Weyl fermions are massless chiral fermions embodying the mathematical concept of a Weyl spinor.
In the transport measurement, it generates a chiral magnetic current along the direction of electric and magnetic fields, resulting in an observable negative magnetoresistance.The above-mentioned scientists achieved the dynamic chiral anomaly by combining the built-in electric field of phonon and external static magnetic field.
0000024482 00000 n 290 90 0000025903 00000 n 0000015321 00000 n <<1670061AFA11404CB913D9A558501972>]/Prev 221340>> To gain a basic understanding of chiral anomaly, it is useful to go back to the generic low-energy model of Weyl semimetal, given by equation .
In a magnetic field, their Dirac cones split into two halves, one supporting left-handed and the other right-handed fermions. h�b``a`������ V� �� @1v�6�vn� �ױ~sDC.WNh3�@N�r���߃�i�t 0000005092 00000 n A sizable energy gap that depends sensitively on the direction of the magnetic field may open up due to the mixing of the zeroth Landau levels associated with the opposite-chirality Weyl points that are away from each other in the Brillouin zone.
Weyl semimetals provide the realization of Weyl fermions in solid-state physics. For simplicity, we will subsume the Fermi velocity v F in equation ( 3 ) into the definition of momentum and set the 'mass term' Δ = 0. 0000003625 00000 n Once the AC electric field generated by the lattice vibration is parallel to the external magnetic field, a dynamic axial chiral magnetic current can be generated. 0000023272 00000 n 0000005818 00000 n A Weyl semimetal is a material that hosts particles known as Weyl fermions.
Introduction. %PDF-1.4 %���� There has been no report of chiral anomaly under alternating electromagnetic fields, which reflects the unique electromagnetic response of Weyl semimetals.The electromagnetic response of the Weyl semimetal can be described by the axial θ E • B term (E and B are the electric and magnetic field, respectively).
0000018811 00000 n 0000002096 00000 n Free carrier spectral weight enhancement is measured directly for the first time, confirming theoretical expectations of chiral pumping. In addition to chiral anomaly, other electromagnetic responses of Weyl semimetals such as anomalous Hall effect can also be described by this axial field. Abstract Magnetotransport provides key experimental signatures in Weyl semimetals. doi: 10.1103/PhysRevLett.119.266401. As an analogy to the similar phenomenon in high-energy physics, the chiral anomaly in condensed matter is predicted to exist in the emergent quasiparticle excitations in Dirac and Weyl semimetals. This idea was first proposed by researcher Dai Xi. 0000006818 00000 n 0000023851 00000 n 0000004728 00000 n Epub 2019 Nov 26.Arnold F, Naumann M, Wu SC, Sun Y, Schmidt M, Borrmann H, Felser C, Yan B, Hassinger E.Phys Rev Lett. 0000010813 00000 n Using phonon related techniques, such as Raman spectroscopy and infrared spectroscopy, researchers first determined the phonon behavior in zero-field in Weyl semimetal NbAs (zero-field infrared spectroscopy is provided by Professor Wang Nanlin). 0000015607 00000 n 0000006064 00000 n 2016 Sep 30;117(14):146401. doi: 10.1103/PhysRevLett.117.146401.
GdPtBi and NdPtBi belong to the Heusler family of compounds and are conventional antiferromagnets below 9 and 2.1 K, respectively. 0000004605 00000 n 0000025649 00000 n
observed in type-II Weyl semimetals. 0000023969 00000 n The chiral symmetry will be broken under an external magnetic field, which causes chiral anomaly.
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chiral anomaly weyl semimetal