Diamagnetism of nodal fermions
| dc.creator | Ghosal, Amit | |
| dc.creator | Goswami, Pallab | |
| dc.creator | Chakravarty, Sudip | |
| dc.date | 2006-11-28 | |
| dc.date.accessioned | 2026-07-07T07:52:59Z | |
| dc.date.available | 2026-07-07T07:52:59Z | |
| dc.description | Free nodal fermionic excitations are simple but interesting examples of fermionic quantum criticality in which the dynamic critical exponent $z=1$, and the quasiparticles are well defined. They arise in a number of physical contexts. We derive the scaling form of the diamagnetic susceptibility, $χ$, at finite temperatures and for finite chemical potential. From measurements in graphene, or in $\mathrm{Bi_{1-x}Sb_{x}}$ ($x=0.04$), one may be able to infer the striking Landau diamagnetic susceptibility of the system at the quantum critical point. Although the quasiparticles in the mean field description of the proposed $d$-density wave (DDW) condensate in high temperature superconductors is another example of nodal quasiparticles, the crossover from the high temperature behavior to the quantum critical behavior takes place at a far lower temperature due to the reduction of the velocity scale from the fermi velocity $v_{F}$ in graphene to $\sqrt{v_{F}v_{\mathrm{DDW}}}$, where $v_{\mathrm{DDW}}$ is the velocity in the direction orthogonal to the nodal direction at the Fermi point of the spectra of the DDW condensate. | |
| dc.description | 11 pages, 2 eps figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0611695 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0611695 | |
| dc.identifier | Phys. Rev. B 75, 115123 (2007) | |
| dc.identifier | doi:10.1103/PhysRevB.75.115123 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/126084 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Diamagnetism of nodal fermions | |
| dc.type | text |