189 citations · 691 across the 21 of their papers we have counts for
21 papers
Exchange-frustrated quadrupoles on the honeycomb lattice: Flavor-wave spectra, classical degeneracies and parton constructions
Partha Sarker, Han Ma, Urban F. P. Seifert
We study the quadrupolar Kitaev model, an honeycomb-lattice model with frustrated bond-dependent quadrupolar interactions. Using complementary methods and expanding around co…
Fixed Point Stability Switches from Attractive to Repulsive at 2d Pomeranchuk/Stoner Instabilities via Field-Theoretical RG
Han Ma
We study an interacting two-flavor fermionic system via field-theoretical functional renormalization group (RG). Each flavor, labeled by , has a dispersion of $E^{\pm}=c k^{2α…
Reclaiming the Lost Conformality in a non-Hermitian Quantum 5-state Potts Model
Yin Tang, Han Ma, Qicheng Tang +2
Conformal symmetry, emerging at critical points, can be lost when renormalization group fixed points collide. Recently, it was proposed that after collisions, real fixed points tra…
Anomalous quasiparticle lifetime in geometric quantum critical metals
Hao Song, Han Ma, Catherine Kallin +1
Metals can undergo geometric quantum phase transitions where the local curvature of the Fermi surface changes sign without a change in symmetry or topology. At the inflection point…
Symmetries and anomalies of Kitaev spin- models: Identifying symmetry-enforced exotic quantum matter
Ruizhi Liu, Ho Tat Lam, Han Ma +1
We analyze the internal symmetries and their anomalies in the Kitaev spin- models. Importantly, these models have a lattice version of a 1-form symmetry, denoted…
Hidden Critical Points in the Two-Dimensional model: Exact Numerical Study of a Complex Conformal Field Theory
Arijit Haldar, Omid Tavakol, Han Ma +1
The presence of nearby conformal field theories (CFTs) hidden in the complex plane of the tuning parameter was recently proposed as an elegant explanation for the ubiquity of "weak…
Fermi liquids beyond the forward scattering limit: the role of non-forward scatterings for scale invariance and instabilities
Han Ma, Sung-Sik Lee
Landau Fermi liquid theory is a fixed point theory of metals that includes the forward scattering amplitudes as exact marginal couplings. However, the fixed point theory that only…
spin liquids in the higher spin- Kitaev honeycomb model: An exact deconfined gauge structure in a non-integrable model
Han Ma
The higher spin Kitaev model prominently features the extensive locally conserved quantities the same as the spin- Kitaev honeycomb model, although it is not exactly solvable.…
Helical superfluid in a frustrated honeycomb Bose-Hubbard model
Tzu-Chi Hsieh, Han Ma, Leo Radzihovsky
We study a "helical" superfluid, a nonzero-momentum condensate in a frustrated bosonic model. At mean-field Bogoliubov level, such a novel state exhibits "smectic" fluctuation that…
Quenched random mass disorder in the large N theory of vector bosons
Han Ma
We study the critical bosonic O(N) vector model with quenched random mass disorder in the large N limit. Due to the replicated action which is sometimes not bounded from below, we…
Exact effective action for the O(N) vector model in the large N limit
Han Ma, Sung-Sik Lee
We present the Wilsonian effective action as a solution of the exact RG equation for the critical vector model in the large limit. Below four dimensions, the exact effec…
Constraints on beta functions in field theories
Han Ma, Sung-Sik Lee
The -functions describe how couplings run under the renormalization group flow in field theories. In general, all couplings that respect the symmetry and locality are generated…
Shadow of complex fixed point: Approximate conformality of Q>4 Potts model
Han Ma, Yin-Chen He
We study the famous example of weakly first order phase transitions in the 1+1D quantum Q-state Potts model at Q>4. We numerically show that these weakly first order transitions ha…
Higher Rank Deconfined Quantum Criticality at the Lifshitz Transition and the Exciton Bose Condensate
Han Ma, Michael Pretko
Deconfined quantum critical points are characterized by the presence of an emergent gauge field and exotic fractionalized particles, which exist as well-defined excitations only at…
Fracton topological order from Higgs and partial confinement mechanisms of rank-two gauge theory
Han Ma, Michael Hermele, Xie Chen
Fractons are gapped point-like excitations in topological ordered phases whose motion is constrained. They have been discovered in several gapped models but a unifying physic…
Recoverable Information and Emergent Conservation Laws in Fracton Stabilizer Codes
A. T. Schmitz, Han Ma, Rahul M. Nandkishore +1
We introduce a new quantity, that we term recoverable information, defined for stabilizer Hamiltonians. For such models, the recoverable information provides a measure of the topol…
Topological Entanglement Entropy of Fracton Stabilizer Codes
Han Ma, A. T. Schmitz, S. A. Parameswaran +2
Entanglement entropy provides a powerful characterization of two-dimensional gapped topological phases of quantum matter, intimately tied to their description by topological quantu…
Possible phases of the spin- model on a honeycomb lattice by boson-vortex duality
Han Ma
Motivated by recent numerical work, we use the boson-vortex duality to study the possible phases of the frustrated spin- XXZ models on the honeycomb lattice.…
Fracton topological order via coupled layers
Han Ma, Ethan Lake, Xie Chen +1
In this work, we develop a coupled layer construction of fracton topological orders in spatial dimensions. These topological phases have sub-extensive topological ground-stat…
Overlaying optical lattices for simulation of complex frustrated antiferromagnets
Zhi-Xin Chen, Han Ma, Mo-Han Chen +6
We present design techniques of special optical lattices that allow quantum simulation of spin frustration in two-dimensional systems. By carefully overlaying optical lattices with…
Formation and local symmetry of Holstein polaron in t-J model
Han Ma, T. K. Lee, Yan Chen
The formation and local symmetry of spin-lattice polaron has been investigated semiclassically in the planar Holstein t-J-like models within the exact diagonalization method. Due t…