Search Results for author: Steven Johnston

Found 4 papers, 1 papers with code

A Symbolic Representation of Human Posture for Interpretable Learning and Reasoning

no code implementations17 Oct 2022 Richard G. Freedman, Joseph B. Mueller, Jack Ladwig, Steven Johnston, David McDonald, Helen Wauck, Ruta Wheelock, Hayley Borck

Robots that interact with humans in a physical space or application need to think about the person's posture, which typically comes from visual sensors like cameras and infra-red.

Activity Recognition

A Group-Equivariant Autoencoder for Identifying Spontaneously Broken Symmetries

1 code implementation13 Feb 2022 Devanshu Agrawal, Adrian Del Maestro, Steven Johnston, James Ostrowski

We use group theory to deduce which symmetries of the system remain intact in all phases, and then use this information to constrain the parameters of the GE-autoencoder such that the encoder learns an order parameter invariant to these ``never-broken'' symmetries.

Pairing correlations in the cuprates: a numerical study of the three-band Hubbard model

no code implementations26 Jan 2021 Peizhi Mai, Giovanni Balduzzi, Steven Johnston, Thomas A. Maier

We study the three-band Hubbard model for the copper oxide plane of the high-temperature superconducting cuprates using determinant quantum Monte Carlo and the dynamical cluster approximation (DCA) and provide a comprehensive view of the pairing correlations in this model using these methods.

Superconductivity Strongly Correlated Electrons

Polaron and bipolaron tendencies in a semiclassical model for hole-doped bismuthates

no code implementations3 Dec 2020 Mi Jiang, George A. Sawatzky, Mona Berciu, Steven Johnston

We demonstrate the existence of a (bi)polaron correlations that persists in the model at high temperatures and for hole doping away from the bond-disproportionated insulating phase.

Strongly Correlated Electrons Superconductivity

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