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@ARTICLE{KrishnaKumar:1053952,
      author       = {Krishna Kumar, Roshan and Li, Geng and Bertini, Riccardo
                      and Chaudhary, Swati and Nowakowski, Krystian and Park,
                      Jeong Min and Castilla, Sebastian and Zhan, Zhen and
                      Pantaleón, Pierre A. and Agarwal, Hitesh and Batlle-Porro,
                      Sergi and Icking, Eike and Ceccanti, Matteo and
                      Reserbat-Plantey, Antoine and Piccinini, Giulia and Barrier,
                      Julien and Khestanova, Ekaterina and Taniguchi, Takashi and
                      Watanabe, Kenji and Stampfer, Christoph and Refael, Gil and
                      Guinea, Francisco and Jarillo-Herrero, Pablo and Song,
                      Justin C. W. and Stepanov, Petr and Lewandowski, Cyprian and
                      Koppens, Frank H. L.},
      title        = {{T}erahertz photocurrent probe of quantum geometry and
                      interactions in magic-angle twisted bilayer graphene},
      journal      = {Nature materials},
      volume       = {24},
      number       = {7},
      issn         = {1476-1122},
      address      = {Basingstoke},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2026-01629},
      pages        = {1034 - 1041},
      year         = {2025},
      abstract     = {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.},
      cin          = {PGI-9},
      ddc          = {610},
      cid          = {I:(DE-Juel1)PGI-9-20110106},
      pnm          = {5222 - Exploratory Qubits (POF4-522) / GrapheneCore3 -
                      Graphene Flagship Core Project 3 (881603) / 2D4QT - 2D
                      Materials for Quantum Technology (820254) / EXC 2004: 
                      Matter and Light for Quantum Computing (ML4Q) (390534769) /
                      DFG project G:(GEPRIS)471733165 - Moiré-verstärkte
                      Infrarot-Photodetektion und THz-Emission in verdrehten
                      Graphen-Übergittern (471733165)},
      pid          = {G:(DE-HGF)POF4-5222 / G:(EU-Grant)881603 /
                      G:(EU-Grant)820254 / G:(BMBF)390534769 /
                      G:(GEPRIS)471733165},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {40128628},
      UT           = {WOS:001450729300001},
      doi          = {10.1038/s41563-025-02180-3},
      url          = {https://juser.fz-juelich.de/record/1053952},
}