First Principles Calculations of Electron Transport and Structural Damage by Intense Irradiation

• First principle electronic structure theory is used to describe the effect of crystal binding on radiation detectors, electron transport properties, and structural damage induced by intense irradiation. A large database containing general electronic structure results to which data mining algorithms can be applied in the search for new functional materials, a case study is presented for scintillator detector materials. Inelastic cross sections for the generation of secondary electron cascades through impact ionization are derived from the dielectric response of an electron gas and evolved in time with Molecular Dynamics (MD). Qualitative and quantitive estimates are presented for the excitation and relaxation of a sample irradiated with Free Electron Laser pulses. A study is presented in where the structural damage on covalent bonded crystals following intense irradiation is derived from a Tight Binding approach and evolved in time with MD in where the evolution of the sample is derived from GW theory for the quasiparticle spectra and a dedicated Boltzmann transport equation for the impact ionization.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Condense matter theory

electronic structure

quasiparticles

GW theory

molecular dynamics

Boltzmann transport

electron transport

impact ionization

structural damage

dielectric response

structural biology

radiation detectors

scintillators

positron emission tommography

Electronic structure

Elektronstruktur

Semiconductor physics

Halvledarfysik

Biological physics

Biologisk fysik

Critical phenomena (phase transitions)

Kritiska fenomen (fasövergångar)

Functional materials

Funktionella material

Materiefysik

Physics of Matter

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