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【Read between lines】Hal Tasaki "Physics and Mathematics of Quantum Many-Body Systems" p. 501 (Problem 3.4.a: Evaluation of a commutator of finite-range interactions)
Key wordsfinite-range interaction evaluation by inequality Relevant sectionNote that $${[\hat{o}_z, [\hat{h}_x, \hat{o}_y]]\neq0}$$ only when $${|x-y|\leq r}$$ and $${|x-z|\leq 2r}$$. For a fixed $${x}$$, the numbers of such $${y}$$ and
【Read between lines】Hal Tasaki "Physics and mathematics of quantum many body systems" p. 44 (proof of Marshal-Lieb-Mattis theorem generalized to antiferromagnetic Heisenberg model with anisotropy)
KeywordsMarshal-Lieb-Mattis theorem Antiferromagnetic Heisenberg model with anisotropy Perron-Frobenius theorem to a real-symmetric matrix SolutionsOverview Since Hamiltonian commutes with $${\hat{S}_\mathrm{tot}^{(3)}}$$, we can take
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【Read between lines】Hal Tasaki "Physics and mathematics of quantum many body systems" p. 496 (Problem 2.4.a: uniqueness in each M sector of ferromagnetic ground state via Perron-Frobenius theorem)
Key WordsPerron-Frobenius theorem A complete description of ground states for ferromagnetic system Relevant sectionIt suffices to show the uniqueness of ground state in each $${\mathscr{H}_M}$$ . This is easily done by applying the Perro
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