Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session R05: Ultrafast Dynamics in Solid-State Systems
2:00 PM–4:00 PM,
Thursday, June 6, 2024
Room: 202AB
Chair: Vladimir Malinovsky, DEVCOM Army Research Lab Adelphi
Abstract: R05.00004 : Lightwave controlled band engineering of quantum materials
2:54 PM–3:24 PM
Presenter:
Matthias F Kling
(Stanford University)
Authors:
Matthias F Kling
(Stanford University)
Sambit Mitra
(LMU Munich)
Álvaro Jiménez Galán
(MBI Berlin)
Mario Aulich
(SLAC National Accelerator Laboratory)
Marcel Neuhaus
(SLAC National Accelerator Laboratory)
Shubhadeep Biswas
(SLAC National Accelerator Laboratory)
We have implemented a tailored lightwave-driven analogue to twisted layer stacking in a hexagonal boron nitride monolayer [3, 4]. We tailored the symmetry of the light waveform to that of the crystal lattice (C3), which allowed for sub-femtosecond control over time-reversal symmetry breaking and thereby band structure engineering. In this way, for the first time, we have realized the light-analogue of the topological Haldane model [5] in an insulating material, controlling its parameters with sub-femtosecond precision. Twisting the lightwave relative to the lattice orientation enables switching between band configurations, providing unprecedented control over the magnitude and location of the band gap, and curvature. This also allows us to establish a new regime of valleytronics [6] that uses non-resonant light fields and allows valley polarization control on femtosecond timescales.
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