The key of E minor is the relative of G major and contains the “F#” accordingly. However, because the Harmonic minor scale can be thought of as altered, it actually contains two sharps. The other is D#. Below, the E Harmonic minor scale is pictured.
In the next picture we see the chords that are created by the addition of the “D#” to the scale.
Here, the key is shown with guitar diagrams added.