Quantum transport and shot noise in two-dimensional semi-Dirac system

Two-dimensional (2D) semi-Dirac systems, such as 2D black phosphorus and arsenene, can exhibit a rich topological phase transition between insulating, semi-Dirac, and band inversion phases when subjected to an external modulation. How these phase transitions manifest within the quantum transport and shot noise signatures remains an open question thus far. Here, we show that the Fano factor converges to the universal F approximate to 0.179 at the semi-Dirac phase and transits between the sub-Poissonian (F approximate to 1/3) and the Poissonian shot noise (F approximate to 1) limit at the band inversion and the insulating phase, respectively. Furthermore, the conductance of a 2D semi-Dirac system converges to the contrasting limit of G/G(0) 1/d and G/G(0) -> 0 at the band inversion and the insulating phases, respectively. The quantum tunneling spectra exhibits a peculiar coexistence of massless and massive Dirac quasiparticles in the band inversion regime, thus providing a versatile sandbox to study the tunneling behavior of various Dirac quasiparticles. These findings reveal the rich interplay between band topology and quantum transport signatures, which may serve as smoking gun signatures for the experimental studies of semi-Dirac systems near the topological phase transition. (C) 2023 Author(s).

Automated summary

Two-dimensional semi-Dirac systems undergo topological phase transitions between insulating, semi-Dirac, and band inversion phases under external modulation. The behavior of quantum transport and shot noise signatures during these transitions is still unknown.