Nanoscale Quantum Sensing with Single Spins in Diamond

11 05/2015

Monday, 11 May. 2015, 17:30 - 19:00

Presenter: Christian Degen
Host: Johannes Majer
Where: ATI, Lecture Hall, Stadionallee 2, 1020 Vienna

Nanoscale Quantum Sensing with Single Spins in Diamond

 

Diamond has emerged as a unique material for a variety of applications, both because it is very robust and because it has defects with interesting properties. One of these defects, the nitrogen-vacancy center, has a single spin associated with it that show quantum behavior up to room temperature. Our group is harnessing the properties of single NV centers for high resolution magnetic sensing applications.

In this talk, I will give an introduction into our group's effort in diamond-based magnetic sensing. I will discuss the basics of "quantum sensing" with NV centers, and show how they can be operated as atom-sized spectrometers with excellent frequency resolution. I will then highlight three recent applications pursued in our laboratory:

- The detection of nuclear magnetic resonance (NMR) signals from nanometer-sized sample volumes deposited on the surface of a diamond chip,

- The measurement of phase transitions in the Skyrmion material FeGe, and

- Scanning magnetic imaging of ferromagnetic particles and current-carrying wires with <50 nm spatial resolution.

The talk will conclude with an outlook of the future prospects of the technique in physics and biology.

 

Recent Review Article: R. Schirhagl, K. Chang, M. Loretz, and C. L. Degen, Nitrogen-Vacancy Centers in Diamond: Nanoscale Sensors for Physics and Biology, Annual Reviews in Physical Chemistry 65, 83-105 (2014)