Kin Fai Mak
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View article: Quantum oscillations between excitonic and quantum spin Hall insulators in moiré WSe2
Quantum oscillations between excitonic and quantum spin Hall insulators in moiré WSe2 Open
Quantum spin Hall insulators (QSHIs) and excitonic insulators (EIs) are prototypical topological and correlated states of matter, respectively. The topological phase transition between the two has attracted much theoretical interest but ex…
View article: Quantum oscillations in a dipolar excitonic insulator
Quantum oscillations in a dipolar excitonic insulator Open
Quantum oscillations in magnetization or resistivity are a defining feature of metals in a magnetic field. The phenomenon is generally not expected in insulators without a Fermi surface. Its observation in Kondo and other correlated insula…
View article: Moiré materials based on M-point twisting
Moiré materials based on M-point twisting Open
When two monolayer materials are stacked with a relative twist, an effective moiré translation symmetry emerges, leading to fundamentally different properties in the resulting heterostructure. As such, moiré materials have recently provide…
View article: Quantum oscillations in a dipolar excitonic insulator
Quantum oscillations in a dipolar excitonic insulator Open
Quantum oscillations in magnetization or resistivity are a defining feature of metals subject to an external magnetic field. The phenomenon is generally not expected in insulators without a Fermi surface. The observations of quantum oscill…
View article: Time-reversal symmetry breaking fractional quantum spin Hall insulator in moiré MoTe2
Time-reversal symmetry breaking fractional quantum spin Hall insulator in moiré MoTe2 Open
Twisted bilayer transition metal dichalcogenide semiconductors, which support flat Chern bands with enhanced interaction effects, realize a platform for fractional Chern insulators and fractional quantum spin Hall (FQSH) insulators. A rece…
View article: Relativistic Mott transition in strongly correlated artificial graphene
Relativistic Mott transition in strongly correlated artificial graphene Open
The realization of graphene has provided a bench-top laboratory for quantum electrodynamics. The low-energy excitations of graphene are two-dimensional massless Dirac fermions with opposite chiralities at the $\pm$K valleys of the graphene…
View article: 2D Theoretically Twistable Material Database
2D Theoretically Twistable Material Database Open
The study of twisted two-dimensional (2D) materials, where twisting layers create moiré superlattices, has opened new opportunities for investigating topological phases and strongly correlated physics. While systems such as twisted bilayer…
View article: Tuning Exciton Emission via Ferroelectric Polarization at a Heterogeneous Interface between a Monolayer Transition Metal Dichalcogenide and a Perovskite Oxide Membrane
Tuning Exciton Emission via Ferroelectric Polarization at a Heterogeneous Interface between a Monolayer Transition Metal Dichalcogenide and a Perovskite Oxide Membrane Open
We demonstrate the integration of a thin BaTiO3 (BTO) membrane with monolayer MoSe2 in a dual-gate device that enables in situ manipulation of the BTO ferroelectric polarization with a voltage pulse. While two-dimensional (2D) transition m…
View article: Correlated states controlled by tunable van Hove singularity in moiré WSe2
Correlated states controlled by tunable van Hove singularity in moiré WSe2 Open
Twisted bilayers of transition metal dichalcogenide semiconductors have enabled the discovery of superconductivity, ferromagnetism, correlated insulators and a series of new topological phases of matter. However, the connection between the…
View article: Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields
Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields Open
The study of exciton polarons has offered profound insights into the many-body interactions between bosonic excitations and their immersed Fermi sea within layered heterostructures. However, little is known about the properties of exciton …
View article: Unconventional superconductivity in twisted bilayer WSe2
Unconventional superconductivity in twisted bilayer WSe2 Open
Moiré materials have enabled the realization of flat electron bands and quantum phases that are driven by strong correlations associated with flat bands. Superconductivity has been observed, but solely, in graphene moiré materials. The abs…
View article: Tuning exciton emission via ferroelectric polarization at a heterogeneous interface between a monolayer transition metal dichalcogenide and a perovskite oxide membrane
Tuning exciton emission via ferroelectric polarization at a heterogeneous interface between a monolayer transition metal dichalcogenide and a perovskite oxide membrane Open
We demonstrate the integration of a thin BaTiO$_3$ (BTO) membrane with monolayer MoSe$_2$ in a dual gate device that enables in-situ manipulation of the BTO ferroelectric polarization with a voltage pulse. While two-dimensional (2D) transi…
View article: Observation of the double quantum spin Hall phase in moiré WSe2
Observation of the double quantum spin Hall phase in moiré WSe2 Open
Quantum spin Hall (QSH) insulators are a topologically protected phase of matter in two dimensions that can support non-dissipative spin transport. A hallmark of the phase is a pair of helical edge states surrounding an insulating bulk. A …
View article: Observation of the fractional quantum spin Hall effect in moiré MoTe2
Observation of the fractional quantum spin Hall effect in moiré MoTe2 Open
Quantum spin Hall (QSH) insulators are two-dimensional electronic materials that have a bulk band gap like an ordinary insulator but have topologically protected pairs of edge modes of opposite chiralities. To date, experimental studies ha…
View article: Realization of the Haldane Chern insulator in a moiré lattice
Realization of the Haldane Chern insulator in a moiré lattice Open
The Chern insulator displays a quantized Hall effect without Landau levels. Theoretically, this state can be realized by engineering complex next-nearest-neighbour hopping in a honeycomb lattice—the so-called Haldane model. Despite its pro…
View article: Emergence of ferromagnetism at the onset of moiré Kondo breakdown
Emergence of ferromagnetism at the onset of moiré Kondo breakdown Open
The interaction of a lattice of localized magnetic moments with a sea of conduction electrons in Kondo lattice models induces rich quantum phases of matter, such as Fermi liquids with heavily renormalized electronic quasiparticles, quantum…
View article: Emergence of ferromagnetism at the onset of moiré Kondo breakdown
Emergence of ferromagnetism at the onset of moiré Kondo breakdown Open
The interaction of a lattice of localized magnetic moments with a sea of conduction electrons in Kondo lattice models induces rich quantum phases of matter, such as Fermi liquids with heavily renormalized electronic quasiparticles, quantum…
View article: Perfect Coulomb drag in a dipolar excitonic insulator
Perfect Coulomb drag in a dipolar excitonic insulator Open
Excitonic insulators (EIs), arising in semiconductors when the electron-hole binding energy exceeds the band gap, are a solid-state prototype for bosonic phases of matter. Unlike the charged excitations that are frozen and unable to transp…
View article: Observation of spin polarons in a frustrated moiré Hubbard system
Observation of spin polarons in a frustrated moiré Hubbard system Open
The electron's kinetic energy plays a pivotal role in magnetism. While virtual electron hopping promotes antiferromagnetism in an insulator, the real process usually favors ferromagnetism. But in kinetically frustrated systems, such as hol…
View article: Integer and fractional Chern insulators in twisted bilayer MoTe2
Integer and fractional Chern insulators in twisted bilayer MoTe2 Open
Chern insulators, which are the lattice analogs of the quantum Hall states, can potentially manifest high-temperature topological orders at zero magnetic field to enable next-generation topological quantum devices 1-4 . To date, integer Ch…
View article: Integer and fractional Chern insulators in twisted bilayer MoTe2
Integer and fractional Chern insulators in twisted bilayer MoTe2 Open
Chern insulators, which are the lattice analogs of the quantum Hall states, can potentially manifest high-temperature topological orders at zero magnetic field to enable next-generation topological quantum devices. To date, integer Chern i…
View article: Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers
Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers Open
The spin Hall effect (SHE), in which electrical current generates transverse spin current, plays an important role in spintronics for the generation and manipulation of spin-polarized electrons 1–7. The phenomenon originates from spin-orbi…
View article: Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers
Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers Open
The spin Hall effect (SHE), in which electrical current generates transverse spin current, plays an important role in spintronics for the generation and manipulation of spin-polarized electrons. The phenomenon originates from spin-orbit co…
View article: Quantum Transport in Graphene Using Surface Acoustic Wave Resonators
Quantum Transport in Graphene Using Surface Acoustic Wave Resonators Open
Surface acoustic waves (SAWs) provide a contactless method for measuring the wavevector-dependent conductivity. This technique has been used to discover emergent length scales in the fractional quantum Hall regime of traditional, semicondu…
View article: A gate-tunable moiré Kondo lattice
A gate-tunable moiré Kondo lattice Open
Gate-tunable heavy fermions in a moiré Kondo lattice Authors: Wenjin Zhao, Bowen Shen, Zui Tao, Zhongdong Han, Kaifei Kang, Kenji Watanabe, Takashi Taniguchi, Kin Fai Mak, and Jie Shan arXiv:2211.00263; DOI: 10.48550/arXiv.2211.00263 Recom…
View article: Gate-tunable heavy fermions in a moiré Kondo lattice
Gate-tunable heavy fermions in a moiré Kondo lattice Open
The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated quantum matter. Traditionally, Kondo lattices are realized in …
View article: Gate-tunable heavy fermions in a moiré Kondo lattice
Gate-tunable heavy fermions in a moiré Kondo lattice Open
The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated quantum matter. Traditionally, Kondo lattices are realized in …
View article: Valley-coherent quantum anomalous Hall state in AB-stacked MoTe2/WSe2 bilayers
Valley-coherent quantum anomalous Hall state in AB-stacked MoTe2/WSe2 bilayers Open
Moiré materials provide fertile ground for the correlated and topological quantum phenomena. Among them, the quantum anomalous Hall (QAH) effect, in which the Hall resistance is quantized even under zero magnetic field, is a direct manifes…