Electronic interference transport and its electron–phonon interaction in the Sb-doped Bi₂Se₃nanoplates synthesized by a solvothermal method

Abstract

Abstract. Based on the Floquet scattering theory, we analytically investigate the topological spin pumping for an exactly solvable model. Floquet spin Chern numbers are introduced to characterize the periodically time-dependent system. The topological spin pumping remains robust both in the presence and in the absence of the timereversal symmetry, as long as the pumping frequency is smaller than the band gap, where the electron transport involves only the Floquet evanescent modes in the pump. For the pumping frequency greater than the band gap, where the propagating modes in the pump participate in the electron transport, the spin pumping rate decays rapidly, marking the end of the topological pumping regime.

Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes

“…Such an unintentional doping effect also occurs in the samples grown by molecular beam epitaxy and the melting method [35][36][37] , preventing the material (x = 0) from being an ideal MTI for QAHE measurements. Encouraged by some previous successes [41][42][43][44][45] , we investigate the whole family of Mn(SbxBi(1-x))2Te4 by increasing the value of x in the search for the ideal bulk-insulating MTI. Shiny plate-like Mn(SbxBi(1-x))2Te4 crystals could still be obtained following a similar growth process (inset of Fig.…”

Weakly interacting topological insulators: Quantum criticality and the renormalization group approach

“…The precise form of V q will be discussed in later sections. The second is the electron-phonon interaction [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59], which has been a realistic issue, for instance on the transport of surface states. To examine the perturbative approach, we consider a polar coupling between spinless fermions and a longitudinal optical phonon mode, described by the Fröhlich Hamiltonian [60]…”

A supervised learning algorithm for interacting topological insulators based on local curvature

“…As electron-phonon interactions are ubiquitous in real materials and can affect properties such as transport of surface states, we now consider the impact of such interactions on the Chern insulator [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. In particular, we consider the deformation potential coupling between an acoustic phonon mode and spinless fermions of the form [57]…”