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Related Experiment Video

Updated: Jan 20, 2026

Non-ohmic Devices

Non-ohmic Devices

Ohmic-Polarization transition in hydrated DNA.

Mariusz Pietruszka¹

¹University of Silesia, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, 40-032 Katowice, Poland.

|January 18, 2026

Summary

DNA-water systems exhibit a novel polarization-coherent state under magnetic fields. Cooling induces a transition from charge conduction to polarization dynamics, generating voltages without net charge flow.

Keywords:

Collective dipolar dynamics DNA-water matrix Displacement current Field-induced transition Fröhlich coherence Photovoltage Soft-matter electrodynamics Transverse voltage

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Area of Science:

Condensed Matter Physics
Biophysics
Materials Science

Background:

Understanding charge transport in quasi-two-dimensional (quasi-2D) DNA-water systems is crucial for bioelectronic applications.
Conventional models often assume ohmic conduction, which may not fully capture complex dynamics under external fields.

Purpose of the Study:

To investigate the electrical and optical properties of a quasi-2D DNA-water system under a perpendicular magnetic field and bias.
To elucidate the underlying transport mechanisms and identify novel electronic regimes.

Main Methods:

Experimental investigation of a quasi-2D DNA-water system using a 0.5T perpendicular magnetic field and 0.1V bias.
Temperature-dependent measurements near room temperature (approx. 20 °C).
Magnetic-field sweeps on higher-concentration samples.

Main Results:

A sharp crossover near 20 °C was observed, transitioning from finite longitudinal conduction to collapsed current (Ixx).
Transverse voltage (Vxy) and photovoltage (Vphoto) remained finite and showed coherent modulations, indicating polarization-dominated dynamics.
Magnetic-field sweeps revealed a reproducible polarization cycle with Vxy/Vphoto inversion and anti-phase locking.

Conclusions:

The system exhibits a field-tunable, polarization-coherent regime in hydrated DNA under ambient conditions.
Macroscopic voltages arise from collective polarization dynamics, not net charge flow, challenging conventional transport theories.
This discovery opens new avenues for DNA-based electronic devices operating under biological conditions.