The Joint Condensed Matter Seminar (JCMS) series is organised by KTH Royal Insitute of Technology, Nordita, and Stockholm University.
On Monday, October 30th, 2023 from 11 am to 12 am we will host a seminar by Boris Svistunov from UMass Amherst. Note the unsual place: the seminar will take place in Albano Building 3, Giga room 3:6231.
Transverse Quantum Fluids: New Paradigm of Quasi-one-dimensional Superfluidity
For decades, it was believed that superfluid or superconducting properties of quasi-one-dimensional systems can be universally understood with a relatively simple quantum model known as Luttinger liquid. The discovery of the supertransoprt-through-solid effect in imperfect crystals of heliun-4, always accompanied by even more striking effect of isochoric (i.e., fixed-volume) compressibility, has dramatically changed the situation. Based on first-principles simulations, there is little doubt that the unique behavior of imperfect helium-4 crystal is dictated by quasi-one-dimensional objects—edge dislocations with superfluid cores. Nevertheless, the unusual temperature dependence of the supertransport effect does not fit into the Luttinger liquid paradigm. I will explain that here, and in a few other instructive setups, we are dealing with a fundamentally new type of quasi-one-dimensional superfluids, the so-called transverse quantum fluids. From a fundamental point of view, transverse quantum fluids provide us with an exciting demonstration of conditional character of many dogmas associated with superfluidity.