Spin–exciton interaction and related micro-photoluminescence spectra of ZnSe:Mn DMS nanoribbon

Abstract

For their spintronic applications the magnetic and optical properties of diluted magnetic semiconductors (DMS) have been studied widely. However, the exact relationships between the magnetic interactions and optical emission behaviors in DMS are not well understood yet due to their complicated microstructural and compositional characters from different growth and preparation techniques. Manganese (Mn) doped ZnSe nanoribbons with high quality were obtained by using the chemical vapor deposition (CVD) method. Successful Mn ion doping in a single ZnSe nanoribbon was identified by elemental energy-dispersive x-ray spectroscopy mapping and micro-photoluminescence (PL) mapping of intrinsic d-d optical transition at 580 nm, i.e. the transition of T( G) → A( s),. Besides the d-d transition PL peak at 580 nm, two other PL peaks related to Mn ion aggregates in the ZnSe lattice were detected at 664 nm and 530 nm, which were assigned to the d-d transitions from the Mn-Mn pairs with ferromagnetic (FM) coupling and antiferromagnetic (AFM) coupling, respectively. Moreover, AFM pair formation goes along with strong coupling with acoustic phonon or structural defects. These arguments were supported by temperature-dependent PL spectra, power-dependent PL lifetimes, and first-principle calculations. Due to the ferromagnetic pair existence, an exciton magnetic polaron (EMP) is formed and emits at 460 nm. Defect existence favors the AFM pair, which also can account for its giant enhancement of spin-orbital coupling and the spin Hall effect observed in PRL 97, 126603(2006) and PRL 96, 196404(2006). These emission results of DMS reflect their relation to local sp-d hybridization, spin-spin magnetic coupling, exciton-spin or phonon interactions covering structural relaxations. This kind of material can be used to study the exciton-spin interaction and may find applications in spin-related photonic devices besides spintronics.

Tunable Emission Properties of Manganese Chloride Small Single Crystals by Pyridine Incorporation

“…In a previous report, we have found that the ferromagnetic coupling between Mn ions in a semiconductor lattice can lead to a red-shifted d–d transition, even in ionic crystal MnBr 2 . 14,29 Therefore, the d–d red-shifted emission band has a similar origin out of the ferromagnetically coupled pair in the C 5 H 6 NMnCl 3 ·H 2 O, and we need to verify if C 5 H 6 NMnCl 3 ·H 2 O with the emission band at 620 nm has ferromagnetic behavior. 30−32…”

The aggregation of Fe3+ and their d–d radiative transitions in ZnSe:Fe3+ nanobelts by CVD growth

“…3(a) ions, which is in agreement with that reported for ZnSe:Mn nanoribbons. 6 The simplied diagram of the formation of AFM and FM is shown in Fig. 4.…”

“…4,5 It is also reported that the Mn ion antiferromagnetic pair emission near the stacking faults occurred in ZnSe:Mn nanoribbon with complicated electronic states and also, various properties were introduced. 6 Furthermore, Bhattacharjee proposed the coupling of magnetic polaron associated with an electron-hole pair, which is called "EMP". 7 The EMP emission located at 460 nm was observed in ZnSe:Mn DMS nanoribbon 6 and the EMP lasing has been observed in the Co(II)-doped CdS nanobelts.…”

Formation of Mn doped CH3NH3PbBr3perovskite microrods and their collective EMP lasing

“…The temperature dependent PL spectra for Mn doped CH 3 NH 3 PbBr 3 single microrod have been shown in figure S4, their bandedge shift with temperature according to the Varshni function, which is identified to be in relation to the clear electron-LO-phonon coupling. The FX and EMP have a same tendency for their couplings with LO phonons, which is in contrast to the no shift of the emission energy of the bound magnetic polaron with temperatures in different DMS [11,17,29].…”