Kamil Walczak

Fryderyk Chopin University of Music

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Katarzyna Szmyt

Fryderyk Chopin University of Music

Maciej Superson

Fryderyk Chopin University of Music

Katarzyna Szymańska

Fryderyk Chopin University of Music

Julia Krasnoborska

Klaudia Wilk-Trytko

Fryderyk Chopin University of Music

Sylwia Samojedny

Fryderyk Chopin University of Music

Avik W. Ghosh

University of Virginia

Kirk L. Yerkes

United States Air Force Research Laboratory

Rita Aghjayan

Smitha Vasudevan

University of Virginia

Cooperative Institutions

University of Virginia

University of Cambridge

Fryderyk Chopin University of Music

Wright-Patterson Air Force Base

United States Air Force Research Laboratory

National Institute of Standards and Technology

McCormick (United States)

Purdue University West Lafayette

Rzeszów University

Silesian University of Technology

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Nonlinearities and Noise-Signal Relations in Electronic Heat Transport via Molecules

arXiv (Cornell University) (2016)

Arthur Luniewski Rita Aghjayan Kamil Walczak

We examine the electronic heat transport phenomena in nanoscale junctions composed of organic molecules coupled to two metallic reservoirs of different temperatures. The electronic heat flux and its dynamical noise properties are calculated within the scattering (Landauer) formalism with the transmission probability determined by using non-equilibrium Green's functions (NEGF technique). The method based on Taylor series expansion is used to determine nonlinear corrections to the electronic heat flux and its noise power spectral density with up to the second order terms with respect to the temperature difference. Our results show only limited applicability of ballistic Fourier's law and fluctuation-dissipation theorem to heat transport in molecular systems. We derived and tested numerically several signal-signal, noise-signal, and noise-noise relations applicable to nanoscale heat flow carried by electrons at strongly non-equilibrium conditions (similar formulas are expected for phonons and photons). Importantly, the special treatment proposed by us may be extended to higher order terms in order to address a variety of problems related to nonlinear thermal and electro-thermal effects which may occur at nanoscale.

Fluctuation-dissipation theorem

Heat current

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Citations (3)

Nonlinear Transport and Noise Properties of Acoustic Phonons

Bulletin of the American Physical Society (2016)

Kamil Walczak

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Citations (1)

Transient Heat Flow Effects at Nanoscale

Bulletin of the American Physical Society (2017)

Rita Aghjayan Kamil Walczak

Transient (computer programming)

Transient flow

Heat flow

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Transient Heat Conduction in Strongly Correlated Systems

Bulletin of the American Physical Society (2015)

Rita Aghjayan Arthur Luniewski Kamil Walczak

Transient (computer programming)

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Reversible current blockade of carbon nanotube through well resolved multitrap-interactions

Bulletin of the American Physical Society (2009)

Tsz Wah Chan Smitha Vasudevan Brian Burke Kenny Evans Kamil Walczak

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Thermal and Shot Noises Generated by Hot Electrons in Quantum-Interference Devices

Bulletin of the American Physical Society (2018)

Omar Tsoutiev Kamil Walczak

Quantum interference

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The role of quantum interference in determining transport properties of molecular bridges

Open Chemistry (2004)

Kamil Walczak

Abstract An analytical approach to the electron transport phenomena in molecular devices is presented. The analyzed devices are composed of various molecular bridges attached to two semi-infinite electrodes. Molecular system is described within the tight-binding model, while the coupling to the electrodes is analyzed through the use of Newns-Anderson chemisorption theory. The current-voltage (I-V) characteristics are calculated through the integration of transmission function in the standard Landauer formulation. The essential question of quantum interference effect of electron waves is diseussed in three aspects: (i) the geometry of a molecular bridge, (ii) the presence of an external magnetic field and (iii) the location of chemical substituent.

Molecular wire

Chemisorption

Quantum interference

Bridge (graph theory)

10.2478/bf02476205

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Citations (57)

Applications of gene modification technologies in the treatment of inherited diseases

Journal of Education Health and Sport (2024)

Maciej Superson Katarzyna Szmyt Klaudia Wilk-Trytko Julia Krasnoborska Sylwia Samojedny

Introduction and Purpose: In last years gene modification technologies such as CRISPR/Cas9 has had a revolutionary impact on the treatment of inherited diseases. Technologies developed from bacterial defense mechanisms, has become a basic tools in scientific research and medical therapies. In our article we provided an overview of applications of gene modifications technologies, directly focusing on CRISPR/Cas9, in genetic disease treatment. State of Knowledge: New applications of CRISPR/Cas9 are still being explored. Treating inherited diseases such as cystic fibrosis, Duchenne muscular dystrophy, thalassemia, hemophilia, Huntington's disease, Crigler-Najjar syndrome, sickle cell anemia, Marfan syndrome, and phenylketonuria, is feasible with this novel technique. A comparative analysis with other gene editing methods highlights CRISPR/Cas9's efficacy, ease of use, and multiplexing capabilities. Summary: CRISPR/Cas9 is a groundbreaking technology with broad applications in genetic research and therapy. Its ease of use, cost-effectiveness, and ability to target multiple genes simultaneously position it as a preferred method. However, there are some challenges associated with precision issues and ethical considerations in human embryo gene editing. As CRISPR/Cas9 continues to evolve, responsible application and ethical considerations are important for maximizing its potential in treatment of genetic diseases.

10.12775/jehs.2024.66.002

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Polaronic transport through DNA molecules

Materials Science (2007)

M. Sidowski Kamil Walczak

We present results of theoretical studies on polaronic and incoherent transport through a DNA-based junction. Decoherence itself is modelled through the use of an imaginary dephasing potential. Nonperturbative computational scheme, used in this work, is based on Green’s functions within the framework of the so-called polaron transformation (GFT-PT). This method maps exactly the many-body hole –phonon interaction problem into a one-body multi-channel scattering problem, where the availability of particular conduction channels is determined by an appropriate weight factor. The results obtained for poly(dG)-poly(dC) DNA molecule reveal saturation effect of the current at high voltages, where for short chains we establish an exponential DNA length dependence. Besides, we document strong coupling and exponential dephasing dependences of the maximum current.

Dephasing

Exponential decay

Saturation (graph theory)

Phonon scattering

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Low temperature electrical transport in modified carbon nanotube fibres

Scripta Materialia (2015)

Agnieszka Łękawa-Raus Kamil Walczak Gregory Kozlowski Simon C. Hopkins Mariusz Woźniak

Atmospheric temperature range

10.1016/j.scriptamat.2015.04.029