BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Chaoxing Liu\, Penn State University\n\n
A grand challenge in the field of topological physics is to understand the role of interaction and to realize interacting topological phases in realistic materials. In this talk\, we will discuss the possible realization of interacting topolo gical states in bilayer graphene under a strong magnetic field. We start f rom a fermonic two-channel quantum spin Hall state with two copies of heli cal edge states\, which have been demonstrated experimentally in bilayer g raphene. By introducing interaction into two channel helical liquids\, we demonstrate that all the fermion degrees are gapped out and only one boson ic mode remains\, thus yielding a bosonic version of topological insulator \, dubbed &ldquo\;bosonic symmetry protected topological state&rdquo\;. Ph ysically\, the two dual boson fields of this bosonic mode carry charge-2e and spin-1\, respectively\, due to the helical nature. Thus\, we dubbed th em &ldquo\;bosonic helical liquids&rdquo\;. We further study the transport of a quantum point contact for bosonic helical liquids and compare them t o fermonic two-channel helical liquids. A novel charge insulator/spin cond uctor phase is identified in the weak repulsive interaction regime for bos onic helical liquids while charge insulator/spin insulator or charge condu ctor/spin conductor phase is present for fermonic two-channel helical liqu ids. Thus\, a quantum point contact experiment will allow us to identify t he bosonic symmetry protected topological states unambiguously. Similar ph ysics can also emerge in topological mirror Kondo insulators\, such as SmB 6.
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\n\nReference:
\n\n[1] Bilayer Graphene a s a platform for Bosonic Symmetry Protected Topological States\, \;Zhen Bi\, \;Ruixing Zhang\, \;Yi-Zhuang You\, \;Andrea Young\, \;Leon Balents\, \;Chao-Xing Liu\, \;Cenke Xu\, arXiv:1602.03190v1\, 2016
\n\n[2] Interacting topological phases in thin films of topological mir ror Kondo insulators\, \;Rui-Xing Zhang\, \;Cenke Xu\, \;Chao -Xing Liu\, arXiv: 1607.06073\, 2016
\n\n[3] Fingerprints of bos onic symmetry protected topological state in a quantum point contact\, Rui -xing Zhang\, Chao-xing Liu\, arxiv: 1610.01236\, 2016
\n DTSTART:20161110T160000Z LOCATION:Physics Building\, Room 313 SUMMARY:Interacting helical liquids in bilayer graphene END:VEVENT END:VCALENDAR