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001053952 1001_ $$0P:(DE-HGF)0$$aKrishna Kumar, Roshan$$b0$$eCorresponding author
001053952 245__ $$aTerahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
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001053952 520__ $$aMoiré 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.
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001053952 536__ $$0G:(EU-Grant)820254$$a2D4QT - 2D Materials for Quantum Technology (820254)$$c820254$$fERC-2018-COG$$x2
001053952 536__ $$0G:(BMBF)390534769$$aEXC 2004:  Matter and Light for Quantum Computing (ML4Q) (390534769)$$c390534769$$x3
001053952 536__ $$0G:(GEPRIS)471733165$$aDFG project G:(GEPRIS)471733165 - Moiré-verstärkte Infrarot-Photodetektion und THz-Emission in verdrehten Graphen-Übergittern (471733165)$$c471733165$$x4
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001053952 7001_ $$0P:(DE-HGF)0$$aLi, Geng$$b1
001053952 7001_ $$0P:(DE-HGF)0$$aBertini, Riccardo$$b2
001053952 7001_ $$0P:(DE-HGF)0$$aChaudhary, Swati$$b3
001053952 7001_ $$0P:(DE-HGF)0$$aNowakowski, Krystian$$b4
001053952 7001_ $$0P:(DE-HGF)0$$aPark, Jeong Min$$b5
001053952 7001_ $$0P:(DE-HGF)0$$aCastilla, Sebastian$$b6
001053952 7001_ $$0P:(DE-HGF)0$$aZhan, Zhen$$b7
001053952 7001_ $$0P:(DE-HGF)0$$aPantaleón, Pierre A.$$b8
001053952 7001_ $$0P:(DE-HGF)0$$aAgarwal, Hitesh$$b9
001053952 7001_ $$0P:(DE-HGF)0$$aBatlle-Porro, Sergi$$b10
001053952 7001_ $$0P:(DE-HGF)0$$aIcking, Eike$$b11
001053952 7001_ $$0P:(DE-HGF)0$$aCeccanti, Matteo$$b12
001053952 7001_ $$0P:(DE-HGF)0$$aReserbat-Plantey, Antoine$$b13
001053952 7001_ $$0P:(DE-HGF)0$$aPiccinini, Giulia$$b14
001053952 7001_ $$0P:(DE-HGF)0$$aBarrier, Julien$$b15
001053952 7001_ $$0P:(DE-HGF)0$$aKhestanova, Ekaterina$$b16
001053952 7001_ $$0P:(DE-HGF)0$$aTaniguchi, Takashi$$b17
001053952 7001_ $$0P:(DE-HGF)0$$aWatanabe, Kenji$$b18
001053952 7001_ $$0P:(DE-Juel1)180322$$aStampfer, Christoph$$b19
001053952 7001_ $$0P:(DE-HGF)0$$aRefael, Gil$$b20
001053952 7001_ $$0P:(DE-HGF)0$$aGuinea, Francisco$$b21
001053952 7001_ $$0P:(DE-HGF)0$$aJarillo-Herrero, Pablo$$b22
001053952 7001_ $$0P:(DE-HGF)0$$aSong, Justin C. W.$$b23
001053952 7001_ $$0P:(DE-HGF)0$$aStepanov, Petr$$b24
001053952 7001_ $$0P:(DE-HGF)0$$aLewandowski, Cyprian$$b25
001053952 7001_ $$0P:(DE-HGF)0$$aKoppens, Frank H. L.$$b26$$eCorresponding author
001053952 773__ $$0PERI:(DE-600)2088679-2$$a10.1038/s41563-025-02180-3$$gVol. 24, no. 7, p. 1034 - 1041$$n7$$p1034 - 1041$$tNature materials$$v24$$x1476-1122$$y2025
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