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| Open AccessPhoto-induced high-temperature ferromagnetism in YTiO3
All-optical, mode-selective manipulation of the crystal lattice can be used to enhance and stabilize ferromagnetism in YTiO3 well above its equilibrium ordering temperature and for many nanoseconds, enabling dynamic engineering of practically useful non-equilibrium functionalities in fluctuating electronic systems.
- A. S. Disa
- , J. Curtis
- & A. Cavalleri
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Article |
Observation of hydrodynamic plasmons and energy waves in graphene
By using new on-chip terahertz spectroscopy techniques to measure the absorption spectra of a graphene microribbon as well as the energy waves close to charge neutrality, hydrodynamic collective excitations are observed.
- Wenyu Zhao
- , Shaoxin Wang
- & Feng Wang
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Article |
Reconstruction of Bloch wavefunctions of holes in a semiconductor
Bloch wavefunctions of two types of hole in gallium arsenide are reconstructed by measuring the polarization of light emitted by collisions of electrons and holes accelerated by a terahertz laser.
- J. B. Costello
- , S. D. O’Hara
- & M. S. Sherwin
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Letter |
Temporal and spectral fingerprints of ultrafast all-coherent spin switching
Antenna-enhanced terahertz pulses ballistically switch spins in antiferromagnetic TmFeO3 with minimal energy dissipation between metastable minima of the anisotropy potential, as characterized by unique temporal and spectral fingerprints.
- S. Schlauderer
- , C. Lange
- & R. Huber
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Letter |
Electric field correlation measurements on the electromagnetic vacuum state
Electro-optic detection in a nonlinear crystal is used to measure coherence properties of vacuum fluctuations of the electromagnetic field and deduce the spectrum of the ground state of electromagnetic radiation.
- Ileana-Cristina Benea-Chelmus
- , Francesca Fabiana Settembrini
- & Jérôme Faist
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Letter |
Subcycle observation of lightwave-driven Dirac currents in a topological surface band
Time- and angle-resolved photoemission spectroscopy reveals how Dirac fermions in the band structure of the topological surface state of Bi2Te3 are accelerated by the carrier wave of a terahertz-frequency light pulse.
- J. Reimann
- , S. Schlauderer
- & R. Huber
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Letter |
Tracking the ultrafast motion of a single molecule by femtosecond orbital imaging
Watching a single molecule move calls for measurements that combine ultrafast temporal resolution with atomic spatial resolution; this is now shown to be possible by combining scanning tunnelling microscopy with lightwave electronics, through a technique that involves removing a single electron from the highest occupied orbital of a single pentacene molecule in a time window shorter than an oscillation cycle of light.
- Tyler L. Cocker
- , Dominik Peller
- & Rupert Huber
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News & Views |
Terahertz collisions
Intense laser fields can rip electrons from an atom and slam them back into it. By using intense terahertz radiation, this idea can be extended to electrons paired with 'holes' in a semiconductor. See Letter p.580
- Rupert Huber
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Letter |
A terahertz metamaterial with unnaturally high refractive index
In the area of metamaterials it is shown that electromagnetic properties can be achieved that are not attainable with natural materials. The main research efforts have been directed towards experimentally realizing materials with negative refractive index, but to extend the potential and design flexibility for novel 'transformation optics' applications, it is of considerable interest to produce a material with unnaturally high refractive index. A broadband, flexible terahertz metamaterial with unprecedented high refractive index, reaching a value of 38.6, is now demonstrated.
- Muhan Choi
- , Seung Hoon Lee
- & Bumki Min