295 citations · 807 across the 37 of their papers we have counts for
38 papers
Distinct lattice and charge excitations in AV3Sb5 kagome superconductors
Dongjin Oh, Stefan Enzner, Lennart Klebl +12
The kagome superconductor family AV3Sb5 (A=Cs, Rb, K) provides a rich platform for exploring diverse electronic symmetry breaking phenomena, including superconductivity and various…
Correlations between superconducting and resistive anisotropies
Sayan Banerjee, Harley D. Scammell, Mathias S. Scheurer
There are multiple possible origins of transport anisotropies in metals and superconductors. For instance, rotational symmetry can be spontaneously broken in the normal state as a…
Group theory method for extracting order parameters from scanning tunneling microscopy data
Julian Ingham, Yu-Xiao Jiang, M. Zahid Hasan +1
Scanning tunneling microscopy (STM) is a powerful local probe of correlated electronic states. Here we present a group theoretical framework for the analysis of STM data, filtering…
Spin-orbit crossover and the origin of magnetic torque in kagome metals
Mathias S. Scheurer, Harley D. Scammell
Recent experiments on the kagome metal CsVSb reveal a curious phase transition-like feature: a nematic magnetic torque response that abruptly sets in at K,…
Exciton condensation from level repulsion: application to bilayer graphene
Harley D. Scammell, Oleg P. Sushkov
Exciton condensation in semiconductors and semimetals has long been predicted but remains elusive. In a semiconductor, condensation occurs when the exciton binding energy matches t…
Zener tunnelling in biased bilayer graphene via analytic continuation of semiclassical theory
Harley Scammell, Oleg P. Sushkov
Employing a semiclassical method based on analytic continuation, we compute the electron-hole pair production rate in biased bilayer graphene subject to an in-plane electric field.…
Moiré -valley bilayers: quasi-one-dimensional physics, unconventional spin textures and twisted van Hove singularities
Julian Ingham, Mathias S. Scheurer, Harley D. Scammell
Motivated by the discovery of quasi-two-dimensional kagome metals AVSb, we consider the theory of twisted bilayers in which the Fermi surface is near the -point. Surpris…
Vestigial Order from an Excitonic Mother State in Kagome Superconductors VSb
Julian Ingham, Ronny Thomale, Harley D. Scammell
Alongside high-temperature charge order and superconductivity, kagome metals exhibit signatures of time-reversal symmetry breaking and nematicity which appear to depend strongly on…
Theory of Band Gap Reduction Due to Conduction Electrons in 2D TMDs: Imaginary Frequency Formalism
Jack N. Engdahl, Harley D. Scammell, Dmitry K. Efimkin +1
Two Dimensional (2D) Transition Metal Dichalcogenides (TMDs) possess a large direct band gap which has been experimentally observed to shrink with increasing charge carrier density…
Theory of unconventional magnetism in a Cu-based kagome metal
Anja Wenger, Armando Consiglio, Hendrik Hohmann +6
Kagome metals have established a new arena for correlated electron physics. To date, the predominant experimental evidence centers around unconventional charge order, nematicity, a…
Theory of excitonic order in kagome metals ScVSn and LuNbSn
Julian Ingham, Armando Consiglio, Domenico di Sante +2
We argue that kagome metals can feature an excitonic condensate of unconventional nature. Studying the recently discovered variants ScVSn and LuNbSn we identify ele…
Excitons in Atomically Thin TMD in Electric and Magnetic Fields
Jack N. Engdahl, Harley D. Scammell, Dmitry K. Efimkin +1
The magnetic field dependence of photoabsorption provides direct insights into the band structure of semiconductors. It is perhaps surprising that there is a large discrepancy betw…
Anomalous magnetic flux via junction twist-angle in a triplet-superconducting transmon qubit
Sebastián Domínguez-Calderón, Harley D. Scammell
Superconducting transmon qubits with strong anharmonicity and insensitivity to offset charge are highly desirable for low-error implementation. In this work we propose a c-axis jun…
Displacement-field-tunable superconductivity in an inversion-symmetric twisted van der Waals heterostructure
Harley D. Scammell, Mathias S. Scheurer
We investigate the superconducting properties of inversion-symmetric twisted trilayer graphene by considering different parent states, including spin-singlet, triplet, and SO(4) de…
Quadratic Dirac fermions and the competition of ordered states in twisted bilayer graphene
Julian Ingham, Tommy Li, Mathias S. Scheurer +1
Magic-angle twisted bilayer graphene (TBG) exhibits a captivating phase diagram as a function of doping, featuring superconductivity and a variety of insulating and magnetic states…
Exciton condensation in biased bilayer graphene
Harley D. Scammell, Oleg P. Sushkov
We consider suspened bilayer graphene under applied perpendicular electric bias field that is known to generate a single particle gap and a related electric polarization ${\ca…
Tunable superconductivity and Möbius Fermi surfaces in an inversion-symmetric twisted van der Waals heterostructure
Harley D. Scammell, Mathias S. Scheurer
We study theoretically a moiré superlattice geometry consisting of mirror-symmetric twisted trilayer graphene surrounded by identical transition metal dichalcogenide layers. We sho…
Dynamical screening and excitonic bound states in biased bilayer graphene
Harley D. Scammell, Oleg P. Sushkov
Excitonic bound states are characterised by a binding energy and a single-particle band gap . This work provides a theoretical description for both strong ()…
Chiral excitonic order from twofold van Hove singularities in kagome metals
Harley D. Scammell, Julian Ingham, Tommy Li +1
Recent experiments on kagome metals AVSb (A=K,Rb,Cs) [M. Kang et al., Nat. Phys. 18, 301-308 (2022)] identify twofold van Hove singularities (TvHS) with opposite concavity…
Theory of zero-field superconducting diode effect in twisted trilayer graphene
Harley D. Scammell, J. I. A. Li, Mathias S. Scheurer
In a recent experiment [Lin et al., arXiv:2112.07841], the superconducting phase hosted by a heterostructure of mirror-symmetric twisted trilayer graphene and WSe was shown to…
Zero-field superconducting diode effect in small-twist-angle trilayer graphene
Jiang-Xiazi Lin, Phum Siriviboon, Harley D. Scammell +7
The critical current of a superconductor can be different for opposite directions of current flow when both time-reversal and inversion symmetry are broken. %When time-reversal and…
A new flavor of correlation and superconductivity in small twist-angle trilayer graphene
Phum Siriviboon, Jiang-Xiazi Lin, Xiaoxue Liu +8
When layers of graphene are rotationally misaligned by the magic angle, the moiré superlattice features extremely flat bands. Due to the enhanced density of states, the Coulomb int…
Nested Fermi surfaces and correlated electronic phases in hole-doped semiconductor quantum wells
Tommy Li, Julian Ingham, Harley D. Scammell
We demonstrate the existence of novel interaction effects in hole-doped semiconductor quantum wells which are connected to dramatic changes in the Fermi surface geometry occurring…
Intrinsic first and higher-order topological superconductivity in a doped topological insulator
Harley D. Scammell, Julian Ingham, Max Geier +1
We explore higher order topological superconductivity in an artificial Dirac material with intrinsic spin-orbit coupling, which is a doped topological insulator in t…