KIT researchers develop smallest vibration sensor in the quantum world

smallest vibration sensor in the quantum world

The spin of a molecule (orange) changes and deforms the nanotube (black) mounted between two electrodes (gold).

(Figure: C. Grupe/KIT)

Carbon nanotubes and magnetic molecules are considered building blocks of future nanoelectronic systems. Their electric and mechanical properties play an important role. Researchers of Karlsruhe Institute of Technology and French colleagues from Grenoble and Strasbourg have now found a way to combine both components on the atomic level and to build a quantum mechanical system with novel properties. It is reported now in the print version of nature nanotechnology journal (DOI: 10.1038/nnano.2012.258).

In their experiment the researchers used a carbon nanotube that was mounted between two metal electrodes, spanned a distance of about 1 µm, and could vibrate mechanically. Then, they applied an organic molecule with a magnetic spin due to an incorporated metal atom. This spin was oriented in an external magnetic field.

“In this setup, we demonstrated that the vibrations of the tube are influenced directly when the spin flips parallel or antiparallel to the magnetic field,” explains Mario Ruben, head of the working group at KIT. When the spin changes, the resulting recoil is transferred to the carbon nanotube and the latter starts to vibrate. Vibration changes the atomic distances of the tube and, hence, its conductance that is used as a measure of motion.

The strong interaction between a magnetic spin and mechanical vibration opens up interesting applications apart from determining the states of motion of the carbon nanotube. It is proposed to determine the masses of individual molecules and to measure magnetic forces within the nano-regime. Use as a quantum bit in a quantum computer might also be feasible.

According to the supplementary information published in the same issue of nature nanotechnology such interactions are of high importance in the quantum world, i.e. in the range of discrete energies and tunnel effects, for the future use of nanoscopic effects in macroscopic applications. Combination of spin, vibration, and rotation on the nanoscale in particular may result in entirely new applications and technologies.

POST A COMMENT

Easily post a comment below using your Linkedin, Twitter, Google or Facebook account. Comments won't automatically be posted to your social media accounts unless you select to share.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

NEW PRODUCTS

SEMI-GAS broadens gas mixing capabilities for highly corrosive gases
08/28/2014SEMI-GAS Systems, a provider of ultra-high purity gas delivery equipment, recently broadened the capabilities of its custom Xturion ...
Entegris announces GateKeeper GPS platform
07/15/2014Entegris, Inc., announced last week the launch of GateKeeper GPS, its next-generation of automated regeneration gas purification system (GPS) technology....
Bruker introduces Inspire nanoscale chemical mapping system
07/15/2014Bruker today announced the release of Inspire, the first integrated scanning probe microscopy (SPM) infrared system for 10-nanometer spatial...