Migdal Effect in Semiconductors.

  title={Migdal Effect in Semiconductors.},
  author={Simon Knapen and Jonathan Kozaczuk and Tongyan Lin},
  journal={Physical review letters},
  volume={127 8},
When a nucleus in an atom undergoes a collision, there is a small probability of an electron being excited inelastically as a result of the Migdal effect. In this Letter, we present the first complete derivation of the Migdal effect from dark matter-nucleus scattering in semiconductors, which also accounts for multiphonon production. The rate of the Migdal effect can be expressed in terms of the energy loss function of the material, which we calculate with density functional theory methods… 

Figures from this paper

The Migdal effect in semiconductors for dark matter with masses below ∼ 100 MeV

Dark matter scattering off a nucleus has a small probability of inducing an observable ionization through the inelastic excitation of an electron, called the Migdal effect. We use an effective field

Phonon-mediated Migdal effect in semiconductor detectors

The Migdal effect inside detectors provides a new possibility of probing the sub-GeV dark matter (DM) particles. While there has been well-established methods treating the Migdal effect in isolated

2022 A phonon-mediated description of the Migdal effect in semiconductor detectors

The Migdal effect inside detectors provides a new possibility of probing the sub-GeV dark matter (DM) particles. While there has been well-established methods treating the Migdal effect in gas and

Describing the Migdal effect with a bremsstrahlung-like process and many-body effects

Recent theoretical studies have suggested that the suddenly recoiled atom struck by dark matter (DM) particle is much more likely to excite or lose its electrons than expected. Such Migdal effect

Precise predictions and new insights for atomic ionization from the Migdal effect

The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. We revisit and improve upon previous

Can sub-GeV dark matter coherently scatter on the electrons in the atom?

A novel detection of sub-GeV dark matter is proposed in the paper. The electron cloud is boosted by the dark matter and emits an electron when it is dragged back by the heavy nucleus, namely the

In-medium screening effects for the Galactic halo and solar-reflected dark matter detection in semiconductor targets

Recently, the importance of the electronic many-body effect in the dark matter (DM) detection has been recognized and a coherent formulation of the DM-electron scattering in terms of the dielectric

Determining Dark-Matter-Electron Scattering Rates from the Dielectric Function.

We show that the rate for dark-matter-electron scattering in an arbitrary material is determined by an experimentally measurable quantity, the complex dielectric function, for any dark matter

python package for dark matter scattering in dielectric targets

We present a python package to calculate interaction rates of light dark matter in dielectric materials, including screening effects. The full response of the material is parametrized in the terms of

Revisiting the fermionic dark matter absorption on electron target

We perform a systematic study of the fermionic DM absorption interactions on electron target in the context of effective field theory. The fermionic DM absorption is not just sensitive to sub-MeV DM



Relation between the Migdal Effect and Dark Matter-Electron Scattering in Isolated Atoms and Semiconductors.

It is shown that the theoretical description of both processes is closely related, allowing for a principal mapping between them, and, for the first time, the Migdal effect in semiconductors using a crystal form factor is estimated.

Model-independent determination of the Migdal effect via photoabsorption

The Migdal effect in a dark-matter-nucleus scattering extends the direct search experiments to the sub-GeV mass region through electron ionization with sub-keV detection thresholds. In this paper, we

Multiphonon excitations from dark matter scattering in crystals

For direct detection of sub-MeV dark matter, a promising strategy is to search for individual phonon excitations in a crystal. We perform an analytic calculation of the rate for light dark matter

Dark matter phonon coupling

Generically, the effective coupling between the dark matter and an atom scales with the number of constituents in the atom, resulting in the effective coupling being proportional to the mass of the

Migdal effect and photon Bremsstrahlung: improving the sensitivity to light dark matter of liquid argon experiments

The search for dark matter weakly interacting massive particles with noble liquids has probed masses down and below a GeV/c2. The ultimate limit is represented by the experimental threshold on the

Erratum: Multiphonon excitations from dark matter scattering in crystals [Phys. Rev. D 101 , 036006 (2020)]

In the original evaluation for the paper, a second term given by perturbation theory in the anharmonic rate calculation was not included. Thus, Eq. (A6) for the transition rate is modified to include

The effect of high momentum transfer on scattering from oscillators and crystals

We examine two aspects of scattering at high energy and momentum transfer; asymptotic forms of scattering laws and comparison of approximate and exact results for a particular system, a harmonic

Detection capability of the Migdal effect for argon and xenon nuclei with position-sensitive gaseous detectors

The Migdal effect is attracting interest because of the potential to enhance the sensitivities of direct dark matter searches to the low-mass region. In spite of its great importance, the Migdal