Results 131 to 140 of about 135,446 (298)

Ultrafast artificial intelligence: machine learning with atomic-scale quantum systems

New Journal of Physics
We train a model atom to recognize pixel-drawn digits based on hand-written numbers in the range 0–9, employing intense light–matter interaction as a computational resource.
Thomas Pfeifer, Matthias Wollenhaupt, Manfred Lein   +2 more
doaj   +1 more source

Giant Nonequilibrium Valley Control via Spin‐Selective Hot‐Carrier Transfer in an Antiferromagnetic van der Waals Stack

Advanced Materials, EarlyView.
Spin‐selective hot‐carrier transfer across CrSBr/WSe2/CrSBr interfaces couples the continuously tunable magnetic configuration of antiferromagnetic CrSBr to the valley degrees of freedom of monolayer WSe2, enabling giant nonequilibrium valley control and magnetic‐state‐dependent reversal of circularly polarized emission.
Ke Xiao, Jiabao Yang, Kai Feng, Yicheng Guan, James Caleb Peters, Ramona Hoffmann, Niels Schröter, Stuart S. P. Parkin   +7 more
wiley   +1 more source

Advantages of Ultrafast™ ultrasound in the screening for renal artery disease

Journal of Ultrasonography
Renal artery disease is the most common cause of secondary hypertension worldwide. B-mode and Doppler ultrasound are considered the modalities of choice for the imaging of the renal arteries.
Ivanac Gordana, Bulum Antonio, Jagnjić Ana Bojko, Vujević Filip, Lucijanić Marko, Bulum Marta, Ivanac Krešimir, Brkljačić Boris, Divjak Eugen   +8 more
doaj   +1 more source

Vibrational Coherence Reveals the Role of Dark Multiexciton States in Ultrafast Singlet Exciton Fission

, 2014
We use 2D electronic photon-echo spectroscopy to study ultrafast singlet exciton fission in pentacene. Our observations and analysis of vibronic coherences provide insight to the role played by dark multiexcitonic states in mediating ...
Bakulin, Artem A., Zigmantas, Donatas,, Dassia Egorova, Alster, Jan, Jan Alster, Rao, Akshay, Alster, Jan,, Egorova, Dassia, Alex Chin, Zigmantas, Donatas, Donatas Zigmantas, Sarah E. Morgan, Artem A. Bakulin, Chin, Alex, Akshay Rao, Morgan, Sarah E., Lund University.   +16 more
core   +1 more source

Parity‐Dependent THz Harmonic Generation in Electrically Pumped Micro‐Lasers Exploiting Topological Insulator–Metamaterial Gratings

Advanced Materials, EarlyView.
Topological insulator–metamaterials integrated with electrically driven terahertz quantum cascade lasers enable parity‐dependent harmonic generation. Bulk‐dominated Bi2Se3 favors third‐harmonic emission at 9.96 THz, whereas topological‐surface‐state‐dominated Bi2Se3, Bi2Te3, and (Bi,Sb)2Te3 generate strong second harmonics near 6.5 THz.
Alessandra Di Gaspare, Craig S. Knox, Ahmet Yagmur, Sara Ghayeb Zamharir, Lianhe Li, Satoshi Sasaki, A. Giles Davies, Edmund H. Linfield, Joshua R. Freeman, Miriam S. Vitiello   +9 more
wiley   +1 more source

Spatial and temporal thermal management of a spintronic terahertz emitter

Applied Physics Express
This work presents methods for addressing undesirable thermal effects induced by the pump beam of an oscillator laser to improve the efficiency of a terahertz (THz) spintronic emitter.
Gabriel Gandubert, Joel Edouard Nkeck, Xavier Ropagnol, Denis Morris, François Blanchard   +4 more
doaj   +1 more source

Interface‐Mediated Catalysis for Improved Hydrogen Storage in Reactive Hydride Composites

Advanced Materials, EarlyView.
Catalyst–hydride interfaces are engineered in Co@C‐ and Ni@C‐modified 2LiH + MgB2 reactive hydride composites to accelerate hydrogen uptake and release. Multiscale scattering, in‐situ synchrotron radiation powder x‐ray diffraction and density functional theory calculations reveal the structural and electronic origin of the catalytic enhancement ...
Yuanyuan Shang, Pawan Kumar Soni, Han Ge, Weijie Yang, Fahim Karimi, Thi Thu Le, Tamás Simon, Michael Fröba, Jitendra Mata, Joshua King, Hai‐Wen Li, Thomas Klassen, Claudio Pistidda   +12 more
wiley   +1 more source

Giant Anisotropic Spin Absorption in Chiral Hybrid Semiconductors

Advanced Materials, EarlyView.
Researchers uncover that chiral hybrid organic–inorganic semiconductors absorb spin differently depending on its polarization direction. This anisotropic spin absorption is primarily driven by the local symmetry breaking within the layered structure.
Cong Yang, Rui Sun, Mingwei Ge, Shehzad Khan, Subhrangsu Mukherjee, Matthew P. Hautzinger, Tianyou Lu, Harald Ade, Pius M. Theiler, Matthew C. Beard, Dali Sun, Mengxia Liu, Jun Liu   +12 more
wiley   +1 more source

Highly Sensitive Broadband Photodetectors Based on Donor–Acceptor 2D Conjugated Coordination Polymers

Advanced Materials, EarlyView.
Donor–acceptor molecular design and chemical vapor deposition growth enable the two‐dimensional nickel‐tetraaminobenzoquinone films with strong broadband absorption and efficient charge separation. The resulting photodetectors exhibit a structured broadband response with a high responsivity of ∼3.1 A W−1 and a response time of ∼170 µs, which surpasses ...
Yunxu Chen, Jinxin Liu, Shuai Fu, Apurba Mahapatra, Dongxu Wang, Mike Hambsch, Angelika Wrzesińska‐Lashkova, Jing Wang, Fabian Paulus, Yana Vaynzof, Stefan C. B. Mannsfeld, Fuchun Zhang, Mischa Bonn, Renhao Dong, Xinliang Feng   +14 more
wiley   +1 more source

Smart Electrospun Nanofibers for Controlled Oil‐Water Separation

Advanced Materials Interfaces, EarlyView.
Stimuli‐responsive electrospun nanofibers are reviewed as advanced platforms for controlled oil/water separation. The effects of surface wettability, porous structure, and external stimuli, including pH, temperature, gas, and light, on separation performance are discussed.
Aynaz Sedaghatnia, Milad Babazadeh‐Mamaqani, Hossein Roghani‐Mamaqani, Donya Razzaghi, Amin Babaie, Reza Lotfi‐Mayan, Mostafa Rezaei   +6 more
wiley   +1 more source