  up to 20 frames per second with exposure time 0.01 sec per frame..
  • UV light source for UV-PEEM:  Hg arc lamp  with cut off energy 5.2 eV, Newport.
  • Detector:  Microchannel plate  (Photonis)＋CCD camera (Hamamatsu).
  • Base pressure:  2×10-10 Torr.

In-situ MBE synthesis  in LEEM:

  • Electron beam evaporators:
    • EFM 3, Focus GmbH (Max temperature: 3773K).
    • Futec, Electron Beam Evaporator -1 (Max temperature: 3873 K).

                   *The source material can be replaced without venting the main chamber.

  • Knudsen cells:  
    • HTEZ, MBE Komponenten (Max temperature: 2173 K).
    •  K-Cell Evaporator-1, FUTEC (Max temperature: 1473 K).
    • 2x Homemade  low-temeprature K-cells for C60 / alkali metals (currently K and Li) evaporation.
  • Gas dosing:
    • 3 leak valves for O2 H2 and N2 gases.
  • RF atom source:
    • HD25, Oxford Applied Research souitable for H2, N2 and Ar.

     Other:  RGA 100, Stanford Research Systems.

Preparation chamber:

  • Sputter gun:
    •  IG 2, RBD Instruments.Sputtering with Argon ions up to 2000 eV.
  • Heating:
    • Radiative up to  773 K.        
    • E-beam heating (up to 2000 K) with PID temperature control.
  • Gas dosing:
    •  One  leak valve for Ar gas dosing.
  • Knudsen cells:  
    • K-Cell Evaporator-1, FUTEC (Max temperature: 1473 K).
    • Homemade  low-temperature K-cells for alkali metals (currently K and Li) evaporation.
  • Device fabrication stage:
    • In-situ device fabrication stage, FUTEC.
  • Sample storage capacity:  3 samples.
  • Base pressure:  9×10-10 Torr .

In-situ transport measurements chamber:

  • Transport measurements:
    • In-situ transport measurement stage (4-point probe, mutual inductance, Hall bar), FUTEC.
    • 4K Cryostat, Advanced Research Systems.
  • Sample storage capacity:  5 samples.
  • Base pressure:  9×10-10 Torr .

Click here to download our LEEM data