Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany.
Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada.
Phys Rev Lett. 2018 Oct 12;121(15):157602. doi: 10.1103/PhysRevLett.121.157602.
We present the quantum critical theory of an interacting nodal Fermi liquid of quasirelativistic pseudospin-3/2 fermions that have a noninteracting birefringent spectrum with two distinct Fermi velocities. When such quasiparticles interact with gapless bosonic degrees of freedom that mediate either the long-range Coulomb interaction or its short range component (responsible for spontaneous symmetry breaking), in the deep infrared or quantum critical regime in two dimensions, the system is, respectively, described by a marginal- or a non-Fermi liquid of relativistic spin-1/2 fermions (possessing a unique velocity), and is always a marginal Fermi liquid in three dimensions. We consider a possible generalization of these scenarios to fermions with an arbitrary half-odd-integer spin, and conjecture that critical spin-1/2 excitations represent a superuniversal description of the entire family of interacting quasirelativistic fermions.
我们提出了一个相互作用的节线费米液体的量子临界理论，该理论涉及具有两个不同费米速度的准相对论赝自旋-3/2 费米子。当这些准粒子与无能隙玻色自由度相互作用时，这些玻色自由度可以是长程库仑相互作用或其短程分量（负责自发对称破缺），在二维的深红外或量子临界区域，系统分别由相对论自旋-1/2 费米子的边缘或非费米液体（具有独特的速度）描述，在三维中始终是边缘费米液体。我们考虑了这些情况对任意半整数自旋费米子的可能推广，并推测临界自旋-1/2 激发代表相互作用的准相对论费米子整个家族的超普遍描述。
