135 citations · 406 across the 13 of their papers we have counts for
13 papers
Time-Reversal Invariant Topological Moiré Flatband: A Platform for the Fractional Quantum Spin Hall Effect
Yi-Ming Wu, Daniel Shaffer, Zhengzhi Wu +1
Motivated by recent observation of the quantum spin Hall effect in monolayer germanene and twisted bilayer transition-metal-dichalcogenides (TMDs), we study the topological phases…
Entanglement and Topology in Su-Schrieffer-Heeger Cavity Quantum Electrodynamics
Daniel Shaffer, Martin Claassen, Ajit Srivastava +1
Cavity materials are a frontier to investigate the role of light-matter interactions on the properties of electronic phases of matter. In this work, we raise a fundamental question…
Quantum Fractality on the Surface of Topological Insulators
Lakshmi Pullasseri, Daniel Shaffer, Luiz H. Santos
Three-dimensional topological insulators support gapless Dirac fermion surface states whose rich topological properties result from the interplay of symmetries and dimensionality.…
Enhanced triplet superconductivity in next generation ultraclean UTe2
Z. Wu, T. I. Weinberger, J. Chen +17
The unconventional superconductor UTe exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected…
Emergence of Chern Supermetal and Pair-Density Wave through Higher-Order Van Hove Singularities in the Haldane-Hubbard Model
Pedro Castro, Daniel Shaffer, Yi-Ming Wu +1
While advances in electronic band theory have brought to light new topological systems, understanding the interplay of band topology and electronic interactions remains a frontier…
Triplet Pair-Density Wave Superconductivity on the -flux Square Lattice
Daniel Shaffer, Luiz H. Santos
Pair-density waves (PDW) are superconducting states that spontaneously break translation symmetry in systems with time-reversal symmetry (TRS). Evidence for PDW has been seen in se…
Weak-Coupling Theory of Pair Density-Wave Instabilities in Transition Metal Dichalcogenides
Daniel Shaffer, F. J. Burnell, Rafael M. Fernandes
The possibility of realizing pair density wave (PDW) phases, in which Cooper pairs have a finite momentum, presents an interesting challenge that has been studied in a wide variety…
Unconventional Self-Similar Hofstadter Superconductivity from Repulsive Interactions
Daniel Shaffer, Jian Wang, Luiz H. Santos
Fractal Hofstadter bands have become widely accessible with the advent of moiré superlattices, opening the door to studies of the effect of interactions in these systems. In this w…
Chiral Superconductivity in UTe via Emergent Symmetry and Spin Orbit Coupling
Daniel Shaffer, Dmitry Chichinadze
A lot of attention has been drawn to superconductivity in UTe, with suggestions of time-reversal symmetry breaking triplet chiral superconducting order parameter. The chirality…
Theory of Hofstadter Superconductors
Daniel Shaffer, Jian Wang, Luiz H. Santos
We study mean-field states resulting from the pairing of electrons in time-reversal broken fractal Hofstadter bands, which arise in two-dimensional lattices where the unit cell tra…
Unexpected two-fold symmetric superconductivity in few-layer NbSe
Alex Hamill, Brett Heischmidt, Egon Sohn +13
Two-dimensional transition metal dichalcogenides (TMDs) have been attracting significant interest due to a range of properties, such as layer-dependent inversion symmetry, valley-c…
Crystalline Nodal Topological Superconductivity and Bogolyubov Fermi Surfaces in Monolayer NbSe
Daniel Shaffer, Jian Kang, F. J. Burnell +1
We present a microscopic calculation of the phase diagram of the Ising superconductor NbSe in presence of both in-plane magnetic field and Rashba spin-orbit coupling (SOC). R…
Irreversibility and Entanglement Spectrum Statistics in Quantum Circuits
Daniel Shaffer, Claudio Chamon, Alioscia Hamma +1
We show that in a quantum system evolving unitarily under a stochastic quantum circuit the notions of irreversibility, universality of computation, and entanglement are closely rel…