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Quantum oscillations probe the Fermi surface topology of the nodal-line semimetal CaAgAs

- Y. H. Kwan, P. Reiss, +6 authors A. Coldea
- Physics
- 8 January 2020

Nodal semimetals are a unique platform to explore topological signatures of the unusual band structure that can manifest by accumulating a nontrivial phase in quantum oscillations. Here we report a… Expand

Domain wall competition in the Chern insulating regime of twisted bilayer graphene

- Y. H. Kwan, Glenn Wagner, N. Chakraborty, S. Simon, S. Parameswaran
- Physics, Materials SciencePhysical Review B
- 15 July 2020

We consider magic-angle twisted bilayer graphene (TBG) at filling $\nu=+3$, where experiments have observed a robust quantized anomalous Hall effect. This has been attributed to the formation of a… Expand

Twisted bilayer graphene in a parallel magnetic field

- Y. H. Kwan, S. Parameswaran, S. Sondhi
- Physics
- 9 October 2019

We study the effect of an in-plane magnetic field on the noninteracting dispersion of twisted bilayer graphene. Our analysis is rooted in the chirally symmetric continuum model, whose zero-field band… Expand

Kekulé Spiral Order at All Nonzero Integer Fillings in Twisted Bilayer Graphene

- Y. H. Kwan, Glenn Wagner, +4 authors N. Bultinck
- PhysicsPhysical Review X
- 12 May 2021

Y.H. Kwan, G. Wagner, T. Soejima, M.P. Zaletel, 3 S.H. Simon, S.A. Parameswaran, and N. Bultinck 4 Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3PU, United Kingdom… Expand

Theory of competing excitonic orders in insulating
WTe2
monolayers

- Y. H. Kwan, T. Devakul, S. Sondhi, S. Parameswaran
- PhysicsPhysical Review B
- 9 December 2020

We develop a theory of the excitonic phase recently proposed as the zero-field insulating state observed near charge neutrality in monolayer WTe$_2$. Using a Hartree-Fock approximation, we… Expand

Excitonic fractional quantum Hall hierarchy in Moiré heterostructures

- Y. H. Kwan, Yichen Hu, S. Simon, S. Parameswaran
- Physics
- 25 March 2020

We consider fractional quantum Hall states in systems where two flat Chern number $C=\pm 1$ bands are labeled by an approximately conserved 'valley' index and interchanged by time reversal symmetry.… Expand

Exciton Band Topology in Spontaneous Quantum Anomalous Hall Insulators: Applications to Twisted Bilayer Graphene.

- Y. H. Kwan, Yichen Hu, S. Simon, S. Parameswaran
- Medicine, PhysicsPhysical review letters
- 25 March 2020

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Quantum oscillations in the zeroth Landau Level and the serpentine Landau fan

- T. Devakul, Y. H. Kwan, S. Sondhi, S. Parameswaran
- Physics
- 13 January 2021

We identify an unusual mechanism for quantum oscillations in nodal semimetals, driven by a single pair of Landau levels periodically closing their gap at the Fermi energy as a magnetic field is… Expand

Global phase diagram of twisted bilayer graphene above $T_c$

- Glenn Wagner, Y. H. Kwan, N. Bultinck, S. Simon, S. Parameswaran
- Physics
- 20 September 2021

We investigate the full doping and strain-dependent phase diagram (absent superconductivity) of magic-angle twisted bilayer graphene (TBG). Using comprehensive Hartree-Fock calculations, we show that… Expand

Quantum Oscillations in the Zeroth Landau Level: Serpentine Landau Fan and the Chiral Anomaly.

- T. Devakul, Y. H. Kwan, S. Sondhi, S. Parameswaran
- MedicinePhysical review letters
- 10 September 2021

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