Recent content by wasong

This paper says that screening length in graphene is 4 anstroms. I think that electric field is decreased at 4 anstroms. I don't understand your answer.

https://www.science.org/doi/10.1126/science.1130681 Thanks.

In the paper "Controlling the Electronic Structure of Bilayer Graphene", they did 5x10^(18) cm^-3 of nitrogen doping on a 6H-SiC substrate. They assumed a very thick graphite layer and a junction, and calculated the potential difference between the first and second layers of graphene near the...

I'm not trying to use nickel for Ohm contact. Nickel silicide is used for ohmic contact differently from nickel, so we just want to know what difference NiSi becomes ohmic contact differently from Ni.

How NiSi is ohmic contact? Ohm contact occurs when a semiconductor has a lower work function than a metal, doesn't it? NiSi has a larger work function than Ni, so how do you make ohm contact?

Can you tell the difference between two neutrons in an alpha particle? In one alpha particle, we know that the sum of the spins of two neutrons is zero. Can a neutron with upspin and a neutron with downspin be distinguished from each other? Or can't you tell because it's superimposed?

If the answer to my question is yes, where can I find the relevant concept or data?

Does the word "less likely" mean that there is a possibility of it happening? from a single pair of photons

Sorry.. The book is Concepts of Modern Physics. I was not good at English and citation.

in a book: Electromagnetic waves (with enough energy) = γ→ e− + e+ in my opinion: Electromagnetic waves (with enough energy) = γ→ e− + e+ that's right! or Electromagnetic waves (with enough energy) = γ→ e− + e− + e+ + e+ also that's right! because There's no problem if you keep Conservation...

Why?? There's no problem if you keep Conservation of energy and conservation of charge, right?

I don't understand. What's mean "Whence"?

Thank you~ (electron+electron+positron+positron)!

Can light make two pairs? (assuming enough energy to make two pairs) If so, why? or If not, why not?