tag:blogger.com,1999:blog-13869903.post433254906505091764..comments2024-03-28T04:15:44.459-05:00Comments on nanoscale views: This week in cond-matDouglas Natelsonhttp://www.blogger.com/profile/13340091255404229559noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-13869903.post-20212932021650796592009-07-05T20:00:25.480-05:002009-07-05T20:00:25.480-05:00Hehe, reading "Fröhlich superconducting quant...Hehe, reading "Fröhlich superconducting quantum device" I can't help thinking (at least at first, before I switch my physics mind on) "Cheerful superconducting quantum device".Schlupphttps://www.blogger.com/profile/16399256701731431557noreply@blogger.comtag:blogger.com,1999:blog-13869903.post-90783293246461046942009-07-02T16:09:53.711-05:002009-07-02T16:09:53.711-05:00Dave - I'm sure someone has already called up ...Dave - I'm sure someone has already called up DARPA....<br /><br />Anon. - The peak in the Fourier transform of resistance vs. 1/B (the insets to their Fig. 2) look pretty well defined, comparable to what is seen in other mesoscopic experiments in normal metal rings (at much lower T and much smaller circumference). The apparent need for the high bias would be to un-pin the CDW. Clearly if the CDW is pinned and there's basically no CDW current, one would not expect oscillations. Note that the required bias is quite a bit lower at 79 K, consistent with this idea.<br /><br />It's a very interesting question, how to think about what that applied bias voltage is doing. In ordinary mesoscopics, an applied bias that big would make me worry about both heating and smearing due to energy averaging. Here, it's less obvious. <br /><br />I'd love to see the oscillations over a much larger range of magnetic fields. If the oscillations continue over tens of Gauss, that would be more persuasive, at least to me.Douglas Natelsonhttps://www.blogger.com/profile/13340091255404229559noreply@blogger.comtag:blogger.com,1999:blog-13869903.post-60193728162225294152009-07-02T14:47:00.557-05:002009-07-02T14:47:00.557-05:00The results are very surprizing. How can the state...The results are very surprizing. How can the states be coherent over 100 microns or so at nitrogen temperature? The AB oscillations appear when applying a voltage larger than 200 mV. This is really too large.<br /><br />Maybe I do not know enough about CDW and the measurements make sense. However, the quality of the oscillations is not spectacular and not convincing.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13869903.post-15328240697528129992009-07-02T10:23:59.106-05:002009-07-02T10:23:59.106-05:00Cue proposals to build a quantum computer out of t...Cue proposals to build a quantum computer out of the system in 3...2...1Dave Baconhttps://www.blogger.com/profile/03506030153326411733noreply@blogger.com