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Correlated Insulator Moiré Bolometer
L. Elesin, A. L. Shilov, M. Kravtsov +14
Light incident on an insulator is generally not expected to turn it into a metal without invoking intense ultrafast excitation that leads to transient structural transitions. Here…
Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing
Swaroop Kumar Palai, Mateusz Dyksik, Nikodem Sokolowski +12
Stacking monolayers of transition metal dichalcogenides (TMDs) has led to the discovery of a plethora of new exotic phenomena, resulting from moiré pattern formation. Due to the at…
High spatial resolution charge sensing of quantum Hall states
Cheng-Li Chiu, Taige Wang, Ruihua Fan +5
Charge distribution offers a unique fingerprint of important properties of electronic systems, including dielectric response, charge ordering and charge fractionalization. We devel…
Quantifying the local mechanical properties of twisted double bilayer graphene
Alessandra Canetta, Sergio Gonzalez-Munoz, Viet-Hung Nguyen +13
Nanomechanical measurements of minimally twisted van der Waals materials remained elusive despite their fundamental importance for device realisation. Here, we use Ultrasonic Force…
Revealing flat bands and hybridization gaps in a twisted bilayer graphene device with microARPES
Zhihao Jiang, Kimberly Hsieh, Alfred J. H. Jones +7
Controlling the electronic structure of two-dimensional materials using the combination of twist angle and electrostatic doping is an effective means to induce emergent phenomena.…
Engineering the strain and interlayer excitons of 2D materials via lithographically engraved hexagonal boron nitride
Yu-Chiang Hsieh, Zhen-You Lin, Shin-Ji Fung +11
Strain engineering has quickly emerged as a viable option to modify the electronic, optical and magnetic properties of 2D materials. However, it remains challenging to arbitrarily…
Orbital Multiferroicity in Pentalayer Rhombohedral Graphene
Tonghang Han, Zhengguang Lu, Giovanni Scuri +8
Ferroic orders describe spontaneous polarization of spin, charge, and lattice degrees of freedom in materials. Materials featuring multiple ferroic orders, known as multiferroics,…
Perfect Coulomb drag and exciton transport in an excitonic insulator
Ruishi Qi, Andrew Y. Joe, Zuocheng Zhang +8
Strongly coupled two-dimensional electron-hole bilayers can give rise to novel quantum Bosonic states: electrons and holes in electrically isolated layers can pair into interlayer…
Perfect Coulomb drag in a dipolar excitonic insulator
Phuong X. Nguyen, Liguo Ma, Raghav Chaturvedi +4
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 t…
Revealing the conduction band and pseudovector potential in 2D moiré semiconductors
Abigail J. Graham, Heonjoon Park, Paul V. Nguyen +12
Stacking monolayer semiconductors results in moiré patterns that host many correlated and topological electronic phenomena, but measurements of the basic electronic structure under…
Transport Anisotropy in One-dimensional Graphene Superlattice in the High Kronig-Penney Potential Limit
Tianlin Li, Hanying Chen, Kun Wang +5
One-dimensional graphene superlattice subjected to strong Kronig-Penney (KP) potential is promising for achieving electron lensing effect, while previous studies utilizing the modu…
Cascade of multi-electron bubble phases in monolayer graphene at high Landau level filling
Fangyuan Yang, Ruiheng Bai, Alexander A. Zibrov +6
The phase diagram of an interacting two-dimensional electron system in a high magnetic field is enriched by the varying form of the effective Coulomb interaction, which depends str…
Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2
Fan Xu, Zheng Sun, Tongtong Jia +13
The interplay between strong correlations and topology can lead to the emergence of intriguing quantum states of matter. One well-known example is the fractional quantum Hall effec…
Uncovering the spin ordering in magic-angle graphene via edge state equilibration
Jesse C. Hoke, Yifan Li, Julian May-Mann +5
Determining the symmetry breaking order of correlated quantum phases is essential for understanding the microscopic interactions in their host systems. The flat bands in magic angl…
Evidence of the Coulomb gap in the density of states of MoS
Michele Masseroni, Tingyu Qu, Takashi Taniguchi +3
is an emergent van der Waals material that shows promising prospects in semiconductor industry and optoelectronic applications. However, its electronic properties…
Valley-polarized Exitonic Mott Insulator in WS2/WSe2 Moiré Superlattice
Zhen Lian, Yuze Meng, Lei Ma +14
Strongly enhanced electron-electron interaction in semiconducting moiré superlattices formed by transition metal dichalcogenides (TMDCs) heterobilayers has led to a plethora of int…
Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice
Zhen Lian, Dongxue Chen, Yuze Meng +9
Moiré superlattices of semiconducting transition metal dichalcogenides (TMDCs) enable unprecedented spatial control of electron wavefunctions in an artificial lattice with periodic…
Tunable quantum interferometer for correlated moiré electrons
Shuichi Iwakiri, Alexandra Mestre-Torà, Elías Portolés +8
Magic-angle twisted bilayer graphene (MATBG) can host an intriguing variety of gate-tunable correlated states, including superconducting and correlated insulator states. Junction-b…
Quantum control of exciton wavefunctions in 2D semiconductors
Jenny Hu, Etienne Lorchat, Xueqi Chen +5
Excitons -- bound electron-hole pairs -- play a central role in light-matter interaction phenomena, and are crucial for wide-ranging applications from light harvesting and generati…
Long distance electron-electron scattering detected with point contacts
Lev V. Ginzburg, Yuze Wu, Marc P. Röösli +15
We measure electron transport through point contacts in an electron gas in AlGaAs/GaAs heterostructures and graphene for a range of temperatures, magnetic fields and electron densi…
Energy gap of the even-denominator fractional quantum Hall state in bilayer graphene
Alexandre Assouline, Taige Wang, Haoxin Zhou +8
Bernal bilayer graphene hosts even denominator fractional quantum Hall states thought to be described by a Pfaffian wave function with nonabelian quasiparticle excitations. Here we…
Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
Xin Cong, Parisa Ali Mohammadi, Mingyang Zheng +4
The interactions between charges and excitons involve complex many-body interactions at high densities. The exciton-polaron model has been adopted to understand the Fermi sea scree…
Quadrupolar Excitons and Hybridized Interlayer Mott Insulator in a Trilayer Moiré Superlattice
Zhen Lian, Dongxue Chen, Lei Ma +13
Transition metal dichalcogenide (TMDC) moiré superlattices, owing to the moiré flatbands and strong correlation, can host periodic electron crystals and fascinating correlated phys…
Observation of Fractionally Quantized Anomalous Hall Effect
Heonjoon Park, Jiaqi Cai, Eric Anderson +17
The integer quantum anomalous Hall (QAH) effect is a lattice analog of the quantum Hall effect at zero magnetic field. This striking transport phenomenon occurs in electronic syste…