Article
Nanoscience & Nanotechnology
Hyeonjun Baek, Mauro Brotons-Gisbert, Aidan Campbell, Valerio Vitale, Johannes Lischner, Kenji Watanabe, Takashi Taniguchi, Brian D. Gerardot
Summary: Trapped excitons in a molybdenum diselenide/tungsten diselenide heterobilayer device can serve as a sensitive optical probe for carrier filling. By mapping the spatial positions of individual trapped excitons, it is possible to spectrally track the emitters as the moire lattice is filled with excess carriers, providing insights into Coulomb interaction energies and visualizing charge correlated states.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Daniel Erkensten, Samuel Brem, Rauel Perea-Causin, Joakim Hagel, Fedele Tagarelli, Edoardo Lopriore, Andras Kis, Ermin Malic
Summary: This study reveals two intriguing interaction regimes in WSe2 homobilayers: a low-dipole regime characterized by interactions between intralayer-like excitons and a high-dipole regime involving interactions between interlayer-like excitons. The study provides insights into the electrical tunability of exciton-exciton interactions in atomically thin semiconductors.
Article
Chemistry, Multidisciplinary
Yawen Liu, Yahe Wu, Huan Liang, Hongtu Xu, Yen Wei, Yan Ji
Summary: In this study, researchers developed a rewritable conductive coating using poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which enables reconfigurable, adaptive, and precisely controllable electro-driven motions in liquid crystalline elastomers (LCEs) actuators. This allows for the repeated use of the same actuator for various purposes without disposal. Different PEDOT:PSS layers can be coated onto different regions, enabling the assembly of different actuation behaviors under a single input voltage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
A. A. Zabolotnykh, V. A. Volkov
Summary: This paper studies cyclotron resonance in a gated two-dimensional electron system, analyzing its absorption properties and redshift phenomenon, which is found to be dependent on the electron density and controllable by varying the gate voltage. The controllability of cyclotron resonance in gated two-dimensional electron systems opens up new possibilities for exploring this phenomenon in both physics and applications.
Review
Chemistry, Multidisciplinary
Yuanda Liu, Ahmed Elbanna, Weibo Gao, Jisheng Pan, Zexiang Shen, Jinghua Teng
Summary: This article presents a general view of interlayer excitons in 2D van der Waals heterostructures and the state-of-the-art developments. By employing staggered type-II band alignment, the interlayer direct bandgap can be expanded, enabling exciton devices at room temperature and observation of quantum behaviors.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Jue Wang, Qianhui Shi, En-Min Shih, Lin Zhou, Wenjing Wu, Yusong Bai, Daniel Rhodes, Katayun Barmak, James Hone, Cory R. Dean, X-Y Zhu
Summary: In this study, two distinct phase transitions for interlayer excitons in MoSe2/WSe2 heterobilayer were revealed using time and spatially resolved photoluminescence imaging, setting fundamental limits for achieving quantum states of interlayer excitons. The transitions include trapped excitons in moire potential transforming into modestly mobile exciton gas, and then into highly mobile charge separated electron-hole plasma, confirmed as the Mott transition through photoconductivity measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Mauro Brotons-Gisbert, Hyeonjun Baek, Aidan Campbell, Kenji Watanabe, Takashi Taniguchi, Brian D. Gerardot
Summary: In gate-tunable 2H-MoSe2/WSe2 heterobilayers, researchers observed a continuous evolution from a few trapped interlayer excitons (IXs) to an ensemble of IXs with both triplet- and singlet-spin configurations. Electron doping led to the formation of three different species of localized negative trions with contrasting spin-valley configurations. The study highlights the important role of exciton-exciton interactions and Fermi-level control in highly tunable quantum materials.
Article
Multidisciplinary Sciences
Elyse Barre, Ouri Karni, Erfu Liu, Aidan L. O'Beirne, Xueqi Chen, Henrique B. Ribeiro, Leo Yu, Bumho Kim, Kenji Watanabe, Takashi Taniguchi, Katayun Barmak, Chun Hung Lui, Sivan Refaely-Abramson, Felipe H. da Jornada, Tony F. Heinz
Summary: Interlayer excitons, electron-hole pairs bound across two monolayer van der Waals semiconductors, offer promising electrical tunability and localizability. The dielectric response of interlayer excitons was directly measured using their static electric dipole moment, and an intrinsic radiative lifetime and transition characteristics were determined. This study identifies a momentum-indirect emission mechanism and emphasizes the importance of characterizing absorption for applications relying on light-matter interactions.
Article
Multidisciplinary Sciences
Wenjie Deng, Zilong Zheng, Jingzhen Li, Rongkun Zhou, Xiaoqing Chen, Dehui Zhang, Yue Lu, Chongwu Wang, Congya You, Songyu Li, Ling Sun, Yi Wu, Xuhong Li, Boxing An, Zheng Liu, Qi Jie Wang, Xiangfeng Duan, Yongzhe Zhang
Summary: This study presents the design of a super miniaturized near-infrared spectrometer based on two-dimensional vdWH, which achieves electrically tunable infrared photoresponse by introducing metal atoms. The design features a ultra-small device footprint and simple fabrication process, offering a promising solution for on-chip infrared spectroscopy.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jonas D. D. Ziegler, Yeongsu Cho, Sophia Terres, Matan Menahem, Takashi Taniguchi, Kenji Watanabe, Omer Yaffe, Timothy C. C. Berkelbach, Alexey Chernikov
Summary: 2D hybrid perovskites have attracted significant attention in material research for light-harvesting and -emitting applications. In this study, a method of interfacing ultrathin sheets of perovskites with few-layer graphene and hexagonal boron nitride is demonstrated, enabling gate-tunable control of light emission and absorption. The findings reveal the emergence of both negatively and positively charged excitons, with high binding energies and excellent mobility. This research introduces the physics of interacting mixtures of optical and electrical excitations to the broad family of 2D inorganic-organic nanostructures, highlighting the potential of 2D perovskites as a promising material platform for electrically modulated light-emitters and exciton transistors.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jonas Zipfel, Koloman Wagner, Marina A. Semina, Jonas D. Ziegler, Takashi Taniguchi, Kenji Watanabe, Mikhail M. Glazov, Alexey Chernikov
Summary: In this study, we experimentally and theoretically investigate the electron recoil effect in the interaction of excitons with free charge carriers. We use time-resolved analysis of recoil line shapes to explore the nonequilibrium states of exciton-carrier complexes and reveal the cooling process of the carriers and its influencing factors. Additionally, by comparing recoil analysis with luminescence rise times, we gain further insight into trion dynamics.
Article
Physics, Applied
Habib Ullah, Jinyang Li, Anas Mujahid, Yufeng Li, Yafen Wang, Irfan Ahmed, Yanpeng Zhang
Summary: The study reports the intensity-noise correlation and intensity-difference squeezing of hybrid signals from different phases of Pr3+: YPO4 and Eu3+: YPO4 crystals. Competition between FL and SP-FWM determines the amplitude and line shape, with the correlation amplitude switching from positive to negative due to strong double dressing in one phase. The results suggest a tunable correlation filter model for applications such as quantum communications, with amplitude and line shape controlled by gate position, frequency detuning, and laser power.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Marie-Christin Hessenbuettel, Thorsten Deilmann, Peter Krueger, Michael Rohlfing
Summary: Heterostructures of two-dimensional transition-metal dichalcogenides and ferromagnetic substrates show different coupling and exciton wave functions, resulting in varied responses to magnetic fields. The findings suggest g factors as a tool for investigating exciton characteristics and shedding light on the quantummechanical interplay of magnetic and optical properties.
Article
Chemistry, Multidisciplinary
Daniel N. Shanks, Fateme Mahdikhanysarvejahany, Trevor G. Stanfill, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Brian J. LeRoy, John R. Schaibley
Summary: We report the unidirectional transport of charge neutral interlayer exciton (IX) quasiparticles in a nano-scale channel in MoSe2-WSe2 heterostructure, enabling the development of low loss excitonic circuits and the study of bosonic transport in one-dimensional channels.
Article
Chemistry, Physical
Mengqi Li, Dongqing Li
Summary: This study developed a novel technique for controllable cargo delivery using electric pulses, demonstrating loading and releasing of model cargos in droplet carriers under electric pulses. By controlling the amplitude of the pulses, cargos can be sorted and targeted delivery can be achieved. The method shows flexibility for both biological and non-biological cargo delivery.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Tatiana Latychevskaia, Colin Robert Woods, Yi Bo Wang, Matthew Holwill, Eric Prestat, Sara Mustafi, Sarah J. Haigh, Konstantin S. Novoselov
Summary: This study demonstrates the possibility of directly measuring scattering parameters through the intensity distribution of spots in CBED patterns. A method for recovering atomic scattering parameters from CBED patterns is proposed and validated through experiments and simulations.
Article
Chemistry, Multidisciplinary
Shen Lai, Zhaowei Zhang, Naizhou Wang, Abdullah Rasmita, Ya Deng, Zheng Liu, Wei-bo Gao
Summary: By studying valleytronics in two-dimensional materials, we have successfully improved the performances of valleytronic transistors in monolayer MoS2 and WSe2 devices, with valley on-off ratios improved up to three orders of magnitude greater compared to previous reports. This research provides a promising way for the electrically controllable manipulation of valley degree of freedom toward practical device applications.
Article
Chemistry, Multidisciplinary
Ruihua He, Max Meunier, Zhaogang Dong, Hongbing Cai, Weibo Gao, Jesus Zuniga-Perez, Xiaogang Liu
Summary: Inorganic halide perovskite quantum dots have been widely used as efficient active materials in optoelectronic applications. In this work, we coupled a layer of perovskite quantum dots to dielectric Mie resonators to simultaneously exploit the Purcell effect and increase light extraction, resulting in an 18-fold increase in luminescence. Our numerical simulations and experimental measurements revealed the interplay of these two effects and provided guiding principles for maximizing the output intensity of quantum emitters and classical emitters in perovskite-based optoelectronic devices.
Article
Nanoscience & Nanotechnology
Pengru Huang, Ruslan Lukin, Maxim Faleev, Nikita Kazeev, Abdalaziz Rashid Al-Maeeni, Daria V. Andreeva, Andrey Ustyuzhanin, Alexander Tormasov, A. H. Castro Neto, Kostya S. Novoselov
Summary: Modification of physical properties and design of materials with on-demand characteristics is crucial in modern technology. Machine learning methods are applied to these systems due to the difficulty in modeling designer materials. A new platform is developed for implementing machine learning techniques in materials design, utilizing datasets on pristine and defected materials.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Chemistry, Physical
Xuanye Leng, Ricardo J. Vazquez, Samantha R. McCuskey, Glenn Quek, Yude Su, Konstantin G. Nikolaev, Mariana C. F. Costa, Siyu Chen, Musen Chen, Kou Yang, Jinpei Zhao, Mo Lin, Zhaolong Chen, Guillermo C. Bazan, Kostya S. Novoselov, Daria V. Andreeva
Summary: The high electrical conductivity and low dimensionality of graphene are crucial for lightweight bioanodes in new-generation energy technologies. However, integrating graphene in biointerfaces is challenging due to its incompatible surface energy with living matter. We propose a sustainable chemical control method to achieve the desired surface hydrophilicity and conductivity of graphene nanowalls, enabling the formation of a lightweight, graphene-based, sponge bioanode. This novel graphene-based material shows stable and rapid response, with a biocurrent density of 135.35 mA m(-2) achieved within a few hours.
Article
Biotechnology & Applied Microbiology
Nanxi Shen, Shu Chen, Dong Liu, Xiangde Min, Qinghai Tan
Summary: This study systematically analyzed the classification, prognostic value, and relationship with tumor microenvironment (TME) of cuproptosis-associated genes (CAGs). Four clusters of CAGs were identified, and their associations with clinical features, prognosis, immune cell infiltration, and chemotherapy sensitivity were observed. The cuproptosis score (Cuscore) was found to be an independent prognostic indicator in lower-grade glioma (LrGG) patients. A high Cuscore was associated with worse prognosis, immune infiltration, and increased tumor mutation burden, as well as with immune checkpoint inhibitors, immunotherapy response, and immune phenotype.
JOURNAL OF GENE MEDICINE
(2023)
Article
Materials Science, Multidisciplinary
Qin Qin, Weiqi Cao, DaWa Zhaxi, Xianyong Chen, Daria V. Andreeva, Kefan Chen, Shuai Yang, Hao Tian, Majid Shaker, Zhan Jin, Kostya S. Novoselov
Summary: In this study, composite phase change materials (PCMs) (EG-PCM and SA-PCM) with stable shape were prepared using 1-decanol, expanded graphite (EG), and silica aerogel (SA). The optimal contents of EG and SA in the composite PCMs were determined to be 9% and 14% respectively. The composite PCMs showed good thermal stability even after 220 heating/cooling cycles. The thermal conductivity of EG-PCM and SA-PCM was enhanced to 16.09 times and 1.21 times of the neat PCM, respectively. The composite PCMs effectively maintained the temperature and acidity of yogurt for several hours in a cold chain transport portable box.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Chemical
Musen Chen, Maxim Trubyanov, Pengxiang Zhang, Qian Wang, Zelong Li, Kostya S. Novoselov, Daria Andreeva
Summary: Graphene oxide (GO) based multi-layered membranes have exceptional molecular-sieving properties for gas separation, especially for hydrogen decarbonization. However, the mechanism of gas permeation through two-dimensional GO membranes is very different from traditional polymeric membranes due to their multilayer, laminated nature. Understanding and measuring gas transport parameters, such as diffusivity and solubility, are crucial for the strategic design of novel membranes based on two-dimensional materials.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Qinghai Tan, Abdullah Rasmita, Zhaowei Zhang, Hongbing Cai, Xiangbin Cai, Xuran Dai, Kenji Watanabe, Takashi Taniguchi, Allan H. MacDonald, Weibo Gao
Summary: Using interlayer excitons as a probe, the authors demonstrate that interlayer interactions can be electrically switched on and off in heterobilayers of tungsten diselenide and molybdenum disulfide (WSe2/MoS2), resulting in a layer-dependent correlated phase diagram. They show that these correlated phases affect the decay pathways of interlayer excitons, revealing the role of strong correlation in their dynamics. This study paves the way for studying layer-resolved strong correlation behavior in moire heterostructures.
Article
Multidisciplinary Sciences
Jiaxin Zhao, Antonio Fieramosca, Kevin Dini, Ruiqi Bao, Wei Du, Rui Su, Yuan Luo, Weijie Zhao, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: Monolayer transition-metal dichalcogenide (TMD) materials have unique properties and promising applications in optoelectronic devices. By vertically stacking TMD materials, researchers can control the electronic and optical properties. The integration of TMD heterostructures in planar microcavities is important for controlling light-matter interactions and forming robust polaritons. The authors demonstrate the systematic control of coupling strength by embedding multiple WS2 monolayers in a planar microcavity and observe the presence of long-living dark excitations.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Kunze Lu, Manlin Luo, Weibo Gao, Qi Jie Wang, Hao Sun, Donguk Nam
Summary: Despite the centrosymmetric nature of graphene, strain engineering can be used to manipulate its lattice arrangement and induce sublattice polarization, activating second harmonic generation (SHG). The SHG signal in strained graphene is boosted 50-fold at low temperatures due to resonant transitions between strain-induced pseudo-Landau levels. The second-order susceptibility of strained graphene exceeds that of hexagonal boron nitride with intrinsic broken inversion symmetry, opening up possibilities for high-efficiency nonlinear devices.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Tanjung Krisnanda, Kevin Dini, Huawen Xu, Wouter Verstraelen, Timothy C. H. Liew
Summary: A collective outcome or decision from a crowd is often superior to that of a single expert, according to our study on quantum machine learning. We compare the performance of a highly trained quantum network (expert) with several poorly trained ones (crowd) for tasks like quantum tomography and entanglement recognition. Additionally, we demonstrate enhanced performance from a temporal crowd using time multiplexing on a single poorly trained quantum network. Our findings reveal that, given the same training resources, the crowd outperforms the expert by a definitive margin.
PHYSICAL REVIEW APPLIED
(2023)
Article
Multidisciplinary Sciences
Jinqi Wu, Sanjib Ghosh, Yusong Gan, Ying Shi, Subhaskar Mandal, Handong Sun, Baile Zhang, Timothy C. H. Liew, Rui Su, Qihua Xiong
Summary: Unlike conventional lasers, topological lasers can emit coherent light in the presence of disorders and defects due to their nontrivial band topology. Exciton polariton topological lasers, which have the unique property of not requiring population inversion, are a promising platform for low-power consumption. In this study, we experimentally demonstrate the realization of topological corner states and achieve polariton corner state lasing with a low threshold at room temperature using a perovskite polariton system. This achievement opens up possibilities for on-chip active polaritonics using higher-order topology.
Article
Materials Science, Multidisciplinary
Musen Chen, Qian Wang, Maxim Trubyanov, Kou Yang, Aleksandr S. Aglikov, Ge Qi, Ekaterina V. Skorb, Kostya S. Novoselov, Daria V. Andreeva
Summary: This study demonstrates the feasibility of large-scale self-assembly of graphene oxide flakes into anisotropic films using a simple blade coating technique. They also propose a statistical analysis method utilizing scanning electron microscopy images for the characterization of materials with macroscopic surface morphology. Furthermore, the application of these films as low-dimensional soft actuators is explored, showcasing their outstanding stimuli-responsive performance and self-adaptation to the environment.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Feifei Zhou, Zhengzhi Jiang, Haidong Liang, Shihao Ru, Andrew A. Bettiol, Weibo Gao
Summary: We systematically investigate the laser and microwave power broadening in continuous-wave optically detected magnetic resonance (ODMR) of the V-(B) over bar ensemble in h-BN. The behaviors of ODMR contrast and line width are revealed as a function of the laser and microwave powers. The results provide important suggestions for further applications of V-(B) over bar centers in quantum information processing and ODMR-based quantum sensing.
