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Personal profile

Research interests

I am interested in simulations (and even occasional calculations) with various sorts of matter on dynamical lattices, random surfaces and random graphs and have also made some forays into solvable nonequilibrium models such as the ASEP (Asymmmetric Exclusion Process) and ZRP (Zero Range Process). I survived coordinating an EC HCM network grant: "Analytical and Numerical Investigations of Random Geometries" (1993-1996) with only marginal hair loss and was foolish enough to take on coordinating another EC IHP network grant "Discrete Random Geometries: From Solid State Physics to Quantum Gravity" and an associated ESF network for the period 2000-2004 but I cunningly passed the role of network co-ordinator onto Renate Loll for the Framework 6 network ENRAGE (2005-2009). More recently, I am co-investigator on the EPSRC grant EP/R009465/1 (PI R. Weston) "Baxter Relations for Open Integrable Quantum Spin Chains" (2018-2021).

 

Biography

Emerging from a PhD in Theoretical Physics at Imperial College in 1986 into a rather bleak Thatcherite landscape I decided to go abroad, first to LPTHE Orsay near Paris in 1986-7, then to Caltech in 1987-9. I managed to be in Berlin in 1989 at the Free University for a few months while the wall came down before rounding off my wanderings in Lancaster as a temporary lecturer in physics in 1990. It occured to me that I could apply for jobs in mathematics as well as physics, which I did, and ended up as a lecturer at Heriot-Watt in 1990. I have been here ever since as a senior lecturer, reader and professor apart from a year's leave of absence in 1993-4 as a Marie Curie Fellow at Orsay again and shorter sojourns at the Institut Henri Poincare, the Niels Bohr Institute and Nordita. Since 2013 I have been involved with lecturing at the African Institute of Mathematical Sciences (AIMS) in Ghana, Senegal and South Africa.

Fingerprint Dive into the research topics where Desmond Alexander Johnston is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

Ising model Physics & Astronomy
gravitation Physics & Astronomy
scaling Physics & Astronomy
Feynman diagrams Physics & Astronomy
exponents Physics & Astronomy
simulation Physics & Astronomy
strings Physics & Astronomy
curvature Physics & Astronomy

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Research Output 1991 2019

Lattice SUSY for the DiSSEP at λ2 = 1 (and λ2 = −3)

Johnston, D. A., 29 Oct 2019, In : Journal of Physics Communications. 3, 10, 105011.

Research output: Contribution to journalArticle

Open Access
File
exclusion
Markov processes
supersymmetry
symmetry

Exact solutions to plaquette Ising models with free and periodic boundaries

Mueller, M., Johnston, D. A. & Janke, W., Jan 2017, In : Nuclear Physics B. 914, p. 388-404 17 p.

Research output: Contribution to journalArticle

Open Access
File
free boundaries
Ising model
boundary conditions
products
ceilings

Plaquette Ising models, degeneracy and scaling

Johnston, D. A., Mueller, M. & Janke, W., 5 Apr 2017, In : European Physical Journal-Special topics. 226, 4, p. 749–764 16 p.

Research output: Contribution to journalArticle

Open Access
File
Ising model
scaling
defects

Finite-size scaling and latent heat at the gonihedric first-order phase transition

Janke, W., Mueller, M. & Johnston, D. A., 2015, In : Journal of Physics: Conference Series. 640, 7 p., 012002.

Research output: Contribution to journalArticle

Open Access
File
latent heat
boundary conditions
scaling
heat
Ising model

Macroscopic degeneracy and order in the 3D plaquette Ising model

Johnston, D. A., Mueller, M. & Janke, W., 2015, In : Modern Physics Letters B. 29, 10 p., 1550109.

Research output: Contribution to journalArticle

File
Ising model
cubic lattices
apexes
scaling
symmetry