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Advanced Physics Homework Help
Statistical physics. Density matrix
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[QUOTE="LagrangeEuler, post: 5464800, member: 413477"] [h2]Homework Statement[/h2] A system is subject to Hamiltonian ##\hat{H}=-\gamma B_z \hat{S}_z##. Write down the density matrix.[/B][h2]Homework Equations[/h2] For canonical ensemble ##\hat{\rho}=\frac{1}{Tr(e^{-\beta \hat{H}})}e^{-\beta \hat{H}}## In general ##\rho=\sum_m |\psi_m\rangle \langle \psi_m|## [h2]The Attempt at a Solution[/h2] How to know which definition of density matrix to use? Thanks. [/QUOTE]
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Statistical physics. Density matrix
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