https://www.quantamagazine.org/whats-the-magic-behind-graphenes-magic-angle-20190528/The blockbuster discovery last year of superconductivity in a material called twisted bilayer graphene caught theorists off guard. In all their published ruminations, none of them had even speculated about the phenomenon that showed up in Pablo Jarillo-Herrero’s lab at the Massachusetts Institute of Technology: a sudden loss of electrical resistance when two sheets of graphene — honeycomb lattices of carbon atoms — were stacked and twisted at a relative angle of 1.1 degrees. But theorists are making up for that lapse now, publishing a steady stream of explanations for this “magic angle.”
It’s too soon to say which theory, if any, will do the most to elucidate twisted bilayer graphene’s behavior or enable predictions of other phenomena in twisted stacks of two-dimensional materials — an emerging subject of study known as “twistronics.” But one prominent proposal could jump to the front of the pack. In a paper published in March in Physical Review Letters, the Harvard University condensed matter theorists Grigory Tarnopolsky, Alex Kruchkov and Ashvin Vishwanath offered a detailed picture of what might be going on — as well as suggesting what other angles to probe for potentially exciting results.
The Science of Cables
It seems to me that there is too little scientific, objective evidence for why cables sound the way they do. When I see discussions on cables, physical attributes are discussed; things like shielding, gauge, material, geometry, etc. and rarely are things like resistance, impedance, inductance, capacitance, etc. Why is this? Why aren’t cables discussed in terms of physical measurements very often?
Seems to me like that would increase the customer base. I know several “objectivist” that won’t accept any of your claims unless you have measurements and blind tests. If there were measurements that correlated to what you hear, I think more people would be interested in cables.
I know cables are often system dependent but there are still many generalizations that can be made.
Seems to me like that would increase the customer base. I know several “objectivist” that won’t accept any of your claims unless you have measurements and blind tests. If there were measurements that correlated to what you hear, I think more people would be interested in cables.
I know cables are often system dependent but there are still many generalizations that can be made.
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- 802 posts total
- 802 posts total