137 citations · 1.3k across the 39 of their papers we have counts for
18 papers · 1 filter
Correlated insulator in two Coulomb-coupled quantum wires
Yang-Zhi Chou, Sankar Das Sarma
Motivated by the recently discovered incompressible insulating phase in the bilayer graphene exciton experiment [arXiv:2306.16995], we study using bosonization two Coulomb-coupled…
Scaling theory of intrinsic Kondo and Hund's rule interactions in magic-angle twisted bilayer graphene
Yang-Zhi Chou, Sankar Das Sarma
Motivated by the recent studies of intrinsic local moments and Kondo-driven phases in magic-angle twisted bilayer graphene, we investigate the renormalization of Kondo coupling ($J…
Kondo lattice model in magic-angle twisted bilayer graphene
Yang-Zhi Chou, Sankar Das Sarma
We systematically study emergent Kondo lattice models from magic-angle twisted bilayer graphene using the topological heavy fermion representation. At the commensurate fillings, we…
Band manipulation and spin texture in interacting moiré helical edges
Yang-Zhi Chou, Jennifer Cano, J. H. Pixley
We develop a theory for manipulating the effective band structure of interacting helical edge states realized on the boundary of two-dimensional time-reversal symmetric topological…
Charge density wave and finite-temperature transport in minimally twisted bilayer graphene
Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau
We study phenomena driven by electron-electron interactions in the minimally twisted bilayer graphene (mTBLG) with a perpendicular electric field. The low-energy degrees of freedom…
Marginally localized edges of time-reversal symmetric topological superconductors
Yang-Zhi Chou, Rahul M. Nandkishore
We demonstrate that the one-dimensional helical Majorana edges of two-dimensional time-reversal symmetric topological superconductors (class DIII) can become gapless and insulating…
Finite-temperature spectroscopy of dirty helical Luttinger liquids
Tzu-Chi Hsieh, Yang-Zhi Chou, Leo Radzihovsky
We develop a theory of finite-temperature momentum-resolved tunneling spectroscopy (MRTS) for disordered, interacting two-dimensional topological-insulator edges. The MRTS compleme…
Nonmonotonic plasmon dispersion in strongly interacting Coulomb Luttinger liquids
Yang-Zhi Chou, Sankar Das Sarma
We demonstrate that the plasmon in one-dimensional Coulomb interacting electron fluids can develop a finite-momentum maxon-roton-like nonmonotonic energy-momentum dispersion. Such…
Anomalous localization at the boundary of an interacting topological insulator
Itamar Kimchi, Yang-Zhi Chou, Rahul M. Nandkishore +1
The boundary of a topological insulator (TI) hosts an anomaly restricting its possible phases: e.g. 3D strong and weak TIs maintain surface conductivity at any disorder if symmetry…
Magic-Angle Semimetals with Chiral Symmetry
Yang-Zhi Chou, Yixing Fu, Justin H. Wilson +2
We construct and solve a two-dimensional, chirally symmetric model of Dirac cones subjected to a quasiperiodic modulation. In real space, this is realized with a quasiperiodic hopp…
Superconductor versus insulator in twisted bilayer graphene
Yang-Zhi Chou, Yu-Ping Lin, Sankar Das Sarma +1
We present a simple model that we believe captures the key aspects of the competition between superconducting and insulating states in twisted bilayer graphene. Within this model,…
Localized surfaces of three dimensional topological insulators
Yang-Zhi Chou, Rahul M. Nandkishore, Leo Radzihovsky
We study the surface of a three-dimensional spin chiral topological insulator (class CII), demonstrating the possibility of its localization. This arises through an…
Magic-angle semimetals
Yixing Fu, E. J. König, J. H. Wilson +2
Breakthroughs in two-dimensional van der Waals heterostructures have revealed that twisting creates a moiré pattern that quenches the kinetic energy of electrons, allowing for exot…
Pinch Point Singularities of Tensor Spin Liquids
Abhinav Prem, Sagar Vijay, Yang-Zhi Chou +2
Recently, a new class of three-dimensional spin liquid models have been theoretically discovered, which feature generalized Coulomb phases of emergent symmetric tensor gauge…
Localization-Driven Correlated States of Two Isolated Interacting Helical Edges
Yang-Zhi Chou
We study the localization-driven correlated states among two isolated dirty interacting helical edges as realized at the boundaries of two-dimensional topological in…
Gapless insulating edges of dirty interacting topological insulators
Yang-Zhi Chou, Rahul M. Nandkishore, Leo Radzihovsky
We demonstrate that a combination of disorder and interactions in a two-dimensional bulk topological insulator can generically drive its helical edge insulating. We establish this…
Magnetic correlations in spin ice Ho2-xYxTi2O7 as revealed by neutron polarization analysis
L. J. Chang, Y. Su, Y. -J. Kao +6
We present single-crystal neutron-diffuse-scattering measurements with polarization analysis on the spin ice Ho2-xYxTi2O7 (x = 0, 0.3, and 1). At 2 K, the spin flip scattering patt…
Disorder from disorder and confinement in the quantum Ising model in the pyrochlore lattice
Chyh-Hong Chern, Chen-Nan Liao, Yang-Zhi Chou
At zero temperature, the classical antiferromagnetic Ising model on the pyrochlore lattice is a spin disorder phase of the critical spin correlation. It is a deconfined phase in th…