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# Stephen W. Teitsworth

*Associate Professor of Physics*

Prof. Stephen Teitsworth's research centers on theoretical and experimental studies of noise-driven processes in far-from-equilibrium systems. Recent activity has centered around the development and implementation of novel metrics such as stochastic area which allow one to quantify how far from equilibrium a system is. These concepts have been developed and applied to low dimensional systems such as mechanical mass-spring assemblies and coupled electronic circuits driven by out-of-equilibrium noise sources.

Two problems of current interest are: 1) the extension of the stochastic area and related concepts to high-dimensional spatially continuous systems such as elastic filaments (e.g., strings or rods) embedded in viscoelastic media and driven by active noise sources; 2) studies of first-passage processes associated with heating of trapped ions in Paul traps (in collaboration with the group of Prof. Noel at Duke).

## Appointments and Affiliations

- Associate Professor of Physics

## Contact Information

**Office Location:**089 Physics Bldg, Durham, NC 27708**Office Phone:**+1 919 660 2560**Email Address:**stephen.teitsworth@duke.edu

## Education

- Ph.D. Harvard University, 1986

## Research Interests

- Current research centers on theoretical and experimental investigations of fluctuation processes in noise-driven dynamical systems that are far from thermal equilibrium. Theoretical work focuses on the development of novel metrics for characterizing how far from equilibrium a system is. We focus on cases where established metrics such as entropy production rate may not be easily assessed, for example, in systems driven by non-thermal noises. We focus on metrics such as stochastic area and irreversibility fields which lead to generalizations of the fluctuation-dissipation relation. This work is motivated in part by an effort to understand experiments from a range of fields including biophysics (e.g., filaments embedded in viscoelastic networks with active noise sources), electronic transport (e.g., noise-driven electronic circuits and networks), and atomic physics (e.g., noise-driven trapped ions). Two problems of current interest are: 1) the extension of the stochastic area and related concepts to high-dimensional spatially continuous systems such as elastic filaments (e.g., strings or rods) embedded in viscoelastic media and driven by active noise sources; 2) studies of first-passage processes associated with heating of trapped ions in Paul traps (in collaboration with the group of Prof. Noel at Duke).

## Awards, Honors, and Distinctions

- Traditional Fulbright Scholarship. Council for International Exchange of Scholars. 1999

## Courses Taught

- PHYSICS 791: Special Readings
- PHYSICS 763: Statistical Mechanics
- PHYSICS 714: Quantum Mechanics 1
- PHYSICS 493: Research Independent Study
- PHYSICS 491: Independent Study: Advanced Topics
- PHYSICS 190S: Special Topics in Physics
- PHYSICS 137S: Energy in the 21st Century and Beyond

## Representative Publications

- Teitsworth, S; Neu, JC,
*Stochastic line integrals and stream functions as metrics of irreversibility and heat transfer.*, Physical review. E, vol 106 no. 2-1 (2022) [10.1103/physreve.106.024124] [abs]. - Teitsworth, SW; Olson, ME; Bomze, Y,
*Scaling properties of noise-induced switching in a bistable tunnel diode circuit*, European Physical Journal B, vol 92 no. 4 (2019) [10.1140/epjb/e2019-90711-0] [abs]. - Gonzalez, JP; Neu, JC; Teitsworth, SW,
*Experimental metrics for detection of detailed balance violation.*, Physical review. E, vol 99 no. 2-1 (2019) [10.1103/physreve.99.022143] [abs]. - Neu, JC; Ghanta, A; Teitsworth, SW,
*The Geometry of most probable trajectories in noise-driven dynamical systems*, Springer Proceedings in Mathematics and Statistics, vol 232 (2018), pp. 153-167 [10.1007/978-3-319-76599-0_9] [abs]. - Ghanta, A; Neu, JC; Teitsworth, S,
*Fluctuation loops in noise-driven linear dynamical systems.*, Physical review. E, vol 95 no. 3-1 (2017) [10.1103/physreve.95.032128] [abs].