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DESCRIPTION:Strongly correlated and topological phases in condensed matter 
 systems are at the cutting edge of fundamental physics studies\, as well a
 s being promising candidates for the next generation of technological capa
 bilities like quantum computing. In recent years\, a remarkable amount of 
 progress has been made in creating and controlling such phases by introduc
 ing a small twist angle or lattice mismatch between two dimensional (2D) m
 aterials. These systems\, called moiré systems\, have facilitated the sur
 prising discovery of strongly correlated phases where one might not expect
  them (e.g. superconductivity in “magic-angle” twisted bilayer graphen
 e) or long-sought new physics (e.g. the fractional quantum anomalous Hall 
 effect (FQAHE) in twisted MoTe2). However\, much of the work in this rapid
 ly developing field have focused on the case where the constituent 2D mate
 rials of the moiré system are monolayers\, or at most bilayers. I will sh
 ow that this restriction to one or two atomic layers is unnecessarily limi
 ting. Surprising new phenomenology can be realized in graphitic moiré sys
 tems\, where at least one component is three-layers or more. Most notably\
 , we find that a new type of “moiré enabled” electron crystallization
  can occur that spontaneously breaks the moiré translational symmetry and
  has dissipationless edge modes\, analogous to a topological version of a 
 Wigner crystal. Our results suggest that these topological electron crysta
 ls 1) are at least somewhat common across multilayer graphene moiré syste
 ms\, 2) can have uniquely tunable magnetization states\, and 3) closely co
 mpete with the newly discovered FQAHE. Understanding this competition\, as
  well as the novel phenomenology of the topological electron crystal phase
 \, will be of fundamental interest in future studies of strongly correlate
 d topological systems.\n\nSpeaker(s): Dacen\, Dacen\n\nRoom: A204\, Bldg: 
 Osborne Center\, 1420 Austin Bluffs Pkwy\, Osborne Center\, Colorado Sprin
 gs\, Colorado\, United States\, 80918
LOCATION:Room: A204\, Bldg: Osborne Center\, 1420 Austin Bluffs Pkwy\, Osbo
 rne Center\, Colorado Springs\, Colorado\, United States\, 80918
ORGANIZER:jbrock8@uccs.edu
SEQUENCE:13
SUMMARY:Prof. Dacen Waters: Engineering topological quantum magnets in twis
 ted graphene multilayers
URL;VALUE=URI:https://events.vtools.ieee.org/m/544101
X-ALT-DESC:Description: <br /><p class="MsoNormal" style="text-align: justi
 fy\;">Strongly correlated and topological phases in condensed matter syste
 ms are at the cutting edge of fundamental physics studies\, as well as bei
 ng promising candidates for the next generation of technological capabilit
 ies like quantum computing. In recent years\, a remarkable amount of progr
 ess has been made in creating and controlling such phases by introducing a
  small twist angle or lattice mismatch between two dimensional (2D) materi
 als. These systems\, called moir&eacute\; systems\, have facilitated the s
 urprising discovery of strongly correlated phases where one might not expe
 ct them (e.g. superconductivity in &ldquo\;magic-angle&rdquo\; twisted bil
 ayer graphene) or long-sought new physics (e.g. the fractional quantum ano
 malous Hall effect (FQAHE) in twisted MoTe<sub>2</sub>). However\, much of
  the work in this rapidly developing field have focused on the case where 
 the constituent 2D materials of the moir&eacute\; system are monolayers\, 
 or at most bilayers. I will show that this restriction to one or two atomi
 c layers is unnecessarily limiting. Surprising new phenomenology can be re
 alized in graphitic moir&eacute\; systems\, where at least one component i
 s three-layers or more. Most notably\, we find that a new type of &ldquo\;
 moir&eacute\; enabled&rdquo\; electron crystallization can occur that spon
 taneously breaks the moir&eacute\; translational symmetry and has dissipat
 ionless edge modes\, analogous to a topological version of a Wigner crysta
 l. Our results suggest that these topological electron crystals 1) are at 
 least somewhat common across multilayer graphene moir&eacute\; systems\, 2
 ) can have uniquely tunable magnetization states\, and 3) closely compete 
 with the newly discovered FQAHE. Understanding this competition\, as well 
 as the novel phenomenology of the topological electron crystal phase\, wil
 l be of fundamental interest in future studies of strongly correlated topo
 logical systems.</p>
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