Single quantum dots as scanning tunneling microscope tips |
| |
Authors: | M Hauser J Smoliner C Eder G Ploner G Strasser E Gornik |
| |
Institution: | Institute of Solid State Electronics & Center of Microstructure Research (MISZ), Floragasse 7, A-1040 Vienna, Austria |
| |
Abstract: | We report the use of single quantum dot structures as tips on a scanning tunneling microscope (STM). A single quantum dot structure with a diameter of less than 200 nm and a height of 2 μm was fabricated by reactive ion etching. This dot was placed on a 40 μm-high mesa and mounted on the tip of a STM. The topography of large structures such as quantum wires or gold test substrates is clearly resolved with such a tip. To check the transport properties of the tip, quantum dot arrays were fabricated on resonant tunneling double barrier structures using the same process parameters. Conventional tunneling spectroscopy clearly resolved the 0D states in our samples. Using a metal substrate as second electrode such STM tips can be used to perform high resolution energy spectroscopy on single dots and free standing wire structures. |
| |
Keywords: | low dimensional structures tunneling scanning tunneling microscopy |
本文献已被 ScienceDirect 等数据库收录! |