Atomic-Scale Magnetism of Cr-Doped Bi2Se3 Thin Film Topological Insulators

ACS Nano
Wenqing LiuKang L Wang

Abstract

Magnetic doping is the most common method for breaking time-reversal-symmetry surface states of topological insulators (TIs) to realize novel physical phenomena and to create beneficial technological applications. Here we present a study of the magnetic coupling of a prototype magnetic TI, that is, Cr-doped Bi2Se3, in its ultrathin limit which is expected to give rise to quantum anomalous Hall (QAH) effect. The high quality Bi2-xCrxSe3 epitaxial thin film was prepared using molecular beam epitaxy (MBE), characterized with scanning transimission electron microscopy (STEM), electrical magnetotransport, and X-ray magnetic circularly dichroism (XMCD) techniques, and the results were simulated using density functional theory (DFT) with spin-orbit coupling (SOC). We observed a sizable spin moment mspin = (2.05 ± 0.20) μB/Cr and a small and negative orbital moment morb = (-0.05 ± 0.02) μB/Cr of the Bi1.94Cr0.06Se3 thin film at 2.5 K. A remarkable fraction of the (CrBi-CrI)(3+) antiferromagnetic dimer in the Bi2-xCrxSe3 for 0.02 < x < 0.40 was obtained using first-principles simulations, which was neglected in previous studies. The spontaneous coexistence of ferro- and antiferromagnetic Cr defects in Bi2-xCrxSe3 explains our experiment...Continue Reading

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Citations

Dec 15, 2015·ACS Nano·Hugo Menezes do Nascimento VasconcelosFranck Vidal
Feb 19, 2016·ACS Applied Materials & Interfaces·Wenqing LiuGerrit van der Laan
May 26, 2016·Scientific Reports·A GhasemiV K Lazarov
May 31, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ada Della PiaGiovanni Costantini
Mar 15, 2018·Physical Chemistry Chemical Physics : PCCP·Turgut YilmazBoris Sinkovic
Feb 21, 2019·Science Advances·Wenqing LiuKang Wang
Apr 27, 2021·The Journal of Physical Chemistry Letters·Rikizo YanoSatoshi Kashiwaya
May 5, 2021·Nature Communications·Xiaoqian ZhangYongbing Xu

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