Mn²⁺‐Doped CdSe Quantum Dots: New Inorganic Materials for Spin‐Electronics and Spin‐Photonics

Abstract

Recent advances in the chemistry of colloidal semiconductor nanocrystal doping have led to new materials showing fascinating physical properties of potential technological importance. This article provides an overview of efforts to dope one of the most widely studied colloidal semiconductor nanocrystal systems, CdSe quantum dots, with one of the most widely studied transition‐metal dopant ions, Mn2+, and describes the major new physical properties that have emerged following successful synthesis of this material. These properties include spin‐polarizable excitonic photoluminescence, magnetic circular dichroism, exciton storage, and excitonic magnetic polaron formation. A brief survey of parallel advances in the characterization of analogous self‐assembled Mn2+‐doped quantum dots grown by molecular beam epitaxy is also presented, and the physical properties of the colloidal quantum dots are shown to compare favorably with those of the self‐assembled quantum dots. The rich variety of physical properties displayed by colloidal Mn2+‐doped CdSe quantum dots highlights the attractiveness of this material for future fundamental and applied research.

Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots

“…[1][2][3][4] Compared to their bulk counterparts, [5][6][7][8][9] magnetically doped semiconductor QDs could provide control of the magnetic ordering, [10][11][12][13][14][15][16] with the onset of magnetization at substantially higher temperatures. [17][18][19][20][21] Experiments typically focus on Mn-doped II-VI and III-V QDs, in which it is possible to include both single [22][23][24][25] and several magnetic impurities, [17][18][19][20][21][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] having similarities with nuclear spins. 41,42 In the first case (single magnetic ion), such systems could be considered as potential quantum bits, quantum memories, or probes to detect an unconventional orbital ordering.…”

Effects of dopants on the band structure of quantum dots: A theoretical and experimental study

“…Since that time, countless reports have been targeted on novel synthetic techniques for doping QDs 2-5 as well as detailed studies regarding the effects that chemical dopants have on QD properties [6][7][8] . Recently, groups have reported methods for making n-or p-type QDs 9,10 , primarily for improving electrical characteristics of the materials.…”

Magneto-Optical Properties of CdMnTe Diluted Magnetic Semiconductor Nanoparticles Prepared by Physical Methods

“…Подібна тенденція зменшення ступеня поляризації спостерігалась експериментально як для колоїдних розчинів наночастинок Cd 1-х Mn х Se [18,19] так і для нанокристалів, отриманих методом молекулярно-пучкової епітаксії [20]. Така поведінка зумовлена механізмом екситонної спін -граткової релаксації, який зростає при зростанні спін -спінової обмінної взаємодій [19,21] у квазінульвимірних структурах магніторозчинених напівпровідників.…”