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DTSTAMP:20260424T143110Z
UID:1662973200@ist.ac.at
DTSTART:20220912T110000
DTEND:20220912T120000
DESCRIPTION:Speaker: Yulia Maximenko\nhosted by Hryhoriy Polshyn\nAbstract:
  Mapping tunable bands in twisted double bilayer graphene in magnetic fie
 ldsFlat and narrow band physics in moiré materials has proven to be extre
 mely rich with many-body quantum phenomena. Twisted 2D heterostructures ho
 st an abundance of quantum phases\, such as non-trivial superconductivity\
 , correlated insulator\, anomalous quantum Hall effect\, or charge density
  waves\, which often compete with each other and are extremely sensitive t
 o tunable parameters. Local probe measurements are key for disentangling t
 he complicated parameter space while probing a well-characterized atomical
 ly pristine domain. Here\, we chose to study small-angle twisted double bi
 layer graphene (TDBG): Its electrostatic tunability gives us extra control
  compared to magic-angle systems\, while its narrow but not completely fla
 t bands give us a practical experimental way to systematically study its l
 ow energy physics. We employ scanning tunneling spectroscopy in magnetic f
 ields up to 15 T and analyze the system’s magnetic field response to ful
 ly map the low-energy bands in varying electric fields. We demonstrate exp
 erimentally and theoretically the importance of band geometry and evaluate
  the Berry phase\, quantum metric\, and magnetic susceptibility contributi
 ons.Authors: Y. Maximenko1\,2\, M. R. Slot1\,3\, S. Kim1\,2\, D. T. Walku
 p1\, E. Strelcov1\, E. M. Shih1\,3\, D. Yildiz1\,2\, S. R. Blankenship1\, 
 K. Watanabe5\, T. Taniguchi5\, Y. Barlas6\, P. Haney1\, N. B. Zhitenev1\, 
 F. Ghahari7\, and J. A. Stroscio1 1National Institute of Standards and Te
 chnology\, MD2University of Maryland\, MD 3Georgetown University\, DC 5N
 ational Institute for Materials Science\, Japan 6University of Nevada\, R
 eno\, NV 7George Mason University\, VA 
LOCATION:Heinzel Seminar Room/ Office Building West\, ISTA
ORGANIZER:
SUMMARY:Yulia Maximenko: Mapping tunable bands in twisted double bilayer gr
 aphene in magnetic fields
URL:https://talks-calendar.ista.ac.at/events/3923
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