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@davidasivak.bsky.social

Professor & Canada Research Chair @SFUPhysics Nonequilibrium statistical biophysics

114 Followers  |  90 Following  |  31 Posts  |  Joined: 17.11.2024
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Posts by (@davidasivak.bsky.social)

Reminder of the upcoming abstract deadline (March 7) for the Workshop on Stochastic Thermodynamics!

27.02.2026 16:11 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Out today in @physrevresearch.bsky.social: "Information Thermodynamics of Cellular Ion Pumps", led by JuliΓ‘n JimΓ©nez-Paz (@cornelluniversity.bsky.social), with @davidasivak.bsky.social (@sfuphysics.bsky.social)!

10.02.2026 16:54 β€” πŸ‘ 9    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0

This design modularizes the functions of fluctuation harvesting and energy storage, pointing to its incorporation in more practical devices.

28.01.2026 17:19 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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He elegantly shows how to convert horizontal thermal jiggles (β€˜fluctuations’) into vertically raising a weight against gravity. Remarkably, the horizontal fluctuations are more valuable than the vertical ones!

(image credit: Jasper Zhang)

28.01.2026 17:19 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Harnessing Higher-Dimensional Fluctuations in an Information Engine We study the optimal performance of an information engine consisting of an overdamped Brownian bead confined in a controllable, $d$-dimensional harmonic trap and additionally subjected to gravity. The...

Out in @physrevlett.bsky.social: @sfuphysics.bsky.social postdoc Antonio PatrΓ³n Castro (in tight collaboration with my colleague John Bechhoefer) pushes our information engine to higher dimensions!
doi.org/10.1103/xwjd...

28.01.2026 17:19 β€” πŸ‘ 6    πŸ” 4    πŸ’¬ 1    πŸ“Œ 0
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Workshop on Stochastic Thermodynamics An online platform for the stochastic thermodynamics community to present and discuss their current research

Detailed information, including invited speakers: wostmeeting.org
Abstract submission (deadline March 7): tinyurl.com/yjzxxxt7
Registration (deadline May 17): tinyurl.com/z8cup9fx

22.01.2026 16:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The seventh annual Workshop on Stochastic Thermodynamics (WOST VII) will be held May 18-22, 2026. This workshop is entirely online and free to attend. 10-minute lightning talks will be chosen from 1-page abstracts, with priority given to early-career researchers.

22.01.2026 16:59 β€” πŸ‘ 5    πŸ” 2    πŸ’¬ 1    πŸ“Œ 1

Kudos @mleighton.bsky.social

20.01.2026 17:21 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Any partial control (say through a few control parameters) is easily derived as a submanifold of this global manifold. Through this we can tractably compare hundreds of different control sets to identify sparse methods for efficient control.

08.01.2026 14:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

From this we derived decompositions of the metric tensor that drastically improve numerical calculation (replacing infinite-time integration with matrix multiplication) and connect driving costs to undriven dynamics (through projection of control protocols onto underlying dynamical modes)

08.01.2026 14:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

We formulated a global thermodynamic manifold whose metric tensor quantifies the dissipation associated with complete dynamic control of a system’s energy landscape

08.01.2026 14:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Global thermodynamic manifold for conservative control of stochastic systems Optimal control of stochastic systems plays a central role in nonequilibrium physics, with applications in the study of biological molecular motors and the design of single-molecule experiments. While...

Out in @physrevresearch.bsky.social: beautiful and fundamental theory from @sfuphysics.bsky.social PhD student @jrsawchuk.bsky.social
doi.org/10.1103/j59j...

08.01.2026 14:29 β€” πŸ‘ 3    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0
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Launch of new Canada Impact+ Research Training Awards As announced in Budget 2025 -

Interested in the intersection of nonequilibrium thermodynamics and biophysics? Think Canada might be a nice place for your PhD/postdoc? Talk to me! Brand-new funding opportunity has quick deadline (so likely undersubscribed). nserc-crsng.canada.ca/en/news/laun...
SFU internal deadline Feb 11

06.01.2026 14:04 β€” πŸ‘ 6    πŸ” 4    πŸ’¬ 1    πŸ“Œ 0
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Canada Impact+ Research Chairs

Come be my colleague @SFU ! Call is out for Canada Impact+ Research Chairs (Assoc Prof/Prof stage)
www.sfu.ca/vpacademic/a...
Rolling review of initial applications begins Jan 19

18.12.2025 18:57 β€” πŸ‘ 3    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

@biophyscanada.bsky.social

05.12.2025 17:54 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Employment Opportunities

Applications received by January 15, 2026 will receive full consideration. For a full description and application instructions, see
www.sfu.ca/physics/abou...

Ping me if you want to discuss!

05.12.2025 17:54 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

We’re hiring!

The Department of Physics
@sfuphysics.bsky.social
at Simon Fraser U (in beautiful and vibrant Vancouver) seeks applications for an Assistant or Associate Professor in Experimental Biophysics, encompassing all scales of life from molecules to ecosystems.
@sfuscience.bsky.social

05.12.2025 17:54 β€” πŸ‘ 15    πŸ” 9    πŸ’¬ 1    πŸ“Œ 0

Out in @physreve.bsky.social:
@sfuphysics.bsky.social MSc student Sara Iranbakhsh reveals how symmetry mismatch between the components of nanoscale rotary motors affects their performance
doi.org/10.1103/k85p...
@sfuscience.bsky.social

26.11.2025 15:42 β€” πŸ‘ 7    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

This was a stimulating and thoroughly enjoyable melding of experiment and theory. Special salute to lead author Takahide Mishima and the rest of Shoichi Toyabe’s group at Tohoku, former postdoc Deepak Gupta, and current grad student Callum Wareham @sfuphysics.bsky.social @sfuscience.bsky.social

06.10.2025 13:48 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Efficiently Driving ${\mathrm{F}}_{1}$ Molecular Motor in Experiment by Suppressing Nonequilibrium Variation Turning a biologically important molecular motor at a constant rate saves energy, according to experiments.

Is it more efficient to push a molecular motor with a constant force, or at a constant velocity? See our collaborative paper in @physrevlett.bsky.social
doi.org/10.1103/b24h...
and the Focus article
physics.aps.org/articles/v18...
to learn the winner and the why (it’s all about the fluctuations).

06.10.2025 13:48 β€” πŸ‘ 4    πŸ” 3    πŸ’¬ 1    πŸ“Œ 0
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Johann du Buisson, Jannik Ehrich, mleighton.bsky.social, davidasivak.bsky.social, and John Bechhoefer introduce a one-coordinate test that infers heat flow to flag β€œdemonic” operation. In kinesin simulations tuned to experiments, the motor grows more demon-like as active fluctuations rise.

27.09.2025 15:00 β€” πŸ‘ 2    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0

Still accepting postdoc applications!

24.06.2025 16:56 β€” πŸ‘ 3    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0
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New preprint out today: β€œInformation Thermodynamics of Cellular Ion Pumps”. Led by talented undergraduate student JuliΓ‘n JimΓ©nez-Paz, and working with @davidasivak.bsky.social, we explore the thermodynamics of cellular ion pumps like the sodium-potassium pump.

arxiv.org/abs/2506.11248

17.06.2025 16:18 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 1    πŸ“Œ 1
Multiparameter optimal control of ${\mathrm{F}}_{1}$-ATPase Biological molecular machines convert free energy between different forms in cells, often at high efficiency. Optimal control theory provides a framework to elucidate design principles governing energ...

Fun new paper by Callum @sfuphysics.bsky.social, on energetically efficient multi-parameter driving of our favorite molecular motor (shout out F1!).
doi.org/10.1103/bm3d...

11.06.2025 14:34 β€” πŸ‘ 3    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

Congratulations to Matt on his Convocation Medal!

10.06.2025 17:08 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Canada Excellence Research Chairs (CERC) 2026 Competition

Deadline June 30 for initial application. Happy to discuss. Details: tinyurl.com/4zkdasr9

09.06.2025 16:32 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

@sfuscience.bsky.social in Vancouver seeks world-leading applicants in strategic areas that include Biophysics (featuring an internationally recognized and highly collaborative group of researchers centered in @sfuphysics.bsky.social).

09.06.2025 16:32 β€” πŸ‘ 3    πŸ” 5    πŸ’¬ 1    πŸ“Œ 0

Canada Excellence Research Chairs offer $4-8M over eight years to build a world-class research focus.

09.06.2025 16:32 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
Postdoc Ad

Postdoc opportunity!
Join us in heavenly Vancouver (Canada) to develop fundamental nonequilibrium stat mech, thermo, and info theory applied to biomolecular machines and in close collaboration with experiment.
Details: www.sfu.ca/physics/siva...

02.06.2025 15:11 β€” πŸ‘ 4    πŸ” 4    πŸ’¬ 0    πŸ“Œ 2

Kudos to Matt for his complete leadership from start to finish on this review, which was invited as a result of his compelling, cohesive, and ground-breaking graduate research!

12.05.2025 15:18 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0