The role of coherent elastic neutrino scattering on graphene nuclei in Neutrinovoltaic power generation technology
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The role of coherent elastic neutrino scattering by graphene nuclei (Coherent Elastic Neutrino-Nucleus Scattering, CevNS) in the theoretical justification of the possibility of Neutrinovoltaic power generation from invisible radiation fields is difficult to overestimate.
Physical Essence of CEvNS
The process was theoretically predicted by David Friedman in 1973. CEvNS is the interaction of a neutrino with the atomic nucleus as a whole, rather than with individual nucleons (protons and neutrons).
Key Characteristics
For a neutrino to coherently elastically scatter by atomic nuclei, its de Broglie wavelength must be larger than the size of the atomic nucleus. In this situation, the scattering amplitudes add coherently, and the effective scattering cross section becomes proportional to the square of the number of nucleons N², significantly enhancing the very weak interaction of a single particle. This is precisely why microscopic energy can be detected at the macroscopic level.
Experiments performed using the Coherent, PandaX-4T, and SuperKamiokande facilities confirmed the existence and quantitatively measured the process of coherent neutrino scattering by nuclei (CEνNS), creating a reliable experimental basis for studying momentum transfer.
Coherence: a neutrino interacts with all nucleons in a nucleus simultaneously. This is possible when the neutrino wavelength is comparable to the size of the nucleus (a condition met at relatively low neutrino energies—up to 50 MeV for heavy nuclei).
Elasticity: a neutrino's energy remains virtually unchanged; it merely changes direction. The nucleus receives only a small recoil momentum.
Weak interaction: the process is mediated by the exchange of the Z0 boson (neutral current).
Mechanism of the process
Interaction: A neutrino exchanges a virtual Z0 boson with a carbon nucleus in graphene.
Momentum Transfer: The nucleus receives recoil momentum, causing it to shift slightly. The recoil energy Er lies in the eV–keV range.
Lattice Vibrations: The displacement of the nucleus excites phonons—quantized vibrations of the graphene crystal lattice.
Charge Carrier Generation: The energy of the phonons is transferred to the graphene electrons, creating electron-hole pairs.
Current Harvesting: Under the influence of an external electric field (or the built-in potential in the heterostructure), the charge carriers drift, generating a measurable electric current.
The Role of Graphene in the Process
Graphene is ideal for CEvNS detection due to its unique properties:
Two-dimensional structure: The carbon atoms are aligned in a single plane, maximizing the probability of interaction with the neutrino flux.
Linear energy spectrum: the conduction and valence bands touch at the Dirac points (K and K' in the Brillouin zone), resulting in massless behavior of the quasiparticles. This facilitates carrier excitation even at low recoil energies.
High carrier mobility at room temperature, reducing scattering losses.
Delocalized π-electron system: the fourth valence electron of each carbon atom is located in an unhybridized p-orbital perpendicular to the plane. This creates a highly mobile conducting medium.
Enhancement of the effect in real devices
In practical implementations (e.g., Neutrinovoltaic technologies), multilayer heterostructures are used:
Alternating layers: graphene/silicon/dopants (12–20 layers on a metal substrate). This increases the interaction area and enhances energy absorption.
Nanostructuring: Using graphene nanoribbons or quantum dots to localize the field and enhance absorption.
External fields: Applying electric or magnetic fields to control carrier transport.
In real Neutrinovoltaic devices, CEvNS does not operate alone, but complements other mechanisms: piezoelectric, triboelectric, flexoelectric, and thermoelectric effects complement CEvNS, increasing the overall conversion efficiency.
Effects:
Piezoelectric: Converts mechanical stress into current. Phonons from CEvNS enhance lattice deformation.
Triboelectric: Generates charge by friction between layers. CEvNS enhances localized oscillations, increasing friction.
Flexoelectric: Creates polarization under strain gradients. CEvNS excites strain gradients in nanostructures.
Thermoelectric: Converts heat into current. Phonons from CEvNS contribute to the heat flux
Total Effect
Although the recoil energy in a single CEvNS event is extremely small (∼ eV), the enormous flux of neutrinos (solar, atmospheric, and cosmic) provides an integral effect:
Billions of weak interactions add up to a macroscopic current.
The system operates as a multichannel converter, collecting energy from various sources (neutrinos, muons, electromagnetic fields, thermal fluctuations).
Design Features of Neutrinovoltaic Devices
To maximize the CEvNS contribution, the devices are designed with the following features:
Multilayer heterostructures (graphene/silicon/dopants):
increase the interaction area;
create internal fields for carrier collection;
enhance phonon modes.
Nanostructuring (quantum dots, nanoribbons):
localizes the fields, increasing the probability of CEvNS;
creates quantum effects that facilitate carrier generation.
Materials Optimization
Graphene — high carrier mobility, linear dispersion;
Silicon — good lattice matching, piezoelectric properties;
Dopants (e.g., doped silicon) — create built-in potentials.
External fields (electric, magnetic):
direct carrier drift;
can resonantly enhance CEvNS at certain frequencies.
Conclusion: CEvNS on graphene cores is a promising mechanism for creating fuel-free energy sources. The unique properties of graphene allow for the efficient conversion of neutrino energy into electric current, and multilayer heterostructures enhance this effect to a practically significant level.
Authors: Holger Thorsten Schubart, Doctor of Economics, L.K. Rumyantsev, Ph.D.
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