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of 55
pro vyhledávání: '"Chapman, Jacob"'
A machine-learned spin-lattice interatomic potential (MSLP) for magnetic iron is developed and applied to mesoscopic scale defects. It is achieved by augmenting a spin-lattice Hamiltonian with a neural network term trained to descriptors representing
Externí odkaz:
http://arxiv.org/abs/2205.04732
Publikováno v:
Phys. Rev. B 102, 224106 (2020)
Fundamental flaws in the Heisenberg Hamiltonian are highlighted in the context of its application to BCC Fe, including the particular issues arising when modelling lattice defects. Exchange integrals are evaluated using the magnetic force theorem. Th
Externí odkaz:
http://arxiv.org/abs/2004.00895
Autor:
Chapman, Jacob Bernard John
Lead zirconate titanate is a ferroelectric material of considerable interest with a wide range of technological applications. It has been the subject of many experimental and theoretical studies yet there are a number of unsolved questions preventing
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756328
Autor:
Chapman, Jacob
One of the principle causes for deviations between predicted and simulated performance of buildings relates to the stochastic nature of their occupants: their presence, activities whilst present, activity dependent behaviours and the consequent impli
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.719463
Publikováno v:
In European Journal of Political Economy September 2022 74
Autor:
Chapman, Jacob W.
Ever since the introduction of the Anderson model in 1958, physicists and mathematicians alike have been interested in the effects of disorder on quantum mechanical systems. For example, it is known that transport is suppressed for an electron moving
Externí odkaz:
http://pqdtopen.proquest.com/#viewpdf?dispub=3561259
Autor:
Hodgson, Matthew J. P., Ramsden, James D., Chapman, Jacob B. J., Lillystone, Piers, Godby, Rex W
Publikováno v:
Phys. Rev. B 88, 241102(R) (2013)
By propagating the many-body Schr\"odinger equation, we determine the exact time-dependent Kohn-Sham potential for a system of strongly correlated electrons which undergo field-induced tunneling. Numerous features are entirely absent from the approxi
Externí odkaz:
http://arxiv.org/abs/1312.2534
Autor:
Chapman, Jacob, Stolz, Günter
Publikováno v:
Ann. Henri Poincar\'e 16 (2015), no. 2, 405-435
We study a class of random block operators which appear as effective one-particle Hamiltonians for the anisotropic XY quantum spin chain in an exterior magnetic field given by an array of i.i.d. random variables. For arbitrary non-trivial single-site
Externí odkaz:
http://arxiv.org/abs/1308.0708
Autor:
Chapman, Jacob B. J.1 (AUTHOR) Jacob.Chapman@ukaea.uk, Ma, Pui-Wai1 (AUTHOR)
Publikováno v:
Scientific Reports. 12/27/2022, Vol. 12 Issue 1, p1-15. 15p.
Autor:
Chapman, Jacob1, Manoharan, Sanjivan1
Publikováno v:
Proceedings of the ASEE Annual Conference & Exposition. 2019, p16805-16822. 18p.