Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Wednesday: New Methods and Developments, Frontiers of Electronic Structure Theory
O 58.14: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
High-frequency shot-noise STM to study correlated electron systems — •Maialen Ortego Larrazabal1, Jiasen Niu2, Koen M Bastiaans3, Jianfeng Ge2, Tjerk Benschop2, Milan P Allan2, and Ingmar Swart1 — 1Debye Institute for Nanomaterials Science, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands — 2Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands — 3Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands
The fluctuations in time of a measured signal provide information that is not present in the time averaged value. For example, the discreteness of the electric charge leads to fluctuations in the tunneling current in an STM, known as shot-noise. Shot-noise measurements convey information about the correlations among the electrons in condensed matter systems, such as the effective charge of the carrier or their distribution in the tunneling process. However, other contributions to the measured noise, such as 1/f and thermal noise, make it difficult to isolate the shot-noise component. For this reason, we use custom-built electronics that allows us to read out the noise signal of the STM at high frequencies and cryogenic temperatures and that does not interfere with conventional STM measurements.