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Your search keyword '"Xu, Xiaodong"' showing total 810 results
Start Over Author "Xu, Xiaodong" Publication Year Range Last 3 years Publication Type Academic Journals Publication Type Periodicals
810 results on '"Xu, Xiaodong"'

3. Reversible non-volatile electronic switching in a near-room-temperature van der Waals ferromagnet

Author

Wu, Han, Chen, Lei, Malinowski, Paul, Jang, Bo Gyu, Deng, Qinwen, Scott, Kirsty, Huang, Jianwei, Ruff, Jacob PC, He, Yu, Chen, Xiang, Hu, Chaowei, Yue, Ziqin, Oh, Ji Seop, Teng, Xiaokun, Guo, Yucheng, Klemm, Mason, Shi, Chuqiao, Shi, Yue, Setty, Chandan, Werner, Tyler, Hashimoto, Makoto, Lu, Donghui, Yilmaz, Turgut, Vescovo, Elio, Mo, Sung-Kwan, Fedorov, Alexei, Denlinger, Jonathan D, Xie, Yaofeng, Gao, Bin, Kono, Junichiro, Dai, Pengcheng, Han, Yimo, Xu, Xiaodong, Birgeneau, Robert J, Zhu, Jian-Xin, da Silva Neto, Eduardo H, Wu, Liang, Chu, Jiun-Haw, Si, Qimiao, and Yi, Ming

Subjects
Physical Sciences, Condensed Matter Physics
Abstract

Non-volatile phase-change memory devices utilize local heating to toggle between crystalline and amorphous states with distinct electrical properties. Expanding on this kind of switching to two topologically distinct phases requires controlled non-volatile switching between two crystalline phases with distinct symmetries. Here, we report the observation of reversible and non-volatile switching between two stable and closely related crystal structures, with remarkably distinct electronic structures, in the near-room-temperature van der Waals ferromagnet Fe5-δGeTe2. We show that the switching is enabled by the ordering and disordering of Fe site vacancies that results in distinct crystalline symmetries of the two phases, which can be controlled by a thermal annealing and quenching method. The two phases are distinguished by the presence of topological nodal lines due to the preserved global inversion symmetry in the site-disordered phase, flat bands resulting from quantum destructive interference on a bipartite lattice, and broken inversion symmetry in the site-ordered phase.

Published
2024

8. Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures

Author

Zhang, Shuai, Liu, Yang, Sun, Zhiyuan, Chen, Xinzhong, Li, Baichang, Moore, SL, Liu, Song, Wang, Zhiying, Rossi, SE, Jing, Ran, Fonseca, Jordan, Yang, Birui, Shao, Yinming, Huang, Chun-Ying, Handa, Taketo, Xiong, Lin, Fu, Matthew, Pan, Tsai-Chun, Halbertal, Dorri, Xu, Xinyi, Zheng, Wenjun, Schuck, PJ, Pasupathy, AN, Dean, CR, Zhu, Xiaoyang, Cobden, David H, Xu, Xiaodong, Liu, Mengkun, Fogler, MM, Hone, James C, and Basov, DN

Subjects
Physical Sciences, Condensed Matter Physics
Abstract

Ferroelectricity, a spontaneous and reversible electric polarization, is found in certain classes of van der Waals (vdW) materials. The discovery of ferroelectricity in twisted vdW layers provides new opportunities to engineer spatially dependent electric and optical properties associated with the configuration of moiré superlattice domains and the network of domain walls. Here, we employ near-field infrared nano-imaging and nano-photocurrent measurements to study ferroelectricity in minimally twisted WSe2. The ferroelectric domains are visualized through the imaging of the plasmonic response in a graphene monolayer adjacent to the moiré WSe2 bilayers. Specifically, we find that the ferroelectric polarization in moiré domains is imprinted on the plasmonic response of the graphene. Complementary nano-photocurrent measurements demonstrate that the optoelectronic properties of graphene are also modulated by the proximal ferroelectric domains. Our approach represents an alternative strategy for studying moiré ferroelectricity at native length scales and opens promising prospects for (opto)electronic devices.

Published
2023

9. Evaluating energy retrofits of historic buildings in a university campus using an urban building energy model that considers uncertainties

Author

Lin, Ziqi, Hong, Tianzhen, Xu, Xiaodong, Chen, Jiayu, and Wang, Wei

Subjects
Affordable and Clean Energy, Urban building energy model, Uncertainties, Energy retrofit, Model calibration, University campus, Environmental Science and Management, Urban and Regional Planning
Abstract

Urban building energy model (UBEM) is a powerful tool to simulate performance and evaluate efficiency of upgrades for a group of buildings under the urban context. However, the larger the scale/number of buildings, more parameters must be collected to create energy models that cover each individual building, causing more uncertainties. To reveal this, this study created a UBEM for the mixed modern and historic buildings at a campus in China. The calibrated set of UBEMs with the modeled results meeting the 20% error range, were then used to evaluate uncertainties of energy-savings of four building energy retrofit (BER) measures. The first measure, BER 1, was to preserve the historic values of buildings; BER 2 to meet green building design standard; BER 3 to achieve 20% more savings than BER 2; and BER 4 to utilize renewable photovoltaic energy. For BER 1, BER 2, and BER 3, the energy savings of buildings of different ages varied within 10%–44%. For BER 4, the energy savings of buildings varied within 49%–505%, respectively, where the reason for higher than 100% is energy production is much higher than energy demand. Similar results can be concluded for building functions, for BER 1, BER 2, and BER 3, the energy-saving potentials varied within 6%– 45%, while 97%–492% to BER 4. This study can provide an important and significant reference to apply UBEM in evaluating energy-efficient retrofits as well as other energy-related studies that consider uncertainties.

Published
2023

11. Multi-millijoule class, high repetition rate, Yb:CALYO regenerative amplifier with sub-130 fs pulses.

Author

Petrov, Lyuben S, Georgiev, Kaloyan, Velkov, Dimitar, Trifonov, Anton, Xu, Xiaodong, Popmintchev, Tenio, and Buchvarov, Ivan

Subjects
Affordable and Clean Energy, Optical Physics, Electrical and Electronic Engineering, Communications Technologies, Optics
Abstract

We demonstrate a high-energy, 1 kilohertz, Yb-based, femtosecond regenerative amplifier in a chirped pulse amplification (CPA) architecture by using a single disordered Yb:CALYO crystal, providing 125 fs pulses of 2.3 mJ energy per pulse at a central wavelength of 1039 nm. The amplified compressed pulses, with a spectral bandwidth of 13.6 nm, represent the shortest ultrafast pulse duration reported to date for any multi-millijoule class,Yb-crystalline classical CPA system without additional spectral broadening techniques. We have demonstrated an increase in the gain bandwidth proportionally to the ratio of the excited to total Yb3+ ion densities. A net wider spectrum of the amplified pulses is the result of the interplay between the increased gain bandwidth and the gain narrowing. Finally, our broadest amplified spectrum of 16.6 nm, corresponding to a 96 fs transform limited pulse, can be expanded further to support sub-100 fs pulse durations and 1-10 mJ energies at 1 kHz.

Published
2023

13. Phase-resolved terahertz nanoimaging of WTe2 microcrystals

Author

Jing, Ran, Vitalone, Rocco A, Xu, Suheng, Lo, Chiu Fan Bowen, Fei, Zaiyao, Runburg, Elliott, Shao, Yinming, Chen, Xinzhong, Mooshammer, Fabian, Mcleod, Alexander S, Liu, Mengkun, Fogler, Michael M, Cobden, David H, Xu, Xiaodong, and Basov, DN

Subjects
Quantum Physics, Physical Sciences, Chemical sciences, Engineering, Physical sciences
Published
2023

15. A hydrogen sensor based on an acoustic topological material with a coiled structure.

Author

Liu, Zheng, Zhang, Ruoyan, Duan, Zhendong, Fan, Li, Zhang, Shuyi, Cheng, Liping, and Xu, Xiaodong

Subjects
HYDROGEN detectors, ACOUSTICAL materials, PHONONIC crystals, GAS detectors, CHEMICAL processes
Abstract

A hydrogen sensor is created on the basis of an acoustic topological material with a coiled structure. Compared to traditional hydrogen sensors, the sensor does not possess a sensitive layer and works with the shift of a topological interface state induced by hydrogen. The sensor is composed of two phononic crystals with distinct topological characteristics, and an interface state is achieved at the interface of both phononic crystals. When hydrogen is introduced into the sensor, the density and the sound velocity of the gas in the sensor change, which shifts the frequency of the interface state. Thus, the concentration of hydrogen can be obtained by measuring the frequency shift of the interface state. Due to the absence of a sensitive layer, the sensor operates without a chemical sorption process, and the performance of the sensor is marginally influenced by working conditions, temperature, and humidity. Theoretical analysis, numerical simulations, and experimental results show that in different background gases, synthetic air, nitrogen, and argon, the sensor exhibits relative sensitivities of 0.50, 0.50, and 0.37, which do not change with the working conditions. Additionally, the sensor possesses a rapid response, a good linearity and robustness, and a long lifespan. Furthermore, the sensor is designed based on a coiled structure, which considerably improves the space utilization and decreases the bulk. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Observation of fractionally quantized anomalous Hall effect

Author

Park, Heonjoon, Cai, Jiaqi, Anderson, Eric, Zhang, Yinong, Zhu, Jiayi, Liu, Xiaoyu, Wang, Chong, Holtzmann, William, Hu, Chaowei, Liu, Zhaoyu, Taniguchi, Takashi, Watanabe, Kenji, Chu, Jiun-Haw, Cao, Ting, Fu, Liang, Yao, Wang, Chang, Cui-Zu, Cobden, David, Xiao, Di, and Xu, Xiaodong

Published
2023
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21. Hyperbolic exciton polaritons in a van der Waals magnet

Author

Ruta, Francesco L., Zhang, Shuai, Shao, Yinming, Moore, Samuel L., Acharya, Swagata, Sun, Zhiyuan, Qiu, Siyuan, Geurs, Johannes, Kim, Brian S. Y., Fu, Matthew, Chica, Daniel G., Pashov, Dimitar, Xu, Xiaodong, Xiao, Di, Delor, Milan, Zhu, X-Y., Millis, Andrew J., Roy, Xavier, Hone, James C., Dean, Cory R., Katsnelson, Mikhail I., van Schilfgaarde, Mark, and Basov, D. N.

Published
2023
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44. Spin-mediated shear oscillators in a van der Waals antiferromagnet

Author

Zong, Alfred, Zhang, Qi, Zhou, Faran, Su, Yifan, Hwangbo, Kyle, Shen, Xiaozhe, Jiang, Qianni, Liu, Haihua, Gage, Thomas E., Walko, Donald A., Kozina, Michael E., Luo, Duan, Reid, Alexander H., Yang, Jie, Park, Suji, Lapidus, Saul H., Chu, Jiun-Haw, Arslan, Ilke, Wang, Xijie, Xiao, Di, Xu, Xiaodong, Gedik, Nuh, and Wen, Haidan

Published
2023
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46. Ambipolar charge-transfer graphene plasmonic cavities

Author

Kim, Brian S. Y., Sternbach, Aaron J., Choi, Min Sup, Sun, Zhiyuan, Ruta, Francesco L., Shao, Yinming, McLeod, Alexander S., Xiong, Lin, Dong, Yinan, Chung, Ted S., Rajendran, Anjaly, Liu, Song, Nipane, Ankur, Chae, Sang Hoon, Zangiabadi, Amirali, Xu, Xiaodong, Millis, Andrew J., Schuck, P. James, Dean, Cory. R., Hone, James C., and Basov, D. N.

Published
2023
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48. Continuously tunable uniaxial strain control of van der Waals heterostructure devices.

Author

Liu, Zhaoyu, Ma, Xuetao, Cenker, John, Cai, Jiaqi, Fei, Zaiyao, Malinowski, Paul, Mutch, Joshua, Zhao, Yuzhou, Hwangbo, Kyle, Lin, Zhong, Manna, Arnab, Yang, Jihui, Cobden, David, Xu, Xiaodong, Yankowitz, Matthew, and Chu, Jiun-Haw

Subjects
SILICON wafers, OPTICAL spectroscopy, OPTICAL limiting, SILICA, HETEROSTRUCTURES
Abstract

Uniaxial strain has been widely used as a powerful tool for investigating and controlling the properties of quantum materials. However, existing strain techniques have so far mostly been limited to use with bulk crystals. Although recent progress has been made in extending the application of strain to two-dimensional van der Waals (vdW) heterostructures, these techniques have been limited to optical characterization and extremely simple electrical device geometries. Here, we report a piezoelectric-based in situ uniaxial strain technique enabling simultaneous electrical transport and optical spectroscopy characterization of dual-gated vdW heterostructure devices. Critically, our technique remains compatible with vdW heterostructure devices of arbitrary complexity fabricated on conventional silicon/silicon dioxide wafer substrates. We demonstrate a large and continuously tunable strain of up to − 0.15% at millikelvin temperatures, with larger strain values also likely achievable. We quantify the strain transmission from the silicon wafer to the vdW heterostructure, and further demonstrate the ability of strain to modify the electronic properties of twisted bilayer graphene. Our technique provides a highly versatile new method for exploring the effect of uniaxial strain on both the electrical and optical properties of vdW heterostructures and can be easily extended to include additional characterization techniques. [ABSTRACT FROM AUTHOR]

Published
2024
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