COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Theory of Condensed Matter > 3D quantum Hall effects in Dirac loops

## 3D quantum Hall effects in Dirac loopsAdd to your list(s) Download to your calendar using vCal - Prof. Bruno Uchoa, The University of Oklahoma
- Thursday 24 January 2019, 14:15-15:15
- TCM Seminar Room, Cavendish Laboratory.
If you have a question about this talk, please contact Katarzyna Macieszczak. Nodal line semimetals describe a class of 3D systems where the low energy bands have Dirac quasiparticles along a closed line in momentum space (Dirac loop) rather than a discrete set of Dirac points [1]. Away from half filling, the Fermi surface is a toroid. In the presence of spin orbit coupling effects, this system can behave as a strong topological insulator, with topologically protected surface states. In spite of being three dimensional, this system has Landau level quantization at finite field for certain field geometries. One conceptually interesting family of lattice models that describes this physics is the family of the hyperhoneycomb lattices, which form 3D structures of crossed 1D chains where all sites have the same planar trigonal connectivity of graphene. In this talk, I will show that Coulomb interactions could drive the system to show an anomalous quantum Hall effect (AQHE) [2], with current loops that produce zero net flux in the 3D unit cell. I will show that in the AQH state, because of lack of inversion symmetry, the Haldane mass has nodes along the nodal line, giving rise to pairs of Weyl points connected by Fermi arcs. I will discuss the anomalous Hall conductivity of this system and the connections with strain field deformations encoded in the elastic Hall viscosity [3]. [1] K. Mullen, B. Uchoa, D. Glatzhofer, Phys. Rev. Lett. 115, 026403 (2015). [2] S. W. Kim, K. Seo, B. Uchoa, Phys. Rev. B 97 , 201101® (2018). [3] S. W. Kim, B. Uchoa, arXiv:1901.00574 (2019). This talk is part of the Theory of Condensed Matter series. ## This talk is included in these lists:- All Cavendish Laboratory Seminars
- All Talks (aka the CURE list)
- CSIC Research Talk
- Centre for Health Leadership and Enterprise
- Combined TCM Seminars and TCM blackboard seminar listing
- Featured lists
- Lennard-Jones Centre external
- ME Seminar
- Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
- PMRFPS's
- School of Physical Sciences
- TCM Seminar Room, Cavendish Laboratory
- Theory of Condensed Matter
- Thin Film Magnetic Talks
Note that ex-directory lists are not shown. |
## Other listsComputer Laboratory Computer Architecture Group Meeting Arcadia Lectures Modern Irish History Seminar## Other talksThe work of art in the age of digital reproduction: history, violence, self and Evil on the Internet Max Weber's Political Thought and the First World War Intelligence and the frontal lobes Market design for flexible distribution networks Designing novel functional materials made of active colloids: the role played by interactions |