2017/07/31 by SK Firoz Islam, A. M. Jayannavar · 62 citations
Chemistry · Materials Science · Physics and Astronomy · #Anisotropy #Chemistry #Condensed matter physics #Electric field #Electrical resistivity and conductivity #Graphene research and applications #Magnetic field #Oscillation (cell signaling) #Physics #Polarization (electrochemistry) #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.96.235405
published in Physical review. B./Physical review. B 96(23) (American Physical Society) · To appear in Physical Review B
arxiv created 2017/11/22 · openalex created_date 2017/12/04 · openalex publication_date 2017/12/05 · arxiv updated 2017/12/13 · openalex updated_date 2026/08/05
Polymorph of 8\ensuremath-Pmmn borophene exhibits anisotropic tilted Dirac cones. In this work, we explore the consequences of the tilted Dirac cones in magnetotransport properties of a periodically modulated borophene. We evaluate modulation-induced diffusive conductivity by using linear response theory in low temperature regime. The application of weak spatial modulation (electric, magnetic or both) gives rise to the magnetic-field-dependent nonzero oscillatory drift velocity which causes Weiss oscillation in the longitudinal conductivity at low magnetic field. The Weiss oscillation is studied in the presence of a weak spatial electric, magnetic, and both modulations individually. The tilting of the Dirac cones gives rise to an additional contribution to the Weiss oscillation in longitudinal conductivity. Moreover, it also enhances the frequency of the Weiss oscillation and modifies its amplitude too. Most remarkably, it is found that the presence of both out-of-phase electric and magnetic modulations can cause a sizable valley polarization in diffusive conductivity. The origin of valley polarization lies in the opposite tilting of the two Dirac cones at two valleys.