Magnetophotoluminescence in GaAs/AlAs core-multishell nanowires: A theoretical investigation

Abstract

The magnetophotoluminescence in modulation doped core-multishell nanowires is predicted as a function of photoexcitation intensity in nonperturbative transverse magnetic fields. We use a self-consistent field approach within the effective mass approximation to determine the photoexcited electron and hole populations, including the complex composition and anisotropic geometry of the nanomaterial. The evolution of the photoluminescence is analyzed as a function of (i) photoexcitation power, (ii) magnetic field intensity, (iii) type of doping, and (iv) anisotropy with respect to field orientation.

Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires

“…The numerical simulations of the PL peaks diamagnetic shift were performed by computing the single-particle electron and hole confined energies by means of a box integration method in the 3D domains shown in the insets of Fig. 3 (b) [53], including an orthogonal magnetic field. An effective-mass two-band model was used, with a NW radius of 80 nm and the following InP effective masses: * = 0.064, ℎ [37].…”

“…(b)[53], including an orthogonal magnetic field. An effective-mass two-band model was used, with a NW radius of 80 nm and the following InPeffective masses: 𝑚𝑚 𝑒𝑒 * = 0.064, 𝑚𝑚 ℎ[100] * = 0.52, 𝑚𝑚 ℎ[111] * = 0.95 for the ZB region, and 𝑚𝑚 𝑒𝑒[1000] * = 0.073 , 𝑚𝑚 𝑒𝑒[0001] * = 0.064 , 𝑚𝑚 ℎ[1000] * = 0.14 , 𝑚𝑚 ℎ[0001] *…”

Corner and side localization of electrons in irregular hexagonal semiconductor shells

“…Due to the crystallographic structure the cross section of such wires is usually hexagonal [1][2][3][4][5][6][7], but other shapes like triangles [8][9][10][11][12][13][14] or dodecagons [15] have already been obtained. These radial heterojunctions have been in the focus of extensive experimental [4][5][6][7][16][17][18][19][20][21] and theoretical [22][23][24] studies in the recent years. This is mostly due to the possibility of controlling some of their physical properties, e.g., the band alignment.…”

Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors

“…In particular, the effect of electrostatic interactions on the properties of the normal electronic states in core–shell nanowires can be important. The effect of interactions should be calculated using a Schrödinger–Poisson scheme, e.g., like in [ 55 ], to take into account both the interface potential between the core and the shell, and the presence of the carrier density in the shell. In addition, for Majorana devices, one should incorporate the effects due to the presence of a parent superconductor, including the work function difference between the superconductor and the semiconductor, as well as the effects generated by gate-induced electric fields.…”