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The LT-STM is specially designed for working at atomic scale at low temperature (i.e. to perform atomic / molecular manipulation or local spectroscopy). It has a modified Besocke beetle design which ensures its high stability (dz<1pm) and only a small drift. 

The STM is thermally isolated. Its temperature can be varied between 6 … 300K. The low temperature of the STM freezes the motion of most adsorbates that can be evaporated onto the sample surface either inside or outside the STM.

The surface/adsorbates can be investigated for weeks. No degredation of the sample will be observed as long as the 4K radiation shield that surrounds the STM remains cold.

Due to the design of the cryostat a very low helium consumption is achieved which requires to refill only 4 l of liquid helium every 48 hours when the STM is at its lowest temperature.

The whole scan unit is digitally controlled. Therefore a precise tip-postioning on any spot of the sample with any tunneling parameter can be made. This can be used to perform local spectroscopic measurements (i.e. I(V), I(Z)) to reveal electronic or vibrational properties of the sample or the interaction between tip and sample as well a different kinds of manipulation techniques.

Any information (I(t), U(t), XYZ(t), dI/dU …) can also be recorded during the maniulation.

The standard scan range of 1.5µm x 1.5µm x 0.3µm can be adopted to the desired range. The minimum tunneling current is 2pA.

The system provides optical access onto the sample to control the exact position of the tip with the help of a telescope. The sample transfer can also be done at low temperature. A helium cooled manipulator allows you to prepare, analyze and transfer the samples at temperatures down to 20K.

CreaTec's LT-STM was developed with Dr. Gerhard Meyer at the FU Berlin in the group of Prof. Rieder. Following the demand of our customers we are continuously developing this instrument. It is very well known for it's outstanding stability and performance in the scientific community.

• High stability Besocke beetle type STM
• Very small drift at low temperature: <2Å/h in thermal equilibrium
• Temperature variable: 6-300K
• Optional pumping of the LHe cryostat for temperatures below 4K
• Very low helium consumption: 4 litres in 48 hours guaranteed (up to 100h achieved!)
• Optical access to the tunnelling junction
• 6 electrical contacts to the sample in the STM
• Sample transfer at low temperatures
• Magnetic tip transfer system
• Scan range: 1µm x 1µm x 0.2µm @ 6K
• Clean ‘in situ’ dosing or evaporation
• Powerful software with spectroscopy and nanostructuring support