PIRSA:12110081

Fractional quantum Hall effect and tunable interactions

Papic, Z. (2012). Fractional quantum Hall effect and tunable interactions. Perimeter Institute. https://pirsa.org/12110081

Papic, Zlatko. Fractional quantum Hall effect and tunable interactions. Perimeter Institute, Nov. 29, 2012, https://pirsa.org/12110081 

          @misc{ pirsa_PIRSA:12110081,
            doi = {10.48660/12110081},
            url = {https://pirsa.org/12110081},
            author = {Papic, Zlatko},
            keywords = {Condensed Matter},
            language = {en},
            title = {Fractional quantum Hall effect and tunable interactions},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {nov},
            note = {PIRSA:12110081 see, \url{https://pirsa.org}}
          }

Zlatko Papic University of Leeds

Talk numberPIRSA:12110081
DOI10.48660/12110081
Collection
Talk Type Scientific Series
Subject

Abstract

In this talk I will review some existing experimental methods, as well as a few recent theoretical proposals, to tune the interactions in a number of low-dimensional systems exhibiting the fractional quantum Hall effect (FQHE). The materials in question include GaAs wide quantum wells and multilayer graphene, where the tunability of the electron-electron interactions can be achieved via modifying the band structure, dielectric environment of the sample, by tilting the magnetic field or varying the mass tensor, and by mixing of electronic subbands and Landau levels. Because the interesting topological (and in particular, non-Abelian) states arise solely due to strong interactions, the ability to tune them is essential for ``designing" more robust FQHE states. Furthermore, I will argue that some of these mechanisms can also be used to probe the subtle aspects of FQHE physics, such as the breaking of particle-hole symmetry between the Moore-Read Pfaffian and anti-Pfaffian states, and the transition between FQHE fluids and broken-symmetry states due to the fluctuation of the intrinsic geometric degree of freedom.