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SUMMARY:Twisting quantum matter beyond the graphene paradigm
DTSTART:20221108T160000Z
DTEND:20221108T170000Z
DTSTAMP:20260628T060143Z
UID:4ef774fe-aab9-4a72-a10b-e7aeb7441d8b
SEQUENCE:2
CREATED:20221107T144608Z
DESCRIPTION:The ability to control and manipulate the strength of correlat
 ions inquantum matter is one of the central questions in condensed matterp
 hysics today. While pressure\, chemical doping\, or magnetic field haveser
 ved as conventional tuning knobs for a wide class of correlatedsystems\, t
 he ability to twist van der Waals materials has recentlyemerged as a novel
  scheme to engineer strong correlations and tuneelectronic properties. For
  example\, when two sheets of graphene aretwisted to a &quot\;magic angle\
 ,&quot\; the kinetic energy of the electronic degreesof freedom vanishes a
 nd\, as a result\, interaction effects dominate. Thishas now been demonstr
 ated experimentally following the discovery ofsuperconductivity in close p
 roximity to correlated insulating phases inmagic-angle graphene.In this ta
 lk\, I will first discuss our theory that describes themagic-angle phenome
 na as a universal property of Dirac points in anincommensurate potential. 
 This allows us to generalize the magic-angleeffect to a wide class of mode
 ls and distinct physical settings\, such asultra-cold atomic gases\, trapp
 ed ions\, and metamaterials. This generalperspective will then be used to 
 demonstrate how unconventionalsuperconductors can be manipulated via a twi
 st. These results will thenbe applied to describe recent experiments on tw
 isted slabs of thehigh-temperature superconductor
LAST-MODIFIED:20221108T092506Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/twisting-quantum-matter-be
 yond-the-graphene-paradigm/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="2agml">The ability to cont
 rol and manipulate the strength of correlations in<br/>quantum matter is o
 ne of the central questions in condensed matter<br/>physics today. While p
 ressure\, chemical doping\, or magnetic field have<br/>served as conventio
 nal tuning knobs for a wide class of correlated<br/>systems\, the ability 
 to twist van der Waals materials has recently<br/>emerged as a novel schem
 e to engineer strong correlations and tune<br/>electronic properties.<br/>
 <br/> For example\, when two sheets of graphene are<br/>twisted to a &quot
 \;magic angle\,&quot\; the kinetic energy of the electronic degrees<br/>of
  freedom vanishes and\, as a result\, interaction effects dominate. This<b
 r/>has now been demonstrated experimentally following the discovery of<br/
 >superconductivity in close proximity to correlated insulating phases in<b
 r/>magic-angle graphene.<br/></p><p data-block-key="39lj5">In this talk\, 
 I will first discuss our theory that describes the<br/>magic-angle phenome
 na as a universal property of Dirac points in an<br/>incommensurate potent
 ial.<br/><br/> This allows us to generalize the magic-angle<br/>effect to 
 a wide class of models and distinct physical settings\, such as<br/>ultra-
 cold atomic gases\, trapped ions\, and metamaterials. This general<br/>per
 spective will then be used to demonstrate how unconventional<br/>supercond
 uctors can be manipulated via a twist. These results will then<br/>be appl
 ied to describe recent experiments on twisted slabs of the<br/>high-temper
 ature superconductor</p>
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