http://libtreasures.utdallas.edu/xmlui/bitstream/handle/10735.1/4175/NSM-FR-FZhang-271294.23.pdf?sequence=1
Dirac and Weyl Superconductors in Three Dimensions It looks like both Dirac and Weyl semimetals are superconductors. Magnetic field will affect them with respect of their quasiparticles. On Mon, Aug 29, 2016 at 9:34 PM, Axil Axil <janap...@gmail.com> wrote: > http://arxiv.org/pdf/1412.6543.pdf > > The chiral magnetic effect is the generation of electric current induced > by chirality imbalance in the presence of magnetic field. It is a > macroscopic manifestation of the quantum anomaly1,2 in relativistic field > theory of chiral fermions (massless spin 1/2 particles with a definite > projection of spin on momentum) – a dramatic phenomenon arising from a > collective motion of particles and antiparticles in the Dirac sea. The > recent discovery3–5 of Dirac semimetals with chiral quasi-particles opens a > fascinating possibility to study this phenomenon in condensed matter > experiments. Here we report on the first observation of chiral magnetic > effect through the measurement of magneto-transport in* zirconium > pentatelluride, ZrTe5*. Our angle-resolved photoemission spectroscopy > experiments show that this material’s electronic structure is consistent > with a 3D Dirac semimetal. We observe a large negative magnetoresistance > when magnetic field is parallel with the current. The measured quadratic > field dependence of the magnetoconductance is a clear indication of the > chiral magnetic effect. The observed phenomenon stems from the effective > transmutation of *Dirac semimetal into a Weyl semimetal* induced by the > parallel electric and magnetic fields that represent a topologically > nontrivial gauge field background. > > I had it backward, the magnetic field produces Weyl quasiparticles, > > On Mon, Aug 29, 2016 at 9:26 PM, John Berry <berry.joh...@gmail.com> > wrote: > >> "zirconium pentatelluride,ZrTe5, that provides strong evidence for the >> chiral magnetic effect:. >> >> My research is all based on chirality of coils that produce fundamentally >> different "currents". >> >> This is no doubt closely related to my work! >> >> On Tue, Aug 30, 2016 at 1:23 PM, John Berry <berry.joh...@gmail.com> >> wrote: >> >>> "This is because in ZrTe5 the electrons responsible for the current >>> have no mass." >>> >>> That itself sounds like a dramatic claim, electrons with no mass? >>> >>> I am able to produce a current of something that I believe is like an >>> electron albeit not propperly physical, and I believe it gains something by >>> moving through magnetic fields. >>> >>> I think I might be moving something akin to a virtual electron, albeit >>> one that does not have the correct quanta to manifest physically to regular >>> meters, but can be readily detected by a significant percentage of the >>> population including in conditions outside of any possible >>> conventional explanation like the Placebo effect. >>> >>> But there is another current in the reverse direction that is denser and >>> appears to be more like a proton. >>> >>> John >>> >>> On Tue, Aug 30, 2016 at 11:58 AM, Jack Cole <jcol...@gmail.com> wrote: >>> >>>> Electrons with no mass acquire a mass in the presence of a high >>>> magnetic field >>>> >>>> http://flip.it/bkDC21 >>>> >>> >>> >> >
