Go Back   AFA Forums > Science, Logic and Reason > General Science News

General Science News Got an idea, article or video you want to share on Science, Philosophy or Evolution?

Reply
 
Thread Tools
  #1  
Old 22nd February 2012, 09:24 AM
Darwinsbulldog's Avatar
Darwinsbulldog Darwinsbulldog is offline
Science Moderator
 
Join Date: Jan 2009
Location: Perth
Posts: 11,412
Default A single-atom transistor <FREE! >

Fuechsle, M., J. A. Miwa, et al. (2012). "A single-atom transistor." Nat Nano advance online publication.
Quote:
The ability to control matter at the atomic scale and build devices with atomic precision is central to nanotechnology. The scanning tunnelling microscope1 can manipulate individual atoms2 and molecules on surfaces, but the manipulation of silicon to make atomic-scale logic circuits has been hampered by the covalent nature of its bonds. Resist-based strategies have allowed the formation of atomic-scale structures on silicon surfaces3, but the fabrication of working devices—such as transistors with extremely short gate lengths4, spin-based quantum computers5, 6, 7, 8 and solitary dopant optoelectronic devices9—requires the ability to position individual atoms in a silicon crystal with atomic precision. Here, we use a combination of scanning tunnelling microscopy and hydrogen-resist lithography to demonstrate a single-atom transistor in which an individual phosphorus dopant atom has been deterministically placed within an epitaxial silicon device architecture with a spatial accuracy of one lattice site. The transistor operates at liquid helium temperatures, and millikelvin electron transport measurements confirm the presence of discrete quantum levels in the energy spectrum of the phosphorus atom. We find a charging energy that is close to the bulk value, previously only observed by optical spectroscopy10.
http://www.nature.com/nnano/journal/...o.2012.21.html

SCIENCE DAILY WRITE-UP HERE:-

http://www.sciencedaily.com/releases...0219191244.htm
__________________
The religious are not necessarily insane, but oft look to it as a state of considerable virtue.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time now is 09:51 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2014, vBulletin Solutions, Inc.