Abstract
We present here the straightforward implementation of pump-probe methods into existing scanning tunneling microscopy (STM) systems. Our method uses the waveform-sequencing abilities of a standard arbitrary waveform generator (AWG) and a simple mechanical relay switch that either connects the regular STM control electronics or the AWG to the STM system. Our upgrade further enables pulsed-ESR excitation for advanced STM based spin-resonance experiments. We demonstrate the technical implementation, signal detection using a lock-in amplifier, and cross-correlation measurements of DC/DC and DC/RF pulses highlighting our ˜5 ns time resolution, here limited by the speed of the available electronics. Our setup is highly versatile and can be extended to suit other needs of STM based investigations such as required in diverse mapping schemes or the coherent manipulation of qubits.•Plug and Play Pump-Probe Capability•One setup for Pump-Probe Spectroscopy and Pulsed-ESR•Waveform Memory Saving and Versatile due to Waveform-Sequencing of Arbitrary Waveforms
Highlights
We present here the straightforward implementation of pump-probe methods into existing scanning tunneling microscopy (STM) systems
The elegant all-electronic pump-probe spectroscopy method, introduced by Loth et al [6], enabled investigation of spin relaxation times in the nanoseconds range with atomic resolution
The lock-in amplifier measures the difference signal IA-IB, that is, the difference between the signal created during cycle A and cycle B. This leads to the cancellation of the currents due to arbs for the pump-pulse (arbP), since the pump-pulse is the same in both parts of the cycle
Summary
We present here the straightforward implementation of pump-probe methods into existing scanning tunneling microscopy (STM) systems.
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