Ezekiel Johnston-Halperin, The Ohio State University, Quantum Magnonics in V[TCNE]2

Date: Mon. October 29th, 2018, 12:45 pm-1:45 pm
Location: Rockefeller 221 (Les Foldy Room)
Website: https://physics.osu.edu/people/johnston-halperin.1

Quantum Magnonics in V[TCNE]₂

 

The study of quantum coherent magnonic interactions relies implicitly on the ability to excite and exploit long lived spin wave excitations in a magnetic material. That requirement has led to the nearly universal reliance on yittrium iron garnet (YIG), which for half a century has reigned as the unchallenged leader in high-Q, low loss magnetic resonance, and more recently in the exploration of coherent quantum coupling between magnonic and spin [1] or superconducting [2] degrees of freedom. Surprisingly, the organic-based ferrimagnet vanadium tetracyanoethylene (V[TCNE]₂) has recently emerged as a compelling alternative to YIG. In contrast to other organic-based materials V[TCNE]₂ exhibits a Curie temperature of over 600 K with robust room temperature hysteresis with sharp switching to full saturation. Further, since V[TCNE]₂ is grown via chemical vapor deposition (CVD) at 50 C it can be conformally deposited as a thin film on a wide variety of substrates with Q rivaling the very best thin-film YIG devices [3], which must be grown epitaxially on GGG substrates at temperatures over 800 C. Work in preparation shows that this Q can be as high as 8,000 (linewidth of 0.50 Oe at 9.86 GHz). Here, we will present evidence of coherent magnonic excitations in V[TCNE]₂ thin films and nanostructures, pointing to magnon-magnon coupling that can be tuned into the strong coupling regime and spin-magnon coupling that allows for the transduction of quantum information from 0D to extended quantum states. These results demonstrate the remarkable potential for these structures to play a major role in the emerging field of quantum magnonics, with applications ranging from the creation of highly coherent magnon crystals to quantum sensing and information.

 

[1] P. Andrich, et al. NPJ Quantum Information 3, 28 (2017).

[2] Y. Tabuchi, et al. Science 349, 405 (2015).

[3] N. Zhu, et al. Applied Physics Letters 109, 082402 (2016).

 

Host: Walter Lambrecht