
Abstract Kubo's thermal conductivity formula is simplified, and a number of expressions are obtained for the conductivity involving a single integral of the time correlation function of the thermal currents. These currents are worked out for a ferromagnetic spin system and it is shown that they are zero for the Ising model which must therefore have a zero thermal conductivity.
| citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 0 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
