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Device description The device is fabricated in a Si-doped GaAs/AlGaAs heterostructure grown by molecular-beam epitaxy. The 2DEG resides 110 nm below the surface, with electron density 2.8 × 1011 cm−2 and mobility 9 × 105 cm2 V−1 s−1. Metallic gates (Ti, 3 nm; Au, 14 nm) are deposited on the surface of the semiconductor using electron-beam lithography. All measurements are performed at a temperature of about Continue Reading
Mindia Wichert has taken part in plenty of brain experiments as a cognitive-neuroscience graduate student at the Humboldt University of Berlin, but none was as challenging as one he faced in 2023. Inside a stark white room, he stared at a flickering screen that flashed a different image every 10 seconds. His task was to Continue Reading
Zhang, Y. M. et al. Distinct signatures for Coulomb blockade and Aharonov-Bohm interference in electronic Fabry-Perot interferometers. Phys. Rev. B 79, 241304 (2009). Article Google Scholar Ofek, N. et al. Role of interactions in an electronic Fabry–Perot interferometer operating in the quantum Hall effect regime. Proc. Natl Acad. Sci. USA 107, 5276–5281 (2010). Article CAS Continue Reading
Conceição, P., Kovacevic, M. & Mukhopadhyay, T. in Measuring Human Capital (ed. Barbara Fraumeni) 83–115 (Academic Press, 2021). Raudsepp-Hearne, C. et al. Untangling the environmentalist’s paradox: why is human well-being increasing as ecosystem services degrade? Bioscience 60, 576–589 (2010). Article Google Scholar Marcantonio, R., Javeline, D., Field, S. & Fuentes, A. Global distribution and coincidence Continue Reading
Medical advances have changed childbirth – potentially enough to impact human evolution FatCamera/Getty Images Women’s pelvises have become narrower over the past 150 years, according to a study of over 8000 people from three countries. There are many factors at play, but whatever the ultimate cause, it is the latest piece of evidence leading researchers Continue Reading
The Trump administration wants to open up tens of millions of acres of national forest to development. The US Department of Agriculture (USDA) announced yesterday that it’s rescinding a landmark rule that prevents road construction and timber harvesting in the last unfragmented stretches of national forest. The USDA says the move will boost timber production, Continue Reading
Bacteria can be engineered to sense a variety of molecules, such as pollutants or soil nutrients, but usually these signals must be detected microscopically. Now Christopher Voigt, head of MIT’s Department of Biological Engineering, and colleagues have triggered bacterial cells to produce signals that can be read from as far as 90 meters away. Their Continue Reading
In the original production technique, layers with different properties can be laid down by alternately exposing a particle to positively and negatively charged polymers, with extensive purification to remove excess polymer after each application. Each layer can carry therapeutics as well as molecules that help the particles find and enter cancer cells. But the process Continue Reading
“If you’re sick, there’s so many more things that are happening to your internal states, your mood, and your behavioral states, and that’s not simply you being fatigued physically. It has something to do with the brain,” she says. In the cortex, the researchers found certain receptors in a population of neurons that, when overactivated, Continue Reading
It was a banner year for the Engineers in 2024–’25, with four MIT women’s teams all clinching NCAA Division III national titles for the first time. After winning their fourth straight NCAA East Regional Championship, the cross country team claimed their first national title in November with All-American performances from Christina Crow ’25 (pictured), Rujuta Continue Reading
