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Dr. Andrew Morris

Dr. Andrew Morris

Winton Advanced Research Fellow

Room2.90
The Maxwell Centre
JJ Thomson Avenue

Cambridge CB3 0HE
Office Phone: +44 (0)1223 747375

Biography:

I did a Ph.D. in the Theory of Condensed Matter Group in the Cavendish Laboratory. I worked with the group of Richard Needs and Mike Towler using the Quantum Monte Carlo computer code CASINO on a project about BEC-BCS crossover in ultra-cold atomic systems. In the final two years of my Ph.D. I began collaborating with Chris Pickard where I modified his AIRSS method to be suitable to discover point defects in semiconductors. Throughout this project I used the planewave DFT code CASTEP. I then spent three years as a research associate with Prof. Chris Pickard's group in the Condensed Matter and Materials group of the Department of Physics and Astronomy at University College London, before returning to Cambridge as a Winton Fellow.

Research Interests

My current interest is in applying the AIRSS method to a range of different materials science problems, focussing mainly on lithium-ion batteries. "Trial and error" plays a large part in the discovery of new materials. From the initial idea, the material must be synthesised and categorised before it can tested which is slow, difficult and expensive. High-throughput computation accelerates this process by suggesting then screening new materials, allowing us to ask "what if?" without the time and expense of manufacturing and categorizing samples. I model Li-ion batteries at the atomic level and try to uncover new materials to increase their capacity.

I use global search techniques such as ab initio random structure searching (AIRSS) to predict the ground-state structure of materials. From the ground state we use theoretical spectroscopy techniques to compare our results to experiment. As a junior developer of the electronic structure code CASTEP I develop tools for optics, electron-energy loss spectroscopy (EELS) and core-loss analysis through the OptaDOS code. I use and modify CASTEP-NMR to calculate the chemical shielding of battery materials in collaboration with experimentalists. 

Key Publications

Investigating Sodium Storage Mechanisms in Tin Anodes: A Combined Pair Distribution Function Analysis, Density Functional Theory, and Solid-State NMR ApproachJoshua M. Stratford , Martin Mayo , Phoebe K. Allan, Oliver Pecher, Olaf J. Borkiewicz, Kamila M. Wiaderek, Karena W. Chapman⊥, Chris J. Pickard, Andrew J. Morris, and Clare P. Grey, J. Am. Chem. Soc. 139 7273-7286 (2017), DOI:10.1021/jacs.7b01398.

Single-Atom Scale Structural Selectivity in Te Nanowires Encapsulated inside Ultra-Narrow, Single-Walled Carbon NanotubesPaulo V. C. Medeiros, Samuel Marks, Jamie M. Wynn, Andrij Vasylenko, Quentin M. Ramasse, David Quigley, Jeremy Sloan, and Andrew J. Morris, ACS Nano 11 6178-6185 (2017), DOI:10.1021/acsnano.7b02225.

Rationalization of the Color Properties of Fluorescein in the Solid State: A Combined Computational and Experimental StudyM. Arhangelskis, M. Eddleston, D. Reid, G. Day, D-K. Bučar, A. J. Morris, W. Jones, Chem. Eur. J. 22 10065 (2016), DOI:10.1002/chem.201601340.

OptaDOS: A Tool for Obtaining Density of States, Core-loss and Optical Spectra from Electronic Structure CodesAndrew J. Morris, Rebecca J. Nicholls, Chris J. Pickard and Jonathan R. Yates, Comp. Phys. Comm. 185 1477 (2014)

Revealing lithium-silicide phase transformations in nano-structured silicon-based lithium ion batteries via in situ NMR spectroscopyK. Ogata, E. Salager, C. J. Kerr, A. E. Fraser, C. Ducati, A. J. Morris, S. Hofmann and C. P. Grey, Nature Comm. 5 3217 (2014), DOI:10.1038/ncomms4217.