Is this topic something that Ayn Rand discuss in great detail in any of her books …?
No, she did not write a great deal, but she definitely addressed the issue explicitly, and unambiguously.
Ayn Rand used “material” synonymously with “physical.” Here are some quotes to consider:
“Man is an entity of mind and body, an indivisible union of two elements: of consciousness and matter. Matter is that which one perceives, consciousness is that which perceives it.” [The Journals of Ayn Rand, “14 - Notes While Writing Galt’s Speech”]
Notice the two elements are consciousness and matter, meant to identify two unique things. But she is more explicit here:
“Man’s consciousness is not material——but neither is it an element opposed to matter.” [The Journals of Ayn Rand, “13 - Notes While Writing: 1947-1952”] [Emphasis mine.]
And here:
“Man is a being endowed with consciousness —an attribute which matter does not possess. His consciousness is the free, nonmaterial element in him.” [The Letters of Ayn Rand, “The Fountainhead and Atlas Shrugged Years (1945-1959),” To Nathan Blumenthal, January 13, 1950] [Emphasis mine.]
There is no hint of either dualism or mysticism in Rand’s view. She regarded consciousness as part of nature, part of the objective metaphysical world, but not a physical or “material” part of it. This is, in fact, my own view, except that I regard three aspects of reality non-physical&mdash.life, consciousness, and the human mind (volition, rationality, and intellect), because none of these can be explained in terms of physical attributes, though none can exist independently of the physical organisms of which they are the life, consciousness, or minds.
I wonder if you know who Nathan Blumenthal is. He was married to Barbara Weidman.