A very low temperature scanning tunneling microscope for the local spectroscopy of mesoscopic structures
Abstract
We present the design and operation of a very low temperature scanning tunneling microscope (STM) working at 60 mK in a dilution refrigerator. The STM features both atomic resolution and micron-sized scanning range at low temperature. We achieved an efficient thermalization of the sample while maintaining a clean surface for STM imaging. Our spectroscopic data show unprecedented energy resolution. We present current-voltage characteristics and the deduced local density of states of hybrid superconductor-normal metal systems. This work is the first experimental realization of a local spectroscopy of mesoscopic structures at very low temperature.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- January 2001
- DOI:
- 10.1063/1.1331328
- arXiv:
- arXiv:cond-mat/0007128
- Bibcode:
- 2001RScI...72..128M
- Keywords:
-
- 07.79.Cz;
- 68.37.Ef;
- 07.20.Mc;
- 73.23.-b;
- Scanning tunneling microscopes;
- Scanning tunneling microscopy;
- Cryogenics;
- refrigerators low-temperature detectors and other low-temperature equipment;
- Electronic transport in mesoscopic systems;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 5 figures, slightly corrected version