Yan-Kai Tzeng

All Publications

• Cesium-mediated electron redistribution and electron-electron interaction in high-pressure metallic CsPbI3. Nature communications Ke, F., Yan, J., Niu, S., Wen, J., Yin, K., Yang, H., Wolf, N. R., Tzeng, Y., Karunadasa, H. I., Lee, Y. S., Mao, W. L., Lin, Y. 2022; 13 (1): 7067

  Abstract

  Electron-phonon coupling was believed to govern the carrier transport in halide perovskites and related phases. Here we demonstrate that electron-electron interaction enhanced by Cs-involved electron redistribution plays a direct and prominent role in the low-temperature electrical transport of compressed CsPbI3 and renders Fermi liquid (FL)-like behavior. By compressing delta-CsPbI3 to 80GPa, an insulator-semimetal-metal transition occurs, concomitant with the completion of a slow structural transition from the one-dimensional Pnma (delta) phase to a three-dimensional Pmn21 (epsilon) phase. Deviation from FL behavior is observed upon CsPbI3 entering the metallic epsilon phase, which progressively evolves into a FL-like state at 186GPa. First-principles density functional theory calculations reveal that the enhanced electron-electron coupling results from the sudden increase of the 5d state occupation in Cs and I atoms. Our study presents a promising strategy of cationic manipulation for tuning the electronic structure and carrier scattering of halide perovskites at high pressure.

  View details for DOI 10.1038/s41467-022-34786-5

  View details for PubMedID 36400789

• Atmospheric-Pressure Flame Vapor Deposition of Nanocrystalline Diamonds: Implications for Scalable and Cost-Effective Coatings ACS APPLIED NANO MATERIALS Manjarrez, A., Zhou, K., Chen, C., Tzeng, Y., Cai, L. 2022

  View details for DOI 10.1021/acsanm.2c02059

  View details for Web of Science ID 000885759500001

• Synthesis of Atomically Thin Hexagonal Diamond with Compression. Nano letters Ke, F., Zhang, L., Chen, Y., Yin, K., Wang, C., Tzeng, Y., Lin, Y., Dong, H., Liu, Z., Tse, J. S., Mao, W. L., Wu, J., Chen, B. 2020

  Abstract

  Atomically thin diamond, also called diamane, is a two-dimensional carbon allotrope and has attracted considerable scientific interest because of its potential physical properties. However, the successful synthesis of a pristine diamane has up until now not been achieved. We demonstrate the realization of a pristine diamane through diamondization of mechanically exfoliated few-layer graphene via compression. Resistance, optical absorption, and X-ray diffraction measurements reveal that hexagonal diamane (h-diamane) with a bandgap of 2.8 ± 0.3 eV forms by compressing trilayer and thicker graphene to above 20 GPa at room temperature and can be preserved upon decompression to 1.0 GPa. Theoretical calculations indicate that a (-2110)-oriented h-diamane is energetically stable and has a lower enthalpy than its few-layer graphene precursor above the transition pressure. Compared to gapless graphene, semiconducting h-diamane offers exciting possibilities for carbon-based electronic devices.

  View details for DOI 10.1021/acs.nanolett.0c01872

  View details for PubMedID 32578991

• Tapered ultra-high numerical aperture optical fiber tip for nitrogen vacancy ensembles based endoscope in a fluidic environment APPLIED PHYSICS LETTERS Duan, D., Kavatamane, V., Arumugam, S., Tzeng, Y., Chang, H., Balasubramanian, G. 2020; 116 (11)

  View details for DOI 10.1063/1.5140785

  View details for Web of Science ID 000521259000001

• Synergistic enhancement of electrocatalytic CO2 reduction to C2 oxygenates at nitrogen-doped nanodiamonds/Cu interface. Nature nanotechnology Wang, H., Tzeng, Y., Ji, Y., Li, Y., Li, J., Zheng, X., Yang, A., Liu, Y., Gong, Y., Cai, L., Li, Y., Zhang, X., Chen, W., Liu, B., Lu, H., Melosh, N. A., Shen, Z., Chan, K., Tan, T., Chu, S., Cui, Y. 2020

  Abstract

  To date, effective control over the electrochemical reduction of CO2 to multicarbon products (C≥2) has been very challenging. Here, we report a design principle for the creation of a selective yet robust catalytic interface for heterogeneous electrocatalysts in the reduction of CO2 to C2 oxygenates, demonstrated by rational tuning of an assembly of nitrogen-doped nanodiamonds and copper nanoparticles. The catalyst exhibits a Faradaic efficiency of ~63% towards C2 oxygenates at applied potentials of only -0.5V versus reversible hydrogen electrode. Moreover, this catalyst shows an unprecedented persistent catalytic performance up to 120h, with steady current and only 19% activity decay. Density functional theory calculations show that CO binding is strengthened at the copper/nanodiamond interface, suppressing CO desorption and promoting C2 production by lowering the apparent barrier for CO dimerization. The inherent compositional and electronic tunability of the catalyst assembly offers an unrivalled degree of control over the catalytic interface, and thereby the reaction energetics and kinetics.

  View details for DOI 10.1038/s41565-019-0603-y

  View details for PubMedID 31907442

• Nanodiamond Integration with Photonic Devices LASER & PHOTONICS REVIEWS Rodulaski, M., Zhang, J., Tzeng, Y., Lagoudakis, K. G., Ishiwata, H., Dory, C., Fischer, K. A., Kelaita, Y. A., Sun, S., Maurer, P. C., Alassaad, K., Ferro, G., Shen, Z., Melosh, N. A., Chu, S., Vuckovic, J. 2019

  View details for DOI 10.1002/lpor.201800316

  View details for Web of Science ID 000480009200001

• Laser-induced heating in a high-density ensemble of nitrogen-vacancy centers in diamond and its effects on quantum sensing OPTICS LETTERS Duan, D., Kavatamane, V., Arumugam, S., Rahane, G., Du, G., Tzeng, Y., Chang, H., Balasubramanian, G. 2019; 44 (11): 2851–54

  View details for DOI 10.1364/OL.44.002851

  View details for Web of Science ID 000469838100061

• Frequency Tunable Single-Photon Emission From a Single Atomic Defect in a Solid Sun, S., Zhang, J., Fischer, K. A., Burek, M. J., Dory, C., Lagoudakis, K. G., Tzeng, Y., Radulaski, M., Kelaita, Y., Safavi-Naeini, A., Shen, Z., Melosh, N. A., Chu, S., Loncar, M., Vuckovic, J., IEEE IEEE. 2019

  View details for Web of Science ID 000482226303114

• Cavity-Enhanced Raman Emission from a Single Color Center in a Solid. Physical review letters Sun, S., Zhang, J. L., Fischer, K. A., Burek, M. J., Dory, C., Lagoudakis, K. G., Tzeng, Y., Radulaski, M., Kelaita, Y., Safavi-Naeini, A., Shen, Z., Melosh, N. A., Chu, S., Loncar, M., Vuckovic, J. 2018; 121 (8): 083601

  Abstract

  We demonstrate cavity-enhanced Raman emission from a single atomic defect in a solid. Our platform is a single silicon-vacancy center in diamond coupled with a monolithic diamond photonic crystal cavity. The cavity enables an unprecedented frequency tuning range of the Raman emission (100GHz) that significantly exceeds the spectral inhomogeneity of silicon-vacancy centers in diamond nanostructures. We also show that the cavity selectively suppresses the phonon-induced spontaneous emission that degrades the efficiency of Raman photon generation. Our results pave the way towards photon-mediated many-body interactions between solid-state quantum emitters in a nanophotonic platform.

  View details for PubMedID 30192607

• Cavity-Enhanced Raman Emission from a Single Color Center in a Solid PHYSICAL REVIEW LETTERS Sun, S., Zhang, J., Fischer, K. A., Burek, M. J., Dory, C., Lagoudakis, K. G., Tzeng, Y., Radulaski, M., Kelaita, Y., Safavi-Naeini, A., Shen, Z., Melosh, N. A., Chu, S., Loncar, M., Vuckovic, J. 2018; 121 (8)

  View details for DOI 10.1103/PhysRevLett.121.083601

  View details for Web of Science ID 000442348000005

• An Ultrastrong Double-Layer Nanodiamond Interface for Stable Lithium Metal Anodes JOULE Liu, Y., Tzeng, Y., Lin, D., Pei, A., Lu, H., Melosh, N. A., Shen, Z., Chu, S., Cui, Y. 2018; 2 (8): 1595–1609

  View details for DOI 10.1016/j.joule.2018.05.007

  View details for Web of Science ID 000441627400022

• Enhancing fluorescence excitation and collection from the nitrogen-vacancy center in diamond through a micro-concave mirror APPLIED PHYSICS LETTERS Duan, D., Kavatamane, V., Arumugam, S., Rahane, G., Tzeng, Y., Chang, H., Sumiya, H., Onoda, S., Isoya, J., Balasubramanian, G. 2018; 113 (4)

  View details for DOI 10.1063/1.5037807

  View details for Web of Science ID 000440046600007

• Strongly Cavity-Enhanced Spontaneous Emission from Silicon-Vacancy Centers in Diamond NANO LETTERS Zhang, J., Sun, S., Burek, M. J., Dory, C., Tzeng, Y., Fischer, K. A., Kelaita, Y., Lardakis, K. G., Radulaski, M., Shen, Z., Melosh, N. A., Chu, S., Loncar, M., Vuckovic, J. 2018; 18 (2): 1360–65

  Abstract

  Quantum emitters are an integral component for a broad range of quantum technologies, including quantum communication, quantum repeaters, and linear optical quantum computation. Solid-state color centers are promising candidates for scalable quantum optics due to their long coherence time and small inhomogeneous broadening. However, once excited, color centers often decay through phonon-assisted processes, limiting the efficiency of single-photon generation and photon-mediated entanglement generation. Herein, we demonstrate strong enhancement of spontaneous emission rate of a single silicon-vacancy center in diamond embedded within a monolithic optical cavity, reaching a regime in which the excited-state lifetime is dominated by spontaneous emission into the cavity mode. We observe 10-fold lifetime reduction and 42-fold enhancement in emission intensity when the cavity is tuned into resonance with the optical transition of a single silicon-vacancy center, corresponding to 90% of the excited-state energy decay occurring through spontaneous emission into the cavity mode. We also demonstrate the largest coupling strength (g/2π = 4.9 ± 0.3 GHz) and cooperativity (C = 1.4) to date for color-center-based cavity quantum electrodynamics systems, bringing the system closer to the strong coupling regime.

  View details for DOI 10.1021/acs.nanolett.7b05075

  View details for Web of Science ID 000425559700102

  View details for PubMedID 29377701

• Optimized photonics: from on-chip nonclassical light sources to circuits Vuckovic, J., Fischer, K., Mueller, K., Zhang, J., Sun, S., Dory, C., Trivedi, R., Lukin, D., Radulaski, M., Rugar, A., Hanschke, L., Finley, J., Burek, M., Loncar, M., Sarmiento, T., Tzeng, Y., Shen, Z., Melosh, N., Chu, S., IEEE IEEE. 2018

  View details for Web of Science ID 000526031003464

• Diamond Color Center Integration with a Silicon Carbide Photonics Platform Radulaski, M., Tzeng, Y., Zhang, J., Ishiwata, H., Lagoudakis, K. G., Dory, C., Fischer, K. A., Kelaita, Y. A., Sun, S., Maurer, P. C., Alassaad, K., Ferro, G., Shen, Z., Melosh, N. A., Chu, S., Vuckovic, J., IEEE IEEE. 2018

  View details for Web of Science ID 000526031001352

• Strong Cavity Enhancement of Spontaneous Emission from Silicon-Vacancy Centers in Diamond Zhang, J., Sun, S., Burek, M. J., Dory, C., Tzeng, Y., Fischer, K. A., Kelaita, Y., Lagoudakis, K. G., Radulaski, M., Shen, Z., Melosh, N. A., Chu, S., Loncar, M., Vuckovic, J., IEEE IEEE. 2018

  View details for Web of Science ID 000526031001068

• Vertical-Substrate MPCVD Epitaxial Nanodiamond Growth. Nano letters Tzeng, Y., Zhang, J. L., Lu, H., Ishiwata, H., Dahl, J., Carlson, R. M., Yan, H., Schreiner, P. R., Vuckovic, J., Shen, Z., Melosh, N., Chu, S. 2017

  Abstract

  Color center-containing nanodiamonds have many applications in quantum technologies and biology. Diamondoids, molecular-sized diamonds have been used as seeds in chemical vapor deposition (CVD) growth. However, optimizing growth conditions to produce high crystal quality nanodiamonds with color centers requires varying growth conditions that often leads to ad-hoc and time-consuming, one-at-a-time testing of reaction conditions. In order to rapidly explore parameter space, we developed a microwave plasma CVD technique using a vertical, rather than horizontally oriented stage-substrate geometry. With this configuration, temperature, plasma density, and atomic hydrogen density vary continuously along the vertical axis of the substrate. This variation allowed rapid identification of growth parameters that yield single crystal diamonds down to 10 nm in size and 75 nm diameter optically active center silicon-vacancy (Si-V) nanoparticles. Furthermore, this method may provide a means of incorporating a wide variety of dopants in nanodiamonds without ion irradiation damage.

  View details for DOI 10.1021/acs.nanolett.6b04543

  View details for PubMedID 28182433

• Complete Coherent Control of Silicon-Vacancies in Diamond Nanopillars Containing Single Defect Centers Zhang, J., Lagoudakis, K. G., Tzeng, Y., Dory, C., Radulaski, M., Kelaita, Y., Fischer, K. A., Shen, Z., Melosh, N. A., Chu, S., Vuckovic, J., IEEE IEEE. 2017

  View details for Web of Science ID 000427296200411

• Complete coherent control of silicon vacancies in diamond nanopillars containing single defect centers OPTICA Zhang, J. L., Lagoudakis, K. G., Tzeng, Y., Dory, C., Radulaski, M., Kelaita, Y., Fischer, K. A., Sun, S., Shen, Z., Melosh, N., Chu, S., Vuckovic, J. 2017; 4 (11): 1317-1321

  View details for DOI 10.1364/OPTICA.4.001317

• Emitter-Cavity Coupling in Hybrid Silicon Carbide-Nanodiamond Microdisk Resonators Radulaski, M., Tzeng, Y., Zhang, J., Ishiwata, H., Lagoudakis, K. G., Souliere, V., Ferro, G., Shen, Z., Melosh, N. A., Chu, S., Vuckovic, J., IEEE IEEE. 2016

  View details for Web of Science ID 000391286402328