The PDF file includes:

• Fig. S1. 2D images showing the separation of the photoexcited electrons at the photoexcited carrier density of 2.1 × 10¹⁹ cm⁻³.
• Fig. S2. Distribution of dipoles before and after photoexcitation.
• Fig. S3. Partial screening of the built-in surface field.
• Fig. S4. Origin of the initial fast drop in the photoemission intensity.
• Fig. S5. Formation of the in-plane electric field.
• Fig. S6. Relative extents of the optical pulse penetration depths and the depletion width of the surface space charge region.
• Section S1. Partial screening of the built-in surface space charge field.
• Section S2. Formation of lateral electric field.
• Legend for Movies S1 to S2
• Reference (36)

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Gaussian electron distribution profile at low carrier density of 1.4 × 10¹⁸ cm⁻³.
• Movie S2 (.mp4 format). Redistribution of the photoexcited electrons at 2.1 × 10¹⁹ cm⁻³.