TCM
UoC crest

Danny Bennett

 Danny Bennett

Danny Bennett

Member of St John's College
PhD student in Prof Artacho's group

Office: 538 Mott Bld
Phone: +44(0)1223 3 37216

TCM Group, Cavendish Laboratory
19 JJ Thomson Avenue,
Cambridge, CB3 0HE UK.

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Research

I use Landau theories and ab initio calculations to study screening mechanisms and other effects in perovskite thin films and superlattices. The formation of a two-dimensional electron gas (2DEG) at the interface between LaAlO3/SrTiO3 (LAO/STO) has been well-documented and studied. However in ferroelectric materials such as PbTiO3 (PTO) thin films, 2DEG formation is not well-understood and has not been experimentally observed. This may be due to the fact that polarisation domain formation is a commonly observed method of screening the depolarising field in ferroelectric materials, and there is no need for a 2DEG in most situations. I study the connection between these screening mechanisms: when and why one is more favourable than the other (competition), and whether or not both mechanisms can be observed at the same time, and how they interact (coexistence). I also study other effects in perovskites like LAO/STO (not ferroelectric), such as the rotations of octahedral cages (tilts).

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In Plain English

I study the structure and behaviour of a very common class of materials using both theory and computation. I develop theories to describe interesting effects in these materials, known as perovkites (see picture above), aided by computer simulations.

In particular, I am interested in how certain effects compete and/or interact with each other: Why do they occur? Why are some more favourable than others in certain materials? How are they related to one another? In order to utilise perovskites in modern technology (memory devices, solar cells, etc.), a better understanding of these effects is essential.