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feat: Adding direct btbt by Hurkx and Impact ionization by Selberherr
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‎CHANGELOG.md‎

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@@ -58,6 +58,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- A new type of doping box has been introduced, `CustomDoping` which accepts a `SpatialDataArray` to define doping concentration. Unlike in the case where a `SpatialDataArray`, custom doping defined with `CustomDoping` have additive behavior, i.e., one can add other doping on top. This deprecates the `SpatialDataArray` as direct input for `N_a` and `N_d`.
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- Non-isothermal Charge simulations are now available. One can now run this type of simulations by using the `SteadyChargeDCAnalysis` as the `analysis_spec` of a `HeatChargeSimulation`. This type of simulations couple the heat equation with the drift-diffusion equations which allow to account for self heating behavior.
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- Because non-isothermal Charge simulations are now supported, new models for the effective density of states and bandgap energy have been introduced. These models are the following: `ConstantEffectiveDOS`, `IsotropicEffectiveDOS`, `MultiValleyEffectiveDOS`, `DualValleyEffectiveDOS`.
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- Added the Hurkx model for direct band-to-band tunneling `HurkxDirectBandToBandTunneling`.
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- Added Selberherr's model for impact ionization `SelberherrImpactIonization`.
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### Changed
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- `LayerRefinementSpec` defaults to assuming structures made of different materials are interior-disjoint for more efficient mesh generation.

‎docs/api/charge/mediums.rst‎

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tidy3d.ShockleyReedHallRecombination
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tidy3d.FossumCarrierLifetime
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tidy3d.DistributedGeneration
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tidy3d.HurkxDirectBandToBandTunneling
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Doping

‎schemas/EMESimulation.json‎

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‎schemas/HeatChargeSimulation.json‎

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