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Related: How will crystal orientation affect the mobility? (I separate one question out. I wrote my understanding of the concept there, but I am not sure if it is accurate.)

We know that crystal orientation will affect the mobility. What is crystal orientation, in particular for 2d crystals? Is there a basic textbook/lecture explaining this concept?

hkl (and hk for 2d crystals). are Miller Indices Geometry of Crystals for crystal planes, right? Is it the same as, or sufficient to describe, crystal orientation?

Charlie Chang
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The orientation in this context is the direction of motion of the electron with respect to the crystal structure. This is typically discussed in terms of a state in reciprocal (“k”) space. An applied electric field is usually parallel to the electron motion and could be used as a stand-in directional reference (no so for any version of the Hall effect). The substrate is irrelevant to the question of orientation.

Gilbert
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