Contents - Max-Planck-Institut für Physik komplexer Systeme
Contents - Max-Planck-Institut für Physik komplexer Systeme
Contents - Max-Planck-Institut für Physik komplexer Systeme
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inferencecanbeused.ThesetopicswereaddressedinthecontributionsofP.A.ValdesSosa,I.Bojakand<br />
R.D.PascualMarqui.Aspartoftheworkshopapubliceveninglecture“Whydowesleep?”wasgiven<br />
byP.Achermann. Thelecturewasattendedbyapproximately200visitorsandwasfollowedbyalively<br />
discussion. K.Friston,oneoftheleadingtheoristsoncorticalfunction,furthermoregaveacolloquium<br />
talkentitled“Free-energy,perceptionandlearning”tothemembersofthe<strong>Max</strong><strong>Planck</strong><strong>Institut</strong>efor<br />
thePhysicsofComplexSystems. Aspecialdiscussionsessionduringtheworkshopaddressedproblems<br />
regardingcommunicationandepistemologicalbarriersbetweenthedifferentdisciplines. Theworkshop<br />
wasasignificantsteptobridgesuchgapsandtoinitiateinteractionsbetweenthedifferentcontributing<br />
disciplines.Youngresearchers(PhDstudentsandpostdoctoralfellows)presentedtheirworkinaposter<br />
session(19posters)orasspeakerinthemainprogram(S.Postnova).Posterswereatdisplayduringthe<br />
entireworkshop.Aseminarcomplementedtheworkshop.Thisaimedatsupportingimmediateresearch<br />
workbytheparticipantsaswellassettingupofnewcollaborations. Theseminarlastedfor10days<br />
andwasattendedby13participants,mainlyyoungresearchers. Itincludedfivetutoriallecturesthat<br />
providedintroductionsintocomplexitymeasures,statespacemodels,sleep,neuralassembliesandlarge<br />
scalesimulationmodels. Threeadditionalmorningsessionstargetedonopendiscussionswithfocion<br />
challengesintimeseriesanalysis,acalculusofcognition,andthefutureoflarge-scalemodeling.Beside<br />
thesearrangedtalksanddiscussions,participantsworkedoncollaborativeprojectsofwhichsomewill<br />
continueinthefuture.<br />
TopologicalOrder:FromQuantumHallSystemstoMagneticMaterials,Workshop<br />
(JointlywithAPCTP)<br />
Scientificcoordinators:R.Moessner,S.Trebst<br />
TheinternationalseminarandworkshopTopologicalOrder: FromquantumHallsystemstomagnetic<br />
materialswasdevotedtoabroadvarietyofphysicalsystemsthatexhibitunconventionallyorderedphases<br />
includingfrustratedmagnets,quantumHallsystems,time-reversalsymmetrybreakingsuperconductors,<br />
ultracoldatomsystems,andtopologicalinsulators.Itbroughttogethertheoristsworkingonfundamental<br />
conceptsoftopologicalorder, quantumphasetransitionsinconstrainedsystems, spinliquidphases,<br />
andquantuminformationtheoryaswellasexperimentalistsworkingontwo-dimensionalelectrongases,<br />
quantumwells,andtransitionalmetalcompoundsincludingIridiumoxides,spinels,andchiralmagnets.<br />
Thethree-weekseminarprogramwasstructuredaroundoneortwodailytalks,includingtwolectures<br />
devotedtopedagogicalintroductionsineachweek.Thethreeweekswerenotorganizedtohavespecial<br />
focustopics,sinceoneofthecentralobjectivesoftheworkshopwastobringtogetherscientistsfrom<br />
twoseeminglydisjointcommunities,butwithoverlappinginterests ontheonehandscientistsworking<br />
onfrustratedmagnetismmotivatedprimarilyfromamaterials-scienceperspectiveandontheotherhand<br />
scientistswithafocusontopologicalphasesandtheirharnessingfortopologicalquantumcomputing<br />
withaparticularemphasisonfractionalquantumHallbasedsystems. Judgingfromthelivelyactivity,<br />
vigorousdiscussionsandoverwhelminglypositivefeedbackthroughouttheprogramwebelievethatthis<br />
concepthasworkedverywell.<br />
Nevertheless,somethemesshapedthediscussionsoftheindividualseminarweeksmorethanothers,<br />
mostlyduetothevaryingrosterofparticipantsineachweek.Thefirstweekgreatlybenefitedfroman<br />
introductorylectureofAlexeiKitaev(Caltech),oneofthepioneersinthefieldoftopologicalorderand<br />
topologicalquantumcomputation.Hereviewedfundamentalaspectsoftopologicalorderinmicroscopic<br />
modelsandthenproceededtoanadvancedmathematicaldescriptionoftheinterplayoftopological<br />
orderandquantumcriticalbehavior.Impressiveprogressinthetheoreticaldescriptionofquantumphase<br />
transitionsinhighlyconstrainedsystemswasalsoreportedbyvariousspeakersthroughouttheprogram<br />
includingJohnChalker(Oxford), KaiSchmidt(Dortmund), ClaudioCastelnovo(Oxford), andEun-<br />
AhKim(Cornell). Othertopicsoftheseminarweeksincludedtheexoticphysicsofhighlyfrustrated<br />
magnetsputforwardintalksbyRibhuKaul(SantaBarbara),ChrisHenley(Cornell),WolframBrenig<br />
(Braunschweig),andOlegTchernyshyov(JohnsHopkins)aswellasconceptualapproachestoexotic<br />
spinliquidbehaviordiscussedbyT.Senthil(MIT).Quantuminformationapproachestotopologicalorder<br />
werehighlightedinvarioustalksincludingthosebyFrankVerstraete(Vienna)andVincentPasquier<br />
(CEA/IPhT).<br />
Arecurringthemeoftheseminarweekswastheconjecturednon-Abelianstatisticsofanionicexcitations<br />
incertainfractionalquantumHallstates,especiallythev=5/2state.Severaldiscussionsevolvedaround<br />
possibleexperimentalschemestoprobesuchapeculiarstateofmatterincludingquantuminterferometers<br />
122 DetailsandData
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