Emergent Quantum Phenomena in Diamond and Other Materials
by
Prof.Gufei Zhang(Danish Institute for Advanced Study, University of Southern Denmark)
→
Asia/Shanghai
ONLINEProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern DenmarkProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern DenmarkProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern Denmark
ONLINEProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern DenmarkProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern DenmarkProf. Gufei Zhang, Danish Institute for Advanced Study, University of Southern Denmark
Description
Abstract
Apart from being a wide-band-gap semiconductor with superior performance in thermionics,¹ power electronics,² optoelectronics,³ and electromechanics,⁴ diamond has also opened new perspectives in quantum technology by being the host material of a number of emergent quantum phenomena.
In this talk, I will first give a brief overview of quantum confinement and coherence effects observed in boron-doped polycrystalline diamond to demonstrate the severe influence of granular disorder on the electrical transport in this material.⁵⁻¹¹ I will then provide a comprehensive presentation of our observations of an unconventional giant negative ‘magnetoresistance’ in nanoscale ring structures made from superconducting diamond thin films.¹² Diamond nanorings like these could be used as artificial atoms to manipulate Cooper pairs in superconducting quantum circuits.
Moreover, I will present our recent findings of emergent magnetoelectronic phenomena, such as coexistent superconductivity and ferromagnetism, giant positive magnetoresistance, nonlinear Hall effect, and long-range coherent magnetic bound states, in diamond.¹³,¹⁴ These intriguing phenomena make ferromagnetic superconducting diamond an attractive system with which to advance quantum physics and develop new applications such as topologically protected qubits for quantum computing.
In addition, the audience will be briefed on our investigations of topological fluctuations of the superconducting order parameter, known as phase slips, in one-dimensional (1D) superconducting nanowires and unconventional phase transitions in a quasi-1D linear chain compound.¹⁵⁻¹⁷
References：
1. R. Zulharnay and P. May, J. Mater. Chem. A 11, 13432 (2023).
2. M. Syamsul et al. Appl. Phys. Lett. 109, 203504 (2016).
3. X. Zhang et al. Appl. Phys. Lett. 122, 062106 (2023).
4. M. Liao et al. Adv. Mater. Technol. 4, 1800325 (2019).
5. G. Zhang et al. Adv. Mater. 26, 2034 (2014).
6. G. Zhang et al. Phys. Rev. Lett. 110, 077001 (2013).
7. G. Zhang et al. ACS Nano 11, 11746 (2017).
8. G. Zhang et al. Phys. Rev. Appl. 6, 064011 (2016).
9. G. Zhang et al. Phys. Rev. Appl. 12, 064042 (2019).
10. G. Zhang et al. Phys. Rev. Mater. 3, 034801 (2019).
11. G. Zhang et al. Phys. Rev. B 84, 214517 (2011).
12. G. Zhang et al. Adv. Mater. 35, 2211129 (2023).
13. G. Zhang et al. ACS Nano 11, 5358 (2017).
14. G. Zhang et al. Sci. Adv. 6, eaaz2536 (2020).
15. J. Li et al. Nat. Commun. 6, 7614 (2015).
16. X. Baumans et al. Nat. Commun. 7, 10560 (2016).
17. C. An et al. Adv. Mater. 32, 2002352 (2020).
Biography
Dr. Gufei Zhang is an Assistant Professor affiliated with the Danish Institute for Advanced Study and the Faculty of Engineering of the University of Southern Denmark.
After obtaining his BSc in Applied Physics from the University of Science and Technology of China, Gufei Zhang worked as a research assistant in the HelmholtzZentrum Dresden-Rossendorf (HZDR) in Germany. Afterwards, he joined the Institute for Nanoscale Physics and Chemistry at Katholieke Universiteit Leuven, Belgium, and earned his PhD degree in Physics under supervision of Prof. Victor V. Moshchalkov in 2013.
Dr. Zhang's research interests and expertise fall within the categories of quantum materials, condensed matter physics, mesoscopic physics, semiconductor physics, and spintronics. His research efforts are mainly devoted to the exploration and investigation of exotic quantum phenomena in diamond and superconducting nanostructures. He has published 39 papers in peer-reviewed journals such as Science Advances (×1), Physical Review Letters (×1), Advanced Materials (×2), ACS Nano (×2), and Nature Communications (×2). In 2014, as a recognition of his achievements in quantum diamond, Dr. Zhang was selected as FWO Fellow by the
Flemish Government. In 2017, he was awarded Seal of Excellence by the Marie Skłodowska-Curie Actions of the European Commission.
