Skip To Main Content
Heqiu Li on Muck Rack

Heqiu Li

As seen in: Physical Review B
Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work. Claim your profile
Back to Heqiu Li’s profile

Articles by Heqiu Li

Contrasting twisted bilayer graphene and transition metal dichalcogenides for fractional Chern insulators: An emergent gauge picture

|
By Heqiu Li, Ying Su, Los Alamos, Yong Kim
| Physical Review B
The recent experimental discovery of the zero-field fractional Chern insulator (FCI) in twisted MoTe2 moiré superlattices has sparked immense interest in this exotic topological quantum state. The FCI has also been observed in previous experiments in magic angle twisted bilayer graphene (TBG) under a finite magnetic field of about 5 Tesla. Generally, the stabilization of FCI requires fine-tuning the topological band to satisfy certain conditions.
Open in Who Shared Issue with article?

Intertwined Van Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals

|
By Heqiu Li, Yong Kim, Hae-Young Kee
| Physical Review B
Recent experiments on kagome metals AV3Sb5 (A=Cs,Rb,K) indicated spontaneous time-reversal symmetry breaking in the charge density wave state in the absence of static magnetization. The loop current order (LCO) is proposed as its cause, but a microscopic model explaining the emergence of LCO through electronic correlations has not been firmly established. We show that the coupling between van Hove singularities with distinct mirror symmetries is a key ingredient to generate LCO ground state.
Open in Who Shared Issue with article?

Origin of $\ensuremath{\pi}$-shifted three-dimensional charge density waves in the kagom\'e metal ${A\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ $(A=\mathrm{Cs}, \mathrm{Rb}, \mathrm{K})$

|
By Heqiu Li, Xiaoyu LIU, Yong Kim, Hae-Young Kee
| Physical Review B
Abstract Understanding the nature of charge density wave (CDW) and superconductivity in the kagomé metal AV3Sb5 (A=Cs,Rb,K) is a recent subject of intensive study. Due to the presence of van Hove singularities, electron-electron interaction has been suggested to play an important role in the formation of such broken-symmetry states. Recent experiments show that the CDW order is three dimensional and it is staggered across different kagomé layers.
Open in Who Shared Issue with article?

Massive Dirac fermions in moir\'e superlattices: A route towards topological flat minibands and correlated topological insulators

|
By Ying Su, Los Alamos, Heqiu Li
| Physical Review B
Abstract We demonstrate a generic mechanism to realize topological flat minibands by confining massive Dirac fermions in a periodic moiré potential, which can be achieved in a heterobilayer of transition metal dichalcogenides. We show that the topological phase can be protected by the symmetry of moiré potential and survive to arbitrarily large Dirac band gap. We take the MoTe2/WSe2 heterobilayer as an example and find that the topological phase can be driven by a vertical electric field.
Open in Who Shared Issue with article?
Show More