U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Michael Zwolak (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 1 - 25 of 34

Dual current anomalies and quantum transport within extended reservoir simulations

October 19, 2021
Author(s)
Gabriela Wojtowicz, Justin E. Elenewski, Marek Rams, Michael P. Zwolak
Quantum transport simulations are rapidly evolving, including the development of well–controlled tensor network techniques for many– body transport calculations. One particularly powerful approach combines matrix product states with extended reservoirs —

Performance of Reservoir Discretizations in Quantum Transport Simulations

September 29, 2021
Author(s)
Justin E. Elenewski, Gabriela Wojtowicz, Marek Rams, Michael P. Zwolak
Quantum transport simulations require a level of discretization, often achieved through an explicit representation of the electronic reservoirs. These representations should converge to the same continuum limit, though there is a trade-off between a given

Failure mechanisms in DNA self-assembly: Barriers to single fold yield

February 23, 2021
Author(s)
Jacob Majikes, Paul Patrone, Anthony J. Kearsley, Michael P. Zwolak, James Liddle
Understanding the folding process of DNA origami is a critical steppingstone to the broader implementation of nucleic acid nanofabrication technology but is notably non-trivial. Origami are formed by several hundred cooperative hybridization events – folds

Revealing thermodynamics of DNA origami folding via affine transformations

June 4, 2020
Author(s)
Jacob M. Majikes, Paul N. Patrone, Daniel R. Schiffels, Michael P. Zwolak, Anthony J. Kearsley, Samuel P. Forry, James A. Liddle
Structural DNA nanotechnology, as exemplified by DNA origami, has enabled the design and construction of molecularly precise objects for a myriad of applications. However, limitations in imaging, and other characterization approaches, make a quantitative

Open-system tensor networks and Kramers' crossover for quantum transport

May 12, 2020
Author(s)
Gabriela Wojtowicz, Justin E. Elenewski, Marek Rams, Michael P. Zwolak
Tensor networks are a powerful tool for many-body ground-states with limited entanglement. These methods can nonetheless fail for certain time-dependent processes - such as quantum trans- port or quenches - where entanglement growth is linear in time

Metal adsorbate interactions and the convergence of density functional calculations

February 10, 2020
Author(s)
Christoph Rohmann, Maicol A. Ochoa, Michael P. Zwolak
The adsorption of metal atoms on nanostructures, such as graphene and nanotubes, plays an important role in catalysis, electronic doping, and tuning material properties. Quantum chemical calculations permit the investigation of this process to discover

Optimal in situ electromechanical sensing of molecular species

January 21, 2020
Author(s)
Maicol A. Ochoa, Michael P. Zwolak
We investigate protocols for optimal molecular detection with electromechanical nanoscale sensors in ambient conditions. Our models are representative of suspended graphene nanoribbons, which due to their piezoelectric and electronic properties, provide

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