280 citations · 837 across the 17 of their papers we have counts for
18 papers
Topological Aspects of the Model in the Continuum and on the Lattice
Yichul Choi, Nathan Seiberg, Sahand Seifnashri +1
We discuss the continuum two-dimensional conformal field theory, whose target space is a two-torus. In addition to its standard zero-form internal symmetries, the model also has a…
Higher Connection in Open String Field Theory
Yichul Choi
We define a 2-form connection in the space of classical solutions of the bosonic open string field theory, using the open string star product and integration. The corresponding hig…
Noninvertible Symmetry-Resolved Affleck-Ludwig-Cardy Formula and Entanglement Entropy from the Boundary Tube Algebra
Yichul Choi, Brandon C. Rayhaun, Yunqin Zheng
We derive a refined version of the Affleck-Ludwig-Cardy formula for a 1+1d conformal field theory, which controls the asymptotic density of high energy states on an interval transf…
Generalized Tube Algebras, Symmetry-Resolved Partition Functions, and Twisted Boundary States
Yichul Choi, Brandon C. Rayhaun, Yunqin Zheng
We introduce a class of generalized tube algebras which describe how finite, non-invertible global symmetries of bosonic 1+1d QFTs act on operators which sit at the intersection po…
Non-invertible and higher-form symmetries in 2+1d lattice gauge theories
Yichul Choi, Yaman Sanghavi, Shu-Heng Shao +1
We explore exact generalized symmetries in the standard 2+1d lattice gauge theory coupled to the Ising model, and compare them with their continuum field theory coun…
Self-duality under gauging a non-invertible symmetry
Yichul Choi, Da-Chuan Lu, Zhengdi Sun
We discuss two-dimensional conformal field theories (CFTs) which are invariant under gauging a non-invertible global symmetry. At every point on the orbifold branch of CFTs,…
Quantization of Axion-Gauge Couplings and Non-Invertible Higher Symmetries
Yichul Choi, Matthew Forslund, Ho Tat Lam +1
We derive model-independent quantization conditions on the axion couplings (sometimes known as the anomaly coefficients) to the Standard Model gauge group $[SU(3)\times SU(2)\times…
Remarks on Boundaries, Anomalies, and Noninvertible Symmetries
Yichul Choi, Brandon C. Rayhaun, Yaman Sanghavi +1
What does it mean for a boundary condition to be symmetric with respect to a non-invertible global symmetry? We discuss two possible definitions in 1+1d. On the one hand, we call a…
Non-Invertible Gauss Law and Axions
Yichul Choi, Ho Tat Lam, Shu-Heng Shao
In axion-Maxwell theory at the minimal axion-photon coupling, we find non-invertible 0- and 1-form global symmetries arising from the naive shift and center symmetries. Since the G…
Non-invertible Time-reversal Symmetry
Yichul Choi, Ho Tat Lam, Shu-Heng Shao
In gauge theory, it is commonly stated that time-reversal symmetry only exists at or for a -periodic -angle. In this paper, we point out that in both the free Maxw…
Non-invertible Global Symmetries in the Standard Model
Yichul Choi, Ho Tat Lam, Shu-Heng Shao
We identify infinitely many non-invertible generalized global symmetries in QED and QCD for the real world in the massless limit. In QED, while there is no conserved Noether curren…
Higher Berry Phase of Fermions and Index Theorem
Yichul Choi, Kantaro Ohmori
When a quantum field theory is trivially gapped, its infrared fixed point is an invertible field theory. The partition function of the invertible field theory records the response…
Non-invertible Condensation, Duality, and Triality Defects in 3+1 Dimensions
Yichul Choi, Clay Cordova, Po-Shen Hsin +2
We discuss a variety of codimension-one, non-invertible topological defects in general 3+1d QFTs with a discrete one-form global symmetry. These include condensation defects from h…
Non-Invertible Duality Defects in 3+1 Dimensions
Yichul Choi, Clay Cordova, Po-Shen Hsin +2
For any quantum system invariant under gauging a higher-form global symmetry, we construct a non-invertible topological defect by gauging in only half of spacetime. This generalize…
Zeeman-splitting-induced Topological Nodal Structure and Anomalous Hall Conductivity in ZrTe
Yichul Choi, John W. Villanova, Kyungwha Park
We investigate the topological nodal structure of three-dimensional (3D) ZrTe driven by Zeeman splitting as a function of the direction of external magnetic (B) field by using…
Intrinsic Point Defects in Ultrathin 1T-PtSe2 Layers
Husong Zheng, Yichul Choi, Fazel Baniasadi +4
Among two-dimensional (2D) transition metal dichalcogenides (TMDs), platinum diselenide (PtSe2) stands at a unique place in the sense that it undergoes a phase transition from type…
Atomically Resolved Observation of Continuous Interfaces between As-grown MoS2 Monolayer and WS2/MoS2 Heterobilayer on SiO2
Fan Zhang, Zhixing Lu, Yichul Choi +6
Van der Waals (vdW) heterostructures synthesized through the chemical vapor deposition (CVD) method allow creation and tuning of intriguing electronic and optical properties of two…
Non-stationary Markovian Replication Process causing Diverse Diffusions
Yichul Choi, Hyun-Joo Kim
We introduce a single generative mechanism with which it is able to describe diverse non-stationary diffusions. A non-stationary Markovian replication process for steps is consider…