Stanislav Dolgopolov

4 Questions 51 Answers 0 Followers

Questions related from Stanislav Dolgopolov

Why are persistent currents in superconductors stable regardless of temperature increase?

From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. So if we induce a persistent supercurrent in a ring below Tc and...

27 May 2025 7,002 9 View

Can electron pairing in superconductors be derived from the presence of real-space-states of electrons?

Every crystal contains a set of spatial ground states, which may be occupied by electrons with opposite spins, forming singlet pairs. Every pair breaking event means that one of electrons leaves...

17 January 2024 9,284 10 View

Will a persistent supercurrent in a superconducting (SC) ring decay, if we connect the SC ring to a wire and the remote end of the wire is not SC?

The seemingly simple question, but nobody can answer it unambiguously. Experimental setup to the question is shown in Figure 1 in Tuning of Lifetime of Cooper pairs in a Massive Aluminum Ring A...

15 September 2023 8,716 5 View

Is the second quantization notation applicable for crystals, where identical valence electrons occupy both local and nonlocal states ?

The second quantization notation operates with occupation numbers. For electrons within a quantum system the occupation number of each state is 1 or 0. However, local states in crystals do not...

10 March 2020 5,276 14 View