Prof Arzhang Ardavan: Publications

Probing the local electronic structure in metal halide perovskites through cobalt substitution

Small Methods Wiley 7:6 (2023) 2300095

Authors:

Amir Haghighirad, M Klug, Liam Duffy, Junyie Liu, Arzhang Ardavan, Gerrit van der Laan, Thorsten Hesjedal, Henry Snaith

Abstract:

Owing to the unique chemical and electronic properties arising from 3d‐electrons, substitution with transition metal ions is one of the key routes for engineering new functionalities into materials. While this approach has been used extensively in complex metal oxide perovskites, metal halide perovskites have largely resisted facile isovalent substitution. In this work, it is demonstrated that the substitution of Co2+ into the lattice of methylammonium lead triiodide imparts magnetic behavior to the material while maintaining photovoltaic performance at low concentrations. In addition to comprehensively characterizing its magnetic properties, the Co2+ ions themselves are utilized as probes to sense the local electronic environment of Pb in the perovskite, thereby revealing the nature of their incorporation into the material. A comprehensive understanding of the effect of transition metal incorporation is provided, thereby opening the substitution gateway for developing novel functional perovskite materials and devices for future technologies.

Fault-tolerant qubit encoding using a spin-7/2 qudit

(2023)

Authors:

Sumin Lim, Junjie Liu, Arzhang Ardavan

P025: RADAR: An international phase III, PET response‐adapted, randomised trial in progress, comparing ABVD±ISRT with brentuximab vedotin+AVD±ISRT in patients with previously untreated limited‐stage classical Hodgkin lymphoma

HemaSphere Wiley 6:Suppl (2022) 12-13

Authors:

John Radford, Toyin Adedayo, Arzhang Ardavan, Sally F Barrington, Leanne Berkahn, Stephane Chauvie, Laura Clifton‐Hadley, Graham P Collins, Michael Crump, David Cutter, Darren Edwards, Martin Hutchings, Tim Illidge, Amy A Kirkwood, Kim Linton, Craig H Moskowitz, Pip Patrick, Beth Phillips, Lois Shepherd, Sanne Tonino, Judith Trotman, Joanna Williams, Nicole Wong Doo

A national service for delivering CD19 CAR‐Tin large B‐cell lymphoma – The UK real‐world experience

British Journal of Haematology Wiley 198:3 (2022) 492-502

Authors:

Andrea Kuhnl, Claire Roddie, Amy A Kirkwood, Eleni Tholouli, Tobias Menne, Amit Patel, Caroline Besley, Sridhar Chaganti, Robin Sanderson, Maeve O'Reilly, Jane Norman, Wendy Osborne, Adrian Bloor, Sanne Lugthart, Ram Malladi, Piers EM Patten, Lorna Neill, Nuria Martinez‐Cibrian, Hannah Kennedy, Elizabeth H Phillips, Ceri Jones, Kirsty Sharplin, Dima El‐Sharkawi, Anne‐Louise Latif, Amrith Mathew, Benjamin Uttenthal, Orla Stewart, Maria AV Marzolini, William Townsend, Kate Cwynarski, Kirit Ardeshna, Arzhang Ardavan, Kate Robinson, Antonio Pagliuca, Graham P Collins, Roderick Johnson, Andrew McMillan

Inherent Spin-Polarization Coupling in a Magnetoelectric Vortex.

Nano letters 22:10 (2022) 3976-3982

Authors:

Sujit Das, Valentyn Laguta, Katherine Inzani, Weichuan Huang, Junjie Liu, Ruchira Chatterjee, Margaret R McCarter, Sandhya Susarla, Arzhang Ardavan, Javier Junquera, Sinéad M Griffin, Ramamoorthy Ramesh

Abstract:

Solid-state materials are currently being explored as a platform for the manipulation of spins for spintronics and quantum information science. More broadly, a wide spectrum of ferroelectric materials, spanning from inorganic oxides to polymeric systems such as PVDF, present a different approach to explore quantum phenomena in which the spins are set and manipulated with electric fields. Using dilute Fe³⁺-doped ferroelectric PbTiO₃-SrTiO₃ superlattices as a model system, we demonstrate intrinsic spin-polarization control of spin directionality in complex ferroelectric vortices and skyrmions. Electron paramagnetic resonance (EPR) spectra show that the spins in the Fe³⁺ ion are strongly coupled to the local polarization and preferentially aligned perpendicular to the ferroelectric polar c axis in this complex vortex structure. The effect of polarization-spin directionality is corroborated by first-principles calculations, demonstrating the variation of the spin directionality with the polar texture and offering the potential for future quantum analogues of macroscopic magnetoelectric devices.

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