423 citations · 1.2k across the 13 of their papers we have counts for
13 papers
Helical trilayer graphene: a moiré platform for strongly-interacting topological bands
Li-Qiao Xia, Sergio C. de la Barrera, Aviram Uri +9
Quantum geometry of electronic wavefunctions results in fascinating topological phenomena. A prominent example is the intrinsic anomalous Hall effect (AHE) in which a Hall voltage…
Electronic ratchet effect in a moiré system: signatures of excitonic ferroelectricity
Zhiren Zheng, Xueqiao Wang, Ziyan Zhu +17
Electronic ferroelectricity represents a new paradigm where spontaneous symmetry breaking driven by electronic correlations, in contrast to traditional lattice-driven ferroelectric…
Magic-angle helical trilayer graphene
Trithep Devakul, Patrick J. Ledwith, Li-Qiao Xia +4
We propose helical trilayer graphene (HTG), a helical structure featuring identical rotation angles between three consecutive layers of graphene, as a unique a…
Superconductivity and strong interactions in a tunable moiré quasiperiodic crystal
Aviram Uri, Sergio C. de la Barrera, Mallika T. Randeria +10
Electronic states in quasiperiodic crystals generally preclude a Bloch description, rendering them simultaneously fascinating and enigmatic. Owing to their complexity and relative…
Cascade of isospin phase transitions in Bernal bilayer graphene at zero magnetic field
Sergio C. de la Barrera, Samuel Aronson, Zhiren Zheng +5
Emergent phenomena arising from the collective behavior of electrons is generally expected when Coulomb interactions dominate over the kinetic energy, as in delocalized quasipartic…
Direct measurement of ferroelectric polarization in a tunable semimetal
Sergio C. de la Barrera, Qingrui Cao, Yang Gao +7
Ferroelectricity, the electrostatic counterpart to ferromagnetism, has long been thought to be incompatible with metallicity due to screening of electric dipoles and external elect…
Proximity-induced superconducting gap in the quantum spin Hall edge state of monolayer WTe
Felix Lüpke, Dacen Waters, Sergio C. de la Barrera +5
The quantum spin Hall (QSH) state was recently demonstrated in monolayers of the transition metal dichalcogenide 1T'-WTe and is characterized by a band gap in the two-dimension…
Magnitude of the Current in Two-Dimensional Interlayer Tunneling Devices
Randall M. Feenstra, Sergio C. de la Barrera, Jun Li +2
Using the Bardeen tunneling method with first-principles wave functions, computations are made of the tunneling current in graphene / hexagonal-boron-nitride / graphene (G/h-BN/G)…
Tuning Ising superconductivity with layer and spin-orbit coupling in two-dimensional transition-metal dichalcogenides
Sergio C. de la Barrera, Michael R. Sinko, Devashish P. Gopalan +8
Systems that simultaneously exhibit superconductivity and spin-orbit coupling are predicted to provide a route toward topological superconductivity and unconventional electron pair…
Thickness characterization of atomically-thin WSe on epitaxial graphene by low-energy electron reflectivity oscillations
Sergio C. de la Barrera, Yu-Chuan Lin, Sarah M. Eichfeld +4
In this work, low-energy electron microscopy is employed to probe structural as well as electronic information in few-layer WSe on epitaxial graphene on SiC. The emergence of u…
Formation of hexagonal Boron Nitride on Graphene-covered Copper Surfaces
Devashish P. Gopalan, Patrick C. Mende, Sergio C. de la Barrera +10
Graphene-covered copper surfaces have been exposed to borazine, (BH)3(NH)3, with the resulting surfaces characterized by low-energy electron microscopy. Although the intent of the…
Theory of resonant tunneling in bilayer-graphene/hexagonal-boron-nitride heterostructures
Sergio C. de la Barrera, Randall M. Feenstra
A theory is developed for calculating vertical tunneling current between two sheets of bilayer graphene separated by a thin, insulating layer of hexagonal boron nitride, neglecting…
Theory of Graphene-Insulator-Graphene Tunnel Junctions
S. C. de la Barrera, Qin Gao, R. M. Feenstra
Graphene-insulator-graphene vertical tunneling structures are discussed from a theoretical perspective. Momentum conservation in such devices leads to highly nonlinear current-volt…