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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:26.0pt;font-family:"Times New Roman",serif">Condensed Matter Seminar</span></b></span><o:p></o:p></p>
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</span><i><span style="font-size:26.0pt;font-family:"Times New Roman",serif">Exchange-bias-driven and Interaction-driven Quantum Anomalous Hall Effect in Topological Insulator Heterostructures</span></i><span style="font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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</span><span class="m-642861739458883080normaltextrun"><b><i><span style="font-size:28.0pt;font-family:"Times New Roman",serif">Dr. Chao-Xing Liu</span></i></b></span><span style="font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:28.0pt;font-family:"Times New Roman",serif">Department of Physics, Pennsylvania State University, University Park<o:p></o:p></span></b></span></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:28.0pt"> </span></b></span><span class="m-642861739458883080normaltextrun"><b><span style="font-size:28.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></b></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif">Abstract: Quantum anomalous Hall (QAH) state is a magnetic topological state with zero longitudinal resistance and quantized Hall resistance, occurring in the absence of external magnetic fields
due to spontaneously broken time-reversal symmetry. The QAH effect has now been realized in several different classes of two-dimensional materials, including magnetically (Cr or V) doped (Bi,Sb)2Te3, MnBi2Te4, and Moire materials of graphene and transition
metal dichalcogenides. Despite of the impressive progress, the temperature at which the QAH effect is observed is still limited to a few Kelvins. Two general approaches are expected to enhance this critical temperature [1]: (1) high-quality heterostructures
between topological insulators and high Curie temperature ferromagnetic insulator; and (2) new Moire systems. In this talk, I will describe our theoretical efforts along these directions. (1) The strong exchange bias between MnBi2Te4 and CrI3 can give rise
to the electrically tunable QAH effect in MnBi2Te4/CrI3 heterostructure [2]. (2) Isolated topologically non-trivial Moire mini-bands can be formed for a topological insulator film under a Moire superlattice and Coulomb interaction can drive this system into
the QAH state when the non-trivial Moire mini-band is half filled.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif">[1] Cui-Zu Chang, Chao-Xing Liu, Allan H. MacDonald, Colloquium: Quantum anomalous Hall effect, Reviews of Modern Physics, 2023, 95(1): 011002.<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif">[2] Fu H, Liu C X, Yan B. Exchange bias and quantum anomalous Hall effect in the MnBi2Te4/CrI3 heterostructure[J]. Science advances, 2020, 6(10): eaaz0948.<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif">[3] Z2-Nontrivial Moiré Minibands and Interaction-Driven Quantum Anomalous Hall Insulators in Topological Insulator Based Moiré Heterostructures, Kaijie Yang, Zian Xu, Yanjie Feng, Frank Schindler, Yuanfeng
Xu, Zhen Bi, B. Andrei Bernevig, Peizhe Tang, Chao-Xing Liu, arXiv:2304.09907, 2023.<o:p></o:p></span></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">Wednesday, May 31st, 2023</span></b></span><span class="m-642861739458883080normaltextrun"><o:p></o:p></span></p>
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<span class="m-642861739458883080normaltextrun"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">4:00 PM in the Reading Room (Physics 3035)<o:p></o:p></span></b></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Heather McDermott</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Physics & Astronomy Dept.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">University of California Riverside</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ph: 951-827-6169</span><o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:heatherm@ucr.edu"><span style="font-size:11.0pt;color:#0563C1">heatherm@ucr.edu</span></a><o:p></o:p></p>
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