Adding the switch for rotating the vacuum layer direction of 2D material to x direction to accelerate the calculation

[xdzhu]

Background

For two-dimensional system in ABACUS, the parallel computation is faster along the x direction. However, the vacuum layer is set in the z direction in common two-dimensional material modeling.

Describe the solution you'd like

Thus, I suggest that ABACUS can add a switch that automatically switches the direction of the vacuum layer to x direction internally. Before calculating the electronic structure, the structure is internally converted to the x direction, and then ABACUS carry out the calculation. When all calculations are done, ABACUS transforms all output results to the original z direction.

Additional Context

No response

[mohanchen]

We will consider that.

[hongriTianqi]

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