Publications (34)
Theory of polar domains in moiré heterostructures
Daniel Bennett
The discovery of unconventional ferroelectric behavior in twisted bilayers has prompted the consideration of moiré heterostructures as polar materials. However, misconceptions abo…
Imaging topological polar structures in marginally twisted 2D semiconductors
Thi-Hai-Yen Vu, Daniel Bennett, Gayani Nadeera Pallewella +16
Moire superlattices formed in van der Waals heterostructures due to twisting, lattice mismatch and strain present an opportunity for creating novel metamaterials with unique proper…
Polarization textures in crystal supercells with topological bands
Wojciech J. Jankowski, Daniel Bennett, Aneesh Agarwal +2
Two-dimensional materials are a highly tunable platform for studying the momentum space topology of the electronic wavefunctions and real space topology in terms of skyrmions, mero…
Stacking-engineered ferroelectricity and multiferroic order in van der Waals magnets
Daniel Bennett, Gabriel MartÃnez-Carracedo, Xu He +4
Two-dimensional (2D) materials that exhibit spontaneous magnetization, polarization or strain (referred to as ferroics) have the potential to revolutionize nanotechnology by enhanc…
Universal Symmetries in Twisted Moiré Materials
Mohammed M. Al Ezzi, Albert Zhu, Daniel Bennett +2
Two-dimensional multi-layer materials with an induced moiré pattern, either due to strain or relative twist between layers, provide a versatile platform for exploring strongly cor…
Electrostatics and domains in ferroelectric superlattices
Daniel Bennett, Maitane Muñoz-Basagoiti, Emilio Artacho
The electrostatics arising in ferroelectric/dielectric two-dimensional heterostructures and superlatitices is revisited here within a simplest Kittel model, in order to define a cl…
Lattice Relaxation in Moiré Heterobilayers
Christophe De Beule, Yiyang Lai, Liangtao Peng +2
We develop an analytical theory for lattice relaxation in twisted moiré heterobilayers, accounting for lattice mismatch, twist, external biaxial heterostrain, and different elasti…
A dynamical definition of f.g. virtually free groups
Daniel Bennett, Collin Bleak
We show that the class of finitely generated virtually free groups is precisely the class of demonstrable subgroups for R. Thompson's group . The class of demonstrable groups fo…
Stacking-dependent electronic structure of ultrathin perovskite bilayers
Daniel T. Larson, Daniel Bennett, Abduhla Ali +4
Twistronics has received much attention as a new method to manipulate the properties of 2D van der Waals structures by introducing moiré patterns through a relative rotation betwe…
Generalized relation between electromechanical responses at fixed voltage and fixed electric field
Daniel Bennett, Daniel Tanner, Philippe Ghosez +2
We present a general relation between the electromechanical couplings of infinitesimal strain and electric field to arbitrary order, measured at fixed voltage and at fixed electric…
Photo-induced electronic and spin topological phase transitions in monolayer bismuth
Bo Peng, Gunnar F. Lange, Daniel Bennett +3
Ultrathin bismuth exhibits rich physics including strong spin-orbit coupling, ferroelectricity, nontrivial topology, and light-induced structural dynamics. We use \textit{ab initio…
Pseudo-proper two-dimensional electron gas formation
Daniel Bennett, Pablo Aguado-Puente, Emilio Artacho +1
In spite of the interest in the two-dimensional electron gases (2DEGs) experimentally found at surfaces and interfaces, important uncertainties remain about the observed insulator-…
Tunable photostriction of halide perovskites through energy dependent photoexcitation
Bo Peng, Daniel Bennett, Ivona BraviÄ +1
Halide perovskites exhibit giant photostriction, that is, volume or shape changes upon illumination. However, the microscopic origin of this phenomenon remains unclear and there ar…
Twisted bilayer graphene from first-principles: structural and electronic properties
Albert Zhu, Daniel Bennett, Daniel T. Larson +3
We present a comprehensive first-principles study of twisted bilayer graphene (tBLG) for a wide range of twist angles, with a focus on structural and electronic properties. By empl…
Disorder-induced symmetry breaking in moiré bands of marginally twisted bilayer MoS
Pablo Reséndiz-Vázquez, Christophe de Beule, Thi-Hai-Yen Vu +8
Twisted transition-metal dichalcogenides host highly tunable moiré potentials, flat bands, and correlated electronic phases, yet the role of disorder in shaping these emergent pro…
Accurate and efficient localized basis sets for two-dimensional materials
Daniel Bennett, Michele Pizzochero, Javier Junquera +1
First-principles density functional theory (DFT) codes which employ a localized basis offer advantages over those which use plane-wave bases, such as better scaling with system siz…
Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces
Daniel Bennett, Pablo Aguado-Puente, Emilio Artacho +1
The phenomenological theory for the polar instability giving rise to a two-dimensional electron gas at perovskite interfaces is hereby extended to include the coupling to perovskit…
Wavefunction textures in twisted bilayer graphene from first principles
Albert Zhu, Daniel Bennett, Daniel T. Larson +3
Motivated by recent experiments probing the wavefunctions of magic-angle twisted bilayer graphene (tBLG), we perform large-scale first-principles calculations of tBLG with full ato…
Plasmonic polarization sensing of electrostatic superlattice potentials
Shuai Zhang, Jordan Fonseca, Daniel Bennett +15
Plasmon polaritons are formed by coupling light with delocalized electrons. The half-light and half-matter nature of plasmon polaritons endows them with unparalleled tunability via…
Band structure engineering using a moiré polar substrate
Xirui Wang, Cheng Xu, Samuel Aronson +11
Applying long wavelength periodic potentials on quantum materials has recently been demonstrated to be a promising pathway for engineering novel quantum phases of matter. Here, we…
Asymmetric dynamical charges in two-dimensional ferroelectrics
Daniel Bennett, Philippe Ghosez
Ferroelectricity is commonly understood in terms of dynamical charges, which represent the dipole moments generated by atomic displacements or the forces induced by electric fields…
2D Nitride Ordered Alloys: A Novel Class of Ultra-Wide Bandgap Semiconductors
Raagya Arora, Ariel R. Barr, Daniel Bennett +3
Ultra-wide bandgap (UWBG) semiconductors are poised to transform power electronics by surpassing the capabilities of established wide bandgap materials, such as GaN and SiC, owing…
Switching topological states via uniaxial strain in 2D materials
Joshua J. Sanchez, Raagya Aurora, Daniel Bennett +3
In topological materials, dissipationless edge currents are protected against local defect scattering by the bulk inverted band structure and band gap. We propose that large uniaxi…
Polar meron-antimeron networks in strained and twisted bilayers
Daniel Bennett, Gaurav Chaudhary, Robert-Jan Slager +2
Out-of-plane polar domain structures have recently been discovered in strained and twisted bilayers of inversion symmetry broken systems such as hexagonal boron nitride. Here we sh…
Electrically tunable stacking domains and ferroelectricity in moiré superlattices
Daniel Bennett, Benjamin Remez
It is well known that stacking domains form in moiré superlattices due to the competition between the interlayer van der Waals forces and intralayer elastic forces, which can be r…
Flexoelectric radial polarization of single-walled nanotubes from first-principles
Daniel Bennett
Flexoelectricity is the polar response of an insulator to strain gradients such as bending. While the size dependence of this effect makes it weak in bulk systems in comparison to…
Flat and tunable moire phonons in twisted transition-metal dichalcogenides
Alejandro Ramos-Alonso, Benjamin Remez, Daniel Bennett +2
Displacement fields are one of the main tuning knobs employed to engineer flat electronic band dispersions in twisted van der Waals multilayers. Here, we show that electric fields…
Hybrid Electronic-Ionic Ferroelectricity in Superlubric van der Waals Heterostructures
Jing Huang, Jun Kang, Daniel Bennett
One strategy to lower the switching barrier in a sliding ferroelectric (sFE) is to insert an incommensurate spacer to reduce sliding friction, creating a superlubric sliding ferroe…
A measurement of the energy and timing resolution of GlueX Forward Calorimeter using an electron beam
Kei Moriya, John P. Leckey, Matthew R. Shepherd +11
The performance of the GlueX Forward Calorimeter was studied using a small version of the detector and a variable energy electron beam derived from the Hall B tagger at Jefferson L…
Theory of polarization textures in crystal supercells
Daniel Bennett, Wojciech J. Jankowski, Gaurav Chaudhary +2
Recently, topologically nontrivial polarization textures have been predicted and observed in nanoscale systems. While these polarization textures are interesting and promising in t…
Shift photocurrent vortices from topological polarization textures
Aneesh Agarwal, Wojciech J. Jankowski, Daniel Bennett +1
Following the recent interest in van der Waals (vdW) ferroelectrics, topologically nontrivial polar structures have been predicted to form in twisted bilayers. However, these struc…
Beyond Intrinsic Motivation: The Role of Autonomous Motivation in User Experience
Daniel Bennett, Elisa Mekler
Motivation and autonomy are fundamental concepts in Human-Computer Interaction (HCI), yet in User Experience (UX) research they have remained surprisingly peripheral. We draw on Se…
Twisted bilayer graphene revisited: minimal two-band model for low-energy bands
Daniel Bennett, Daniel T. Larson, Louis Sharma +2
An accurate description of the low-energy electronic bands in twisted bilayer graphene (tBLG) is of great interest due to their relation to correlated electron phases, such as supe…
A multi-ion optical clock with uncertainty
Melina Filzinger, Martin R. Steinel, Jian Jiang +4
Today's most accurate clocks are based on laser spectroscopy of electronic transitions in single trapped ions and feature fractional frequency uncertainties below …