Love this technique and the deeper hidden concepts associated with it.
If we analyse this technique in detail, we can see the splitting of the energy in the associated heaven and earth movements.

Example: starting in Hidari Hanmi. Perform a small shift/slide step to the left to take your self out of the range of attack or simply out of Uke‘s line (front of Uke). Tori keeps the left arm extended to the left knee (obove or slightly to the outside), this is the earth/ground concept. This simple movement keeps all of Uke‘s weight on his right leg, preventing him from moving his right leg. This followed by the step behind as Tori‘s hand raises to heaven (i.e Uke‘s shoulder and neck area). Then as if emptying a cup behind Uke‘s back completes the throw.

This as described above is the basic Tenchinage  of Aikido.

Taking it one step further and using the concept of trapping Uke‘s weight on on left makes it easy to take Uke‘s balance and can be used to perform Osoto-gari for example ( can be any type of grip). Or we can use it to take Uke to the ground if we wished to do some BJJ work. I have showed this technique/concept to my Students and they love it. As a side note. We can use the Earth concept of the throw to take Uke to the ground and the heaven part if just the gravy if needed.