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Unconventional Excitonic States with Phonon Sidebands in Layered Silicon Diphosphide
Ling Zhou, Junwei Huang, Lukas Windgaetter +16
Many-body interactions between quasiparticles (electrons, excitons, and phonons) have led to the emergence of new complex correlated states and are at the core of condensed matter…
Nature of novel moiré exciton states in WSe/WS heterobilayers
Mit H. Naik, Emma C. Regan, Zuocheng Zhang +18
Moiré patterns of transition metal dichalcogenide (TMD) heterobilayers have proven to be an ideal platform to host unusual correlated electronic phases, emerging magnetism, and cor…
Spin Splitting of Dopant Edge States in Magnetic Zigzag Graphene Nanoribbons
Raymond E. Blackwell, Fangzhou Zhao, Erin Brooks +7
Spin-ordered electronic states in hydrogen-terminated zigzag nanographene give rise to magnetic quantum phenomena that have sparked renewed interest in carbon-based spintronics. Zi…
Imaging local discharge cascades for correlated electrons in WS2/WSe2 moiré superlattices
Hongyuan Li, Shaowei Li, Mit H. Naik +14
Transition metal dichalcogenide (TMD) moiré heterostructures provide an ideal platform to explore the extended Hubbard model1 where long-range Coulomb interactions play a critical…
Electric Field Tunable Topological Phases in Graphene Nanoribbons
Fangzhou Zhao, Ting Cao, Steven G. Louie
Graphene nanoribbons (GNRs) possess distinct symmetry-protected topological phases. We show, through first-principles calculations, that by applying an experimentally accessible tr…
Imaging moiré flat bands in 3D reconstructed WSe2/WS2 superlattices
Hongyuan Li, Shaowei Li, Mit H. Naik +17
Moiré superlattices in transition metal dichalcogenide (TMD) heterostructures can host novel correlated quantum phenomena due to the interplay of narrow moiré flat bands and strong…
Bright excitons with negative-mass electrons
Kai-Qiang Lin, Chin Shen Ong, Sebastian Bange +15
Bound electron-hole excitonic states are generally not expected to form with charges of negative effective mass. We identify such excitons in a single layer of the semiconductor WS…
Valley-dependent Exciton Fine Structure and Autler-Townes Doublets from Berry Phases in Monolayer Molybdenum Diselenide
Chaw-Keong Yong, M. Iqbal Bakti Utama, Chin Shen Ong +12
The Berry phase of Bloch states can have profound effects on electron dynamics lead to novel transport phenomena, such as the anomalous Hall effect and the valley Hall effect. Rece…
Topological Band Engineering of Graphene Nanoribbons
Daniel J. Rizzo, Gregory Veber, Ting Cao +6
Topological insulators (TIs) are an emerging class of materials that host highly robust in-gap surface/interface states while maintaining an insulating bulk. While most notable sci…
Ultrasensitive Tunability of the Direct Bandgap of Two-dimensional InSe Flakes via Strain Engineering
Yang Li§, Tianmeng Wang§, Meng Wu§ +9
InSe, a member of the layered materials family, is a superior electronic and optical material which retains a direct bandgap feature from the bulk to atomically thin few-layers and…
Band Topology, Orbital Phase Winding, and Selection Rules in Excitonic Physics in Two Dimensions
Ting Cao, Meng Wu, Steven G. Louie
We show that band topology can dramatically change the photophysics of two-dimensional (2D) semiconductors. For systems in which states near the band extrema are of multiple orbita…
Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
Cheng Gong, Lin Li, Zhenglu Li +12
It has been long hoped that the realization of long-range ferromagnetic order in two-dimensional (2D) van der Waals (vdW) crystals, combined with their rich electronic and optical…
Topological Phases in Graphene Nanoribbons: Junction States, Spin Centers and Quantum Spin Chains
Ting Cao, Fangzhou Zhao, Steven G. Louie
Knowledge of the topology of the electronic ground state of materials has led to deep insights to novel phenomena such as the integer quantum Hall effect and fermion-number fractio…
Magnetic brightening and control of dark excitons in monolayer WSe2
Xiao-Xiao Zhang, Ting Cao, Zhengguang Lu +9
Monolayer transition metal dichalcogenide (TMDC) crystals, as direct-gap materials with unusually strong light-matter interaction, have attracted much recent attention. In contrast…
Temperature-induced topological phase transitions: promoted vs. suppressed non-trivial topology
Gabriel Antonius, Steven G. Louie
We determine the topological phase diagram of BiTl(SSe) as a function of doping and temperature from first-principles calculations. Due to electron\textendash phono…
Dispersion and lineshape of plasmon satellites in one, two and three dimensions
Derek Vigil-Fower, Steven G. Louie, Johannes Lischner
Using state-of-the-art many-body Green's function calculations based on the "GW plus cumulant" approach, we analyze the properties of plasmon satellites in the electron spectral fu…
Why do Collapsed Carbon Nanotubes Twist?
Hamid Reza Barzegar, Aiming Yan, Sinisa Coh +7
We study the collapsing and subsequent spontaneous twisting of a carbon nanotube by in-situ transmission electron microscopy. A custom-sized nanotube is first created in the micros…
Observing Atomic Collapse Resonances in Artificial Nuclei on Graphene
Yang Wang, Dillon Wong, Andrey V. Shytov +10
Relativistic quantum mechanics predicts that when the charge of a superheavy atomic nucleus surpasses a certain threshold, the resulting strong Coulomb field causes an unusual atom…
Probing the Role of Interlayer Coupling and Coulomb Interactions on Electronic Structure in Few-Layer MoSe2 Nanostructures
Aaron J. Bradley, Miguel M. Ugeda, Felipe H. da Jornada +11
Despite the weak nature of interlayer forces in transition metal dichalcogenide (TMD) materials, their properties are highly dependent on the number of layers in the few-layer two-…
Tunable Magnetism and Half-Metallicity in Hole-doped Monolayer GaSe
Ting Cao, Zhenglu Li, Steven G. Louie
We find, through first-principles calculations, that hole doping induces a ferromagnetic phase transition in monolayer GaSe. Upon increasing hole density, the average spin magnetic…
Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
Kaihui Liu, Liming Zhang, Ting Cao +7
Van der Waals (vdW) coupling is emerging as a powerful method to engineer and tailor physical properties of atomically thin two-dimensional (2D) materials. In graphene/graphene and…
Electron supercollimation in graphene and Dirac fermion materials using one-dimensional disorder potentials
SangKook Choi, Cheol-Hwan Park, Steven G. Louie
Electron supercollimation, in which a wavepacket is guided to move undistorted along a selected direction, is a highly desirable property that has yet been realized experimentally.…
Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
Miguel M. Ugeda, Aaron J. Bradley, Su-Fei Shi +9
Two-dimensional (2D) transition metal dichalcogenides (TMDs) exhibit novel electrical and optical properties and are emerging as a new platform for exploring 2D semiconductor physi…
Probing Excitonic Dark States in Single-layer Tungsten Disulfide
Ziliang Ye, Ting Cao, Kevin O'Brien +5
Transition metal dichalcogenide (TMDC) monolayer has recently emerged as an important two-dimensional semiconductor with promising potentials for electronic and optoelectronic devi…