The electrodynamics of metals is well understood within the Drude conductivity model; properties of insulators and semiconductors are governed by a gap in the electronic states. But there is a great variety of disordered materials that do not fall in these categories and still respond to external field in an amazingly uniform manner. At radiofrequencies delocalized charges yield a frequency-independent conductivity σ 1(ν) whose magnitude exponentially decreases while cooling. With increasing frequency, dispersionless conductivity starts to reveal a power-law dependence σ 1(ν)∝ν s with s < 1 caused by hopping charge carriers. At low temperatures, such Universal Dielectric Response can cross over to another universal regime with nearly constant loss ε″∝σ1/ν = const. The powerful research potential based on such universalities is widely used in condensed matter physics. Here we study the broad-band (1-1012 Hz) dielectric response of Shewanella oneidensis MR-1 extracellular matrix, cytochrome C and serum albumin. Applying concepts of condensed matter physics, we identify transport mechanisms and a number of energy, time, frequency, spatial and temperature scales in these biological objects, which can provide us with deeper insight into the protein dynamics.

1 Physikalisches Institut Universität Stuttgart Stuttgart Germany

A M Prokhorov General Physics Institute RAS Moscow Russia

Institute for Metallic Materials IFW Dresden Dresden Germany

Institute of Physics AS CR Praha 8 Czech Republic

Moscow Institute of Physics and Technology Dolgoprudny Moscow Region Russia

Moscow Institute of Physics and Technology Institutsky lane 9 Dolgoprudny Moscow 141701 Russia

Scientific Center of Russian Federation Research Institute for Genetics and Selection of Industrial Microorganisms Moscow Russia

Southern Federal University Rostov on Don Russia

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