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Search Publications by: Michael Zwolak (Fed)

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Displaying 26 - 50 of 68

Topology, Landscapes, and Biomolecular Energy Transport

October 11, 2019
Author(s)
Justin E. Elenewski, Kirill Velizhanin, Michael P. Zwolak
While ubiquitous, energy redistribution remains a poorly understood facet of the nonequilibrium thermodynamics of biomolecules. At the molecular level, finite-size effects, pronounced nonlinearities, and ballistic processes conspire to produce behavior

Revealing the emergence of classicality in nitrogen-vacancy centers

October 1, 2019
Author(s)
Thomas Unden, Daniel Louzon, Michael P. Zwolak, Wojciech Zurek, Fedor Jelezko
The origin of classical behavior of quantum systems is a long-standing mystery. Here, we examine a nitrogen vacancy center evolving naturally in the presence of its environment to study the proliferation of information about preferred quantum states via

Optimal transport and colossal ionic mechano-conductance in graphene crown ethers

July 12, 2019
Author(s)
Subin Sahu, Justin E. Elenewski, Christoph Rohmann, Michael P. Zwolak
Biological ion channels balance electrostatics and hydration, yielding large ion selectivities alongside high transport rates. These macromolecular systems are often interrogated through point mutations of their pore domain, limiting the scope of

Colloquium: Ionic phenomena in nanoscale pores through 2D materials

June 27, 2019
Author(s)
Subin Sahu, Michael P. Zwolak
Ion transport through channels and nanoscale pores cuts across many disciplines, from single- molecule sensing to pharmacology and cellular physiology to battery and fuel cell technologies. Two-dimensional materials, such as graphene, MoS$_2$, and

An energy-resolved atomic scanning probe

November 21, 2018
Author(s)
Daniel S. Gruss, Chih-Chun Chien, Julio T. Barreiro, Massimiliano Di Ventra, Michael P. Zwolak
The density of states is a concept that is ubiquitous in classical and quantum physics, since it quantifies the energy distribution of states available in a system. Spectroscopic means allow its measurement over the entirety of a system's energy spectrum

A Spin-1 Representation for Dual-Funnel Energy Landscapes

July 20, 2018
Author(s)
Justin E. Elenewski, Kirill Velizhanin, Michael P. Zwolak
The interconversion between left- and right-handed helical folds of a polypeptide defines a dual-funneled free energy landscape. In this context, the funnel minima are connected through a continuum of unfolded conformations, evocative of the classical

Golden aspect ratio for ion transport simulation in nanopores

July 5, 2018
Author(s)
Subin Sahu, Michael P. Zwolak
Access resistance indicates how well current carriers from the bulk medium can converge to a pore or opening, and is important in many fields, such as cell biology, electronics, electrochemical engineering, thermal transport, among others. In simplified

Educational commitment and social networking: The power of informal networks

May 29, 2018
Author(s)
Justyna Zwolak, Michael P. Zwolak, Eric Brewe
Prior studies found that the lack of an engaging pedagogy and the highly competitive atmosphere in introductory science courses tend to discourage students from pursuing STEM (science, technology, engineering, and mathematics) majors. Once in a STEM field

Metastable morphological states of catalytic nanoparticles

March 1, 2018
Author(s)
Pin A. Lin, Bharath N. Natarajan, Michael P. Zwolak, Renu Sharma
During the catalytic synthesis of graphene, nanotubes, fibers, and other nanostructures, many intriguing phenomena occur, such as phase separation, precipitation, and processes similar to capillary action. The underlying mechanism of these processes and

Maxwell-Hall access resistance in graphene nanopores

January 24, 2018
Author(s)
Subin Sahu, Michael P. Zwolak
The resistance due to the convergence from bulk to a constriction -- e.g., a nanopore -- is a mainstay of transport phenomena. In classical electrical conduction, Maxwell -- and later Hall for ionic conduction -- predicted this access or convergence