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  Probing phase transitions in a soft matter system using a single spin quantum sensor.

Kavatamane, V. K., Duan, D., Arumugam, S. R., Raatz, N., Pezzagna, S., Meijer, J., et al. (2019). Probing phase transitions in a soft matter system using a single spin quantum sensor. New Journal of Physics, 21(10): 103036. doi:10.1088/1367-2630/ab482d.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-75EA-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-75ED-D
Genre: Journal Article

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 Creators:
Kavatamane, V. K.1, Author              
Duan, D.1, Author              
Arumugam, S. R.1, Author              
Raatz, N., Author
Pezzagna, S., Author
Meijer, J., Author
Balasubramanian, G.1, Author              
Affiliations:
1Research Group of Nanoscale Spin Imaging, MPI for Biophysical Chemistry, Max Planck Society, ou_1113579              

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Free keywords: nitrogen-vacancy; diamond; quantum sensor; liquid crystals; spin noise spectroscopy; nuclear magnetic resonance
 Abstract: Phase transitions in soft matter systems reveal some of the interesting structural phenomena at the levels of individual entities constituting those systems. The relevant energy scales in soft matter systems are comparable to thermal energy (k(B)T similar to 10(-21) J). This permits one to observe interesting structural dynamics even at ambient conditions. However, at the nanoscale most experimental probes currently being used to study these systems have been either plagued by low sensitivity or are invasive at molecular scales. Nitrogen-vacancy (NV) centers in diamond is emerging as a robust quantum probe for precision metrology of physical quantities (e.g. magnetic field, electric field, temperature, and stress). Here, we demonstrate by using NV sensors to probe spin-fluctuations and temperature simultaneously to obtain information about controlled phase changes in a soft matter material as a function of temperature. The soft matter system chosen for the study is a standard liquid crystalline (LC) material which shows distinct phases close to room temperature. Individual NV centers at depths of a few nm are used as a probe to detect magnetic signals emanating from a few molecular layers of sample on the surface of the diamond. The organization and collective dynamics of LC molecules in nanoscopic volumes are discussed. Our study aims to extend the areas of application of quantum sensing using NV centers to probe the soft matter systems, particularly those exhibiting mesophases and interesting interfacial properties.

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Language(s): eng - English
 Dates: 2019-10-15
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1367-2630/ab482d
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Title: New Journal of Physics
Source Genre: Journal
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Pages: 8 Volume / Issue: 21 (10) Sequence Number: 103036 Start / End Page: - Identifier: -