TY  - JOUR
AU  - Krishna Kumar, Roshan
AU  - Li, Geng
AU  - Bertini, Riccardo
AU  - Chaudhary, Swati
AU  - Nowakowski, Krystian
AU  - Park, Jeong Min
AU  - Castilla, Sebastian
AU  - Zhan, Zhen
AU  - Pantaleón, Pierre A.
AU  - Agarwal, Hitesh
AU  - Batlle-Porro, Sergi
AU  - Icking, Eike
AU  - Ceccanti, Matteo
AU  - Reserbat-Plantey, Antoine
AU  - Piccinini, Giulia
AU  - Barrier, Julien
AU  - Khestanova, Ekaterina
AU  - Taniguchi, Takashi
AU  - Watanabe, Kenji
AU  - Stampfer, Christoph
AU  - Refael, Gil
AU  - Guinea, Francisco
AU  - Jarillo-Herrero, Pablo
AU  - Song, Justin C. W.
AU  - Stepanov, Petr
AU  - Lewandowski, Cyprian
AU  - Koppens, Frank H. L.
TI  - Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
JO  - Nature materials
VL  - 24
IS  - 7
SN  - 1476-1122
CY  - Basingstoke
PB  - Nature Publishing Group
M1  - FZJ-2026-01629
SP  - 1034 - 1041
PY  - 2025
AB  - Moiré materials represent strongly interacting electron systems bridging topological and correlated physics. Despite notable advances, decoding wavefunction properties underlying the quantum geometry remains challenging. Here we utilize polarization-resolved photocurrent measurements to probe magic-angle twisted bilayer graphene, leveraging its sensitivity to the Berry connection that encompasses quantum ‘textures’ of electron wavefunctions. Using terahertz light resonant with optical transitions of its flat bands, we observe bulk photocurrents driven by broken symmetries and reveal the interplay between electron interactions and quantum geometry. We observe inversion-breaking gapped states undetectable through quantum transport, sharp changes in the polarization axes caused by interaction-induced band renormalization and recurring photocurrent patterns at integer filling factors of the moiré unit cell that track the evolution of quantum geometry through the cascade of phase transitions. The large and tunable terahertz response intrinsic to flat-band systems offers direct insights into the quantum geometry of interacting electrons and paves the way for innovative terahertz quantum technologies.
LB  - PUB:(DE-HGF)16
C6  - 40128628
UR  - <Go to ISI:>//WOS:001450729300001
DO  - DOI:10.1038/s41563-025-02180-3
UR  - https://juser.fz-juelich.de/record/1053952
ER  -