Nano Letters最新文献

Antiferrodistortive and Ferroeletric Phase Transitions in Freestanding Films of SrTiO3 SrTiO3独立薄膜中的反铁畸变和铁电相变

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-05-01 DOI: 10.1021/acs.nanolett.4c05664

Ludmila Leroy, Shih-Wen Huang, Chun-Chien Chiu, Sheng-Zhu Ho, Janine Dössegger, Cinthia Piamonteze, Yi-Chun Chen, Elsa Abreu, Alessandro Bombardi, Jan-Chi Yang, Urs Staub

{"title":"Antiferrodistortive and Ferroeletric Phase Transitions in Freestanding Films of SrTiO3","authors":"Ludmila Leroy, Shih-Wen Huang, Chun-Chien Chiu, Sheng-Zhu Ho, Janine Dössegger, Cinthia Piamonteze, Yi-Chun Chen, Elsa Abreu, Alessandro Bombardi, Jan-Chi Yang, Urs Staub","doi":"10.1021/acs.nanolett.4c05664","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c05664","url":null,"abstract":"Thin films’ properties can be greatly influenced by their supporting growth substrates. Even in the so-called strain-free heterostructure films, it is still unclear whether there will be no interfacial electronic reconstructions induced by the underlying substrates. Here, we report the studies of SrTiO3 (STO) films in the freestanding form (FS) with a thickness ranging from 20 to 80 nm. These STO films, by default, are in a strain-free state; they exhibit distinct properties not seen in both bulk and strain-free heterostructure forms. Our films show an enhanced antiferrodistortive (AFD) phase transition temperature with a preferential in-plane rotation axis for the TiO6 octahedra. The anisotropic Ti orbital occupancy around the surface signals the departure of its properties from the bulk. Moreover, we have found that the in-plane ferroelectricity can be strengthened by the reduced dimensionality, establishing that the dimensionality control is an important factor for enhancing STO’s ferroelectric response.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"1 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multistate Polarization and Enhanced Nonreciprocal Transport in Two-Dimensional van der Waals Ferroelectric Heterostructures 二维范德华铁电异质结构中的多态极化和增强非互易输运

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-05-01 DOI: 10.1021/acs.nanolett.5c00398

Erqing Wang, Mingxiang Pan, Yuxiao Chen, Hui Zeng, Wenhui Duan, Huaqing Huang

{"title":"Multistate Polarization and Enhanced Nonreciprocal Transport in Two-Dimensional van der Waals Ferroelectric Heterostructures","authors":"Erqing Wang, Mingxiang Pan, Yuxiao Chen, Hui Zeng, Wenhui Duan, Huaqing Huang","doi":"10.1021/acs.nanolett.5c00398","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00398","url":null,"abstract":"Achieving multiple switchable polarization states at the nanoscale is crucial to high-density nonvolatile multistate memory beyond bistable ferroelectric architectures. Here, we propose a novel strategy to realize multistate polarization and enhance nonreciprocal transport in two-dimensional (2D) van der Waals ferroelectric heterostructures. By integrating two distinct 2D ferroelectric materials with substantial spontaneous polarizations, we demonstrate that the Bi/SnTe heterostructure can support up to eight distinct polarization states. Our first-principles analysis of transforming paths and corresponding energy barriers reveals that these states can be mutually switched by applying external electric fields, facilitated by a combination of intralayer polar distortion and interlayer sliding. Moreover, the Bi/SnTe heterostructure exhibits significantly enhanced nonlinear Hall and kinetic magnetoelectric effects, closely correlated to the multistate in-plane and persistent out-of-plane polarization. These findings open new possibilities for designing advanced ferroelectric devices with multiple polarization states and enhanced nonreciprocal transport, offering a pathway toward next-generation memory and nanoelectronics.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"37 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Clean Interfaces in Twisted Bilayer Graphene via Elastocapillary-Driven Directional Motion of Nanodroplets 利用弹性毛细管驱动的纳米液滴定向运动清洁扭曲双层石墨烯界面

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-05-01 DOI: 10.1021/acs.nanolett.5c01379

Wenlong Dong, Jianing Fan, Yuan Hou, Xuwei Cui, Mengzhen Zhu, Congying Wang, Ling Wang, Qunyang Li, Luqi Liu, Fengchao Wang, Zhong Zhang

{"title":"Clean Interfaces in Twisted Bilayer Graphene via Elastocapillary-Driven Directional Motion of Nanodroplets","authors":"Wenlong Dong, Jianing Fan, Yuan Hou, Xuwei Cui, Mengzhen Zhu, Congying Wang, Ling Wang, Qunyang Li, Luqi Liu, Fengchao Wang, Zhong Zhang","doi":"10.1021/acs.nanolett.5c01379","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01379","url":null,"abstract":"Layered van der Waals (vdW) materials, characterized by an ultrahigh surface-to-volume ratio and weak interlayer interaction, readily encapsulate ambient contaminants, resulting in the formation of nanodroplets. These intercalated nanodroplets disrupt the interlayer coupling, thereby degrading the material’s physical properties. Consequently, achieving an ultraclean vdW interface over a substantial area, particularly in suspended vdW materials, presents a significant challenge. In this study, we propose a novel strategy that utilizes the uniaxial stretching-induced curvature effect to direct the motion of nanodroplets within suspended twisted bilayer graphene (TBLG). This phenomenon is associated with elastocapillarity, a connection further evidenced by observable changes in the droplets’ morphology. These deformed nanodroplets can move directionally in response to the thermally stimulated opening of the vdW interface, eventually leading to an ultraclean interface of TBLG sheets. Our approach not only facilitates mass transport at the atomic channels but also enables the achievement of clean vdW interfaces on a large scale.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"36 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Breaking the Limit of Grain Boundaries in Perovskite Photodetection by High-Pressure Treatment 高压处理钙钛矿光探测中突破晶界限制的研究

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-05-01 DOI: 10.1021/acs.nanolett.5c01543

Yanfeng Yin, Hui Luo, Na Ta, Hongli Xuan, Xujie Lü, Shengye Jin, Wenming Tian

{"title":"Breaking the Limit of Grain Boundaries in Perovskite Photodetection by High-Pressure Treatment","authors":"Yanfeng Yin, Hui Luo, Na Ta, Hongli Xuan, Xujie Lü, Shengye Jin, Wenming Tian","doi":"10.1021/acs.nanolett.5c01543","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01543","url":null,"abstract":"Grain boundaries (GBs) in polycrystalline metal halide perovskite (MHP) films hinder charge transport, limiting the optoelectronic device efficiency. Therefore, optimizing GBs and enhancing intergrain carrier transport is crucial for improving optoelectronic performance, especially in lateral-structure devices such as photoconductors, phototransistors, and photodetectors. Hydrostatic pressure provides a new dimension for tuning the structures and properties of halide perovskites. Here we report permanent structural changes, specifically recrystallization at GBs, and performance improvement of (FAPbI3)0.95(MAPbBr3)0.05 perovskite polycrystalline films by sustaining it under a mild pressure of 1.8 GPa for 12 h. The treated film, after being released to ambient conditions, exhibits a huge enhancement in carrier diffusivity by ∼5 times and photoresponsivity by ∼8 times. These notable enhancements are attributed to improved intergrain carrier transport facilitated by pressure-induced recrystallization at the GBs. These results imply that pressure treatment is a promising method for enhancing the optoelectronic performance of perovskite devices.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"12 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stabilization and Chirality Control of Topological Meron Textures in Radially Graded Ferroelectric Materials 径向梯度铁电材料中拓扑介子织构的稳定性和手性控制

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.5c01035

Le Van Lich, Ha Thi Dang, Dang Thi Hong Hue, Ba-Hieu Vu, Van-Hai Dinh, Trong-Giang Nguyen

{"title":"Stabilization and Chirality Control of Topological Meron Textures in Radially Graded Ferroelectric Materials","authors":"Le Van Lich, Ha Thi Dang, Dang Thi Hong Hue, Ba-Hieu Vu, Van-Hai Dinh, Trong-Giang Nguyen","doi":"10.1021/acs.nanolett.5c01035","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01035","url":null,"abstract":"Polar Meron textures possess unique electric dipole arrangements and electrical responses, offering potential for advanced technologies. While balancing elastic and electrostatic energies has shown promise in creating these textures, achieving precise control remains an ongoing challenge. Here, we introduce a method for inducing a topological Meron texture through electrostatic energy manipulation via a gradient design in material distribution. A phase diagram for polar textures in radially graded ferroelectric thin films is constructed using phase-field modeling. Our results show the stabilization of Meron textures, which geometrically and topologically distinguish from conventional vortex structures. This Meron state is characterized by out-of-plane polarization and toroidal moments, which are tunable with electric fields. A curled electric field can switch the Meron handedness, while homogeneous fields can modify both handedness and chirality. These insights into topological configurations in ferroelectric materials could drive further exploration and innovative applications in next-generation device technologies.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"20 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic Enhancement Effects of Heterogeneous Isomorphism Clusters in Response to Irradiation: Sub-10 nm Nanolithography and Nanoscale Etching Transfer 异质同构团簇在辐照下的协同增强效应：亚10nm纳米光刻和纳米蚀刻转移

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.5c00583

Yang Qiao, Changliang Li, Fengbo Yan, Zhaochao Liu, Xingkun Wang, Jianan Xie, Guangyue Shi, Jian Wei, Jun Zhao, Lei Zhang, Feng Luo

{"title":"Synergistic Enhancement Effects of Heterogeneous Isomorphism Clusters in Response to Irradiation: Sub-10 nm Nanolithography and Nanoscale Etching Transfer","authors":"Yang Qiao, Changliang Li, Fengbo Yan, Zhaochao Liu, Xingkun Wang, Jianan Xie, Guangyue Shi, Jian Wei, Jun Zhao, Lei Zhang, Feng Luo","doi":"10.1021/acs.nanolett.5c00583","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00583","url":null,"abstract":"The advancement of integrated circuit manufacturing has continuously relied on lithography technology as a fundamental driving force. However, the development of photoresists faces a resolution-line edge roughness-sensitivity (RLS) trade-off, hindering simultaneous optimization. To address this issue, we propose a collaborative strategy for heterogeneous isomorphism cluster photoresists with different radiation responses. The Ti4M4-oxo cluster platform [Ti4Zr4O6(OBu)4(OMc)16] (T4Z4), with higher sensitivity, was applied as a photosensitizer for a higher resolution photoresist of [Ti4Hf4O6(OBu)4(OMc)16] (T4H4), allowing the hybrid photoresist to effectively induce cluster cross-linking at low exposure doses, synergistically producing high-resolution patterns. This achieved an e-beam resolution enhancement from 16 to 7.5 nm, with successful fabrication of intricate patterns under 10 nm. The hybrid photoresist also exhibits the capability to etch transfer patterns below 20 nm onto silicon dioxide substrates, highlighting its potential for future device manufacturing. This work presents a new perspective on photoresist design to effectively tackle RLS trade-off limitations.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"26 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reevaluating the Effect of a LiF-Containing Solid Electrolyte Interphase on Lithium Metal Anodes 含锂离子固体电解质界面对锂金属阳极影响的再评价

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.5c00675

Chengkun Liu, Kaixiang Ren, Shilin Wu, Yuhang Zhang, Hai-Wen Li, Meng Yao, Zhipeng Jiang, Yongtao Li

{"title":"Reevaluating the Effect of a LiF-Containing Solid Electrolyte Interphase on Lithium Metal Anodes","authors":"Chengkun Liu, Kaixiang Ren, Shilin Wu, Yuhang Zhang, Hai-Wen Li, Meng Yao, Zhipeng Jiang, Yongtao Li","doi":"10.1021/acs.nanolett.5c00675","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00675","url":null,"abstract":"Developing high-energy-density lithium metal batteries (LMBs) necessitates robust solid electrolyte interphases (SEIs) capable of enduring prolonged cycling. While lithium fluoride (LiF) is recognized as crucial for lithium metal anode (LMA) protection, the effects of different LiF sources in SEIs remain insufficiently understood. In this study, we systematically introduce single fluorine sources─anion LiF, solvent LiF, and native LiF─into a fluoride-free electrolyte system to elucidate the impact of LiF originating from different sources on the SEI composition and properties. Results reveal that SEI performance depends not only on LiF content but also on coexisting organic components. During deep cycling, solvent-derived LiF-rich SEIs, containing elevated LiF and organics, offer superior LMA protection ability. These SEIs maintain structural integrity during significant volume changes, effectively suppressing dead Li formation and achieving enhanced Coulombic efficiency. This work reexamines LiF’s protective mechanisms while advancing SEI chemistry understanding, providing critical insights for developing high-performance LMBs.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"90 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wireless Passive Flexible Radio Frequency Tactile Sensor for Material Recognition 用于材料识别的无线无源柔性射频触觉传感器

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.5c01542

Enkang Wu, Junge Liang, Namyoung Kim, Yongwoo Jang, Eunseong Kim, Mingyang Yan, Jiakang Wu, Cong Wang, Xiaofeng Gu, Yang Li

{"title":"Wireless Passive Flexible Radio Frequency Tactile Sensor for Material Recognition","authors":"Enkang Wu, Junge Liang, Namyoung Kim, Yongwoo Jang, Eunseong Kim, Mingyang Yan, Jiakang Wu, Cong Wang, Xiaofeng Gu, Yang Li","doi":"10.1021/acs.nanolett.5c01542","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c01542","url":null,"abstract":"Developing intelligent tactile systems for perceiving the real world is significant for electronic skin and wearable devices. However, avoiding complex circuitry and achieving lightweight and wireless tactile devices remain challenging. This study presents a biomimetic, ultrasensitive, and multifunctional wireless radio frequency tactile sensor (WiRFTS), which comprises a porous polyaniline–polydimethylsiloxane (PANI–PDMS) sponge, pressure electrodes, and a communication coil. Benefiting from the synergistic effect of the porous microstructure and the high dielectric PANI particles, the WiRFTS exhibits an ultrahigh sensitivity of 1.394 MHz/kPa (<10 kPa), a linear sensitivity of 0.319 MHz/kPa (10–200 kPa), and a high resolution of 0.28%. Especially, the electromagnetic field at the surface of WiRFTS endows it with exceptional spatial perception. A noncontact intelligent material cognition system is established by combining WiRFTS with artificial intelligence algorithms, achieving 100% recognition accuracy for eight materials. Extensive study of RF-based dielectric properties ensures the system surpasses other technologies in material identification diversity.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"1 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature-Responsive Cellulose-Based Janus Hydrogel as Underwater Electronic Skin 温度响应纤维素基Janus水凝胶作为水下电子皮肤

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.5c00985

Haoran Shi, Feng Kuang, Huanxin Huo, Yihong Gao, Xin Duan, Jingjie Shen, Jianyong Wan, Yanmei Li, Guanben Du, Long Yang

{"title":"Temperature-Responsive Cellulose-Based Janus Hydrogel as Underwater Electronic Skin","authors":"Haoran Shi, Feng Kuang, Huanxin Huo, Yihong Gao, Xin Duan, Jingjie Shen, Jianyong Wan, Yanmei Li, Guanben Du, Long Yang","doi":"10.1021/acs.nanolett.5c00985","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00985","url":null,"abstract":"This study develops a Janus-structured hydrogel sensor (P(AA-co-PNIPAM/CDs)) through template-assisted copolymerization of acrylic acid and N-isopropylacrylamide with dopamine-cellulose carbon dots (CDs). The hydrogel demonstrates temperature-responsive strain sensing regulation and enhanced interfacial adhesion, achieving remarkable peel strengths of 237.8 N m–1 (air, 25 °C) and 42.7 N m–1 (water, 50 °C). CD incorporation improves conductivity (1.219 mS cm–1) while reinforcing dynamic adhesion through hydrogen bonding and π–π interactions. The dual-responsive hydrogel exhibits exceptional joint motion monitoring capabilities across diverse environments, maintaining a stable electrical signal output during repetitive stretching (100% strain). Its temperature-modulated underwater adhesion and strain-sensitive conductivity enable the precise detection of both macroscopic movements (joint flexion) and subtle physiological signals (pulse waves). These synergistic properties position P(AA-co-PNIPAM/CDs) as a promising candidate for next-generation smart sensors in athletic monitoring and aquatic robotics, particularly in addressing challenges in underwater wearable electronics and adaptive human–machine interfaces.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"52 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast Dynamics of Rydberg Excitons and Their Optically Induced Charged Complexes in Encapsulated WSe2 Monolayers 封装WSe2单层中Rydberg激子及其光诱导带电配合物的超快动力学

IF 10.8 1区材料科学

Nano Letters Pub Date : 2025-04-30 DOI: 10.1021/acs.nanolett.4c06428

Armando Genco, Chiara Trovatello, Vanik A. Shahnazaryan, Oleg Dogadov, Alisson R. Cadore, Barbara L. T. Rosa, James A. Kerfoot, Tanweer Ahmed, Osman Balci, Evgeny M. Alexeev, Habib Rostami, Kenji Watanabe, Takashi Taniguchi, Seth Ariel Tongay, Andrea C. Ferrari, Giulio Cerullo, Stefano Dal Conte

{"title":"Ultrafast Dynamics of Rydberg Excitons and Their Optically Induced Charged Complexes in Encapsulated WSe2 Monolayers","authors":"Armando Genco, Chiara Trovatello, Vanik A. Shahnazaryan, Oleg Dogadov, Alisson R. Cadore, Barbara L. T. Rosa, James A. Kerfoot, Tanweer Ahmed, Osman Balci, Evgeny M. Alexeev, Habib Rostami, Kenji Watanabe, Takashi Taniguchi, Seth Ariel Tongay, Andrea C. Ferrari, Giulio Cerullo, Stefano Dal Conte","doi":"10.1021/acs.nanolett.4c06428","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06428","url":null,"abstract":"Quantum confinement and reduced dielectric screening lead to strong excitonic effects in atomically thin transition metal dichalcogenides (TMDs). Encapsulation of TMD monolayers in hexagonal boron nitride (hBN) unveils the excitonic Rydberg series below the free particle bandgap. The nonequilibrium response and the dynamics of these higher order exciton states and their multiparticle complexes remain almost unexplored. Here we use ultrafast pump–probe optical microscopy to measure the dynamics of excited-state (2s) excitons in hBN-encapsulated monolayer WSe2. 2s excitons form through an ultrafast relaxation process from high-energy states and exhibit longer decay dynamics than ground state excitons due to their higher spatial extension. We detect light-induced formation of 2s trions with significant oscillator strength and faster decay dynamics than 2s excitons, attributed to an intra-excitonic Auger effect causing an additional decay channel. Our results shed light on the dynamics of excited state excitons in TMDs and their interactions with free carriers.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"114 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0