Quantum 2025 – wissenschaftliches Programm
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FRI: Friday Contributed Sessions
FRI 11: Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems: Contributed Session to Symposium
FRI 11.2: Vortrag
Freitag, 12. September 2025, 11:00–11:15, ZHG104
Giant chiral current in gapped graphene at room temperature — •Fanrong Lin1, Weilong Guo2, Qingjun Tong2, and Yanpeng Liu3 — 1Georg-August-University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Hunan University — 3Nanjing university of aeronautics and astronautics
Nonlinear electrical signals serve as a complementary probe for investigating intrinsic quantum geometric properties while also revealing unconventional charge transport phenomena in systems with specific band topologies. A paradigmatic example is the chiral charge transport observed in gapped monolayer graphene, where the chiral Bloch electrons undergo unidirectional skew scattering. However, these nonlinear signals are typically exceedingly weak, necessitating either intrinsic topological band structures or extrinsic circuit enhancements to achieve detectable magnitudes. Here, we introduce a linear projection method that amplifies nonlinear physical, yielding a dramatically enhanced signal even at room temperature. Using this approach, we observe a robust unidirectional skew-scattered current, exhibiting a signal of several microvolt at room temperature. Furthermore, this chiral current exhibits dual tunability via external gate and DC bias voltages, enabling control over both the majority carrier type and the skew conductivity. Finally, we demonstrate nonlocal transport mediated by this tunable chiral current, generating a substantial nonlocal signal in remotely gated Hall bar pairs with a geometric factor of 4. This unconventional charge transport mechanism opens a pathway for long-range control in next-generation electronic devices.
Keywords: Skew Scattering; Chiral Bloch electron; nonlinear; anomalous Hall effect