tag:blogger.com,1999:blog-34480619.post8648179245184541157..comments2024-03-11T13:47:03.621-05:00Comments on Physics and Physicists: Fractional Hall Effect Observed in GrapheneZapperZhttp://www.blogger.com/profile/15861398273820851809noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-34480619.post-48818267015364167222009-10-16T16:18:51.389-05:002009-10-16T16:18:51.389-05:00An issue I have with this work is they keep callin...An issue I have with this work is they keep calling it the fractional quantum Hall EFFECT and yet it's a two-terminal measurement. There's a difference between the FQHE and a FQH state. I don't consider this measurement as a measurement of the FQHE since the FQHE, by definition I would think, is a plateau in the Hall resistance R_xy and a concomitant vanishing (as T approaches 0) of the longitudinal resistance R_xx. This two-terminal measurement does not independently measure these things. I think Andrei (and Philip Kim has seen FQHE in graphene too) should be claiming an observation of FQH STATES in graphene. Specifically, the 1/3 FQH state.<br /><br />I know...I'm being anal retentive...but at least in principle they could be measuring a non-plateaued R_xy and a non-vanishing R_xx that are conspiring in just the right way to produce a plateau at 1/3. I know it's very very unlikely...but hey...this is physics and it's possible.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-34480619.post-54294086563472014452009-10-15T12:19:46.240-05:002009-10-15T12:19:46.240-05:00One difference with the high Tc's, or most oth...One difference with the high Tc's, or most other materials, is that there we discover fundamental new states of matter, while in graphene everything gets predicted before it is observed. So graphene may be interesting for applications and a good playground for theoreticians, but that is not the same as saying that it will change our understanding of nature.Heumpjehttps://www.blogger.com/profile/01993462463863993238noreply@blogger.com