tag:blogger.com,1999:blog-13869903.post4272899262493359168..comments2024-03-28T04:15:44.459-05:00Comments on nanoscale views: One PRL/arxiv paperDouglas Natelsonhttp://www.blogger.com/profile/13340091255404229559noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-13869903.post-91502346415043934262008-02-06T08:32:00.000-06:002008-02-06T08:32:00.000-06:00Hi Alison - You're right that there are analogous ...Hi Alison - You're right that there are analogous coupling coefficients such as the spin diffusion length, etc. Still, the spin-Hall effect is a clear example of a situation where it is possible to build up a gradient of spin without a net gradient of charge. I'm still not sure that I am happy with the way I think about these phenomena. The main differences, to me, between spin transport and thermoelectric phenomena are (1) the fact that excess spin population can be both created and destroyed, unlike the one-way street of the second law; (2) spin-orbit couplings can lead to really nontrivial effects; and (3) in principle, with localized charges but exchange interactions you can still get spin flow.Douglas Natelsonhttps://www.blogger.com/profile/13340091255404229559noreply@blogger.comtag:blogger.com,1999:blog-13869903.post-47864909714840463552008-02-04T19:37:00.000-06:002008-02-04T19:37:00.000-06:00Wouldn't diffuse spins necessarily drag charges al...Wouldn't diffuse spins necessarily drag charges along just as charges drag entropy along in thermoelectric phenomena? It seems to me that there should be an entire set of analogous coupling coefficients. After all, the spins belong to electrons, and the electrons have a band structure.Anonymousnoreply@blogger.com