@article{kim_vetter_yan_yang_wang_sun_yang_comstock_li_zhou_et al._2023, title={Chiral-phonon-activated spin Seebeck effect}, volume={2}, ISSN={["1476-4660"]}, url={http://dx.doi.org/10.1038/s41563-023-01473-9}, DOI={10.1038/s41563-023-01473-9}, abstractNote={Utilization of the interaction between spin and heat currents is the central focus of the field of spin caloritronics. Chiral phonons possessing angular momentum arising from the broken symmetry of a non-magnetic material create the potential for generating spin currents at room temperature in response to a thermal gradient, precluding the need for a ferromagnetic contact. Here we show the observation of spin currents generated by chiral phonons in a two-dimensional layered hybrid organic-inorganic perovskite implanted with chiral cations when subjected to a thermal gradient. The generated spin current shows a strong dependence on the chirality of the film and external magnetic fields, of which the coefficient is orders of magnitude larger than that produced by the reported spin Seebeck effect. Our findings indicate the potential of chiral phonons for spin caloritronic applications and offer a new route towards spin generation in the absence of magnetic materials.}, journal={NATURE MATERIALS}, publisher={Springer Science and Business Media LLC}, author={Kim, Kyunghoon and Vetter, Eric and Yan, Liang and Yang, Cong and Wang, Ziqi and Sun, Rui and Yang, Yu and Comstock, Andrew H. and Li, Xiao and Zhou, Jun and et al.}, year={2023}, month={Feb} }
 @article{cong_vetter_yan_li_zhang_xiong_qu_schaller_hoffmann_kemper_et al._2021, title={Coherent control of asymmetric spintronic terahertz emission from two-dimensional hybrid metal halides}, volume={12}, ISSN={["2041-1723"]}, url={https://doi.org/10.1038/s41467-021-26011-6}, DOI={10.1038/s41467-021-26011-6}, abstractNote={Abstract}, number={1}, journal={NATURE COMMUNICATIONS}, author={Cong, Kankan and Vetter, Eric and Yan, Liang and Li, Yi and Zhang, Qi and Xiong, Yuzan and Qu, Hongwei and Schaller, Richard D. and Hoffmann, Axel and Kemper, Alexander F. and et al.}, year={2021}, month={Sep} }
 @article{zhang_chung_huang_vetter_seyitliyev_sun_gundogdu_castellano_danilov_yang_2020, title={Towards radiation detection using Cs2AgBiBr6 double perovskite single crystals}, volume={269}, ISSN={0167-577X}, url={http://dx.doi.org/10.1016/j.matlet.2020.127667}, DOI={10.1016/j.matlet.2020.127667}, abstractNote={In this work, we studied the optical- and electrical- properties of emerging Cs2AgBiBr6 double perovskite single crystals and demonstrated their potential for detecting ionizing radiation. We prepared Cs2AgBiBr6 double perovskite single crystals from a saturated aqueous solution. Low-temperature photoluminescence (PL) was employed to determine the bandgap energies of Cs2AgBiBr6, which are 2.00 eV (indirect) and 2.26 eV (direct) respectively. Using the space charge limited current method, we estimated the density of trap states and mobility of charge carriers as 1.44 × 1010 cm−3 and 7.02 cm2/V-s respectively. A lower bound value of the mobility-lifetime (μ-τ) product of 2.48 × 10−3 cm2/V was determined using 450 nm laser excitation, which was sufficient for ensuring a long drift distance of charge carriers for several radiation detector applications. Furthermore, we tested the direct response of Cs2AgBiBr6 single crystals to X-ray radiation. Our Cs2AgBiBr6 single crystal device with gold electrodes deposited on the two parallel surfaces exhibited excellent linear response to low energy X-rays.}, journal={Materials Letters}, publisher={Elsevier BV}, author={Zhang, Zheng and Chung, Ching-Chang and Huang, Zhengjie and Vetter, Eric and Seyitliyev, Dovletgeldi and Sun, Dali and Gundogdu, Kenan and Castellano, Felix N. and Danilov, Evgeny O. and Yang, Ge}, year={2020}, month={Jun}, pages={127667} }
 @article{fang_wang_wang_hou_vetter_kou_yang_yin_xiao_li_et al._2020, title={Tuning the interfacial spin-orbit coupling with ferroelectricity}, volume={11}, ISSN={["2041-1723"]}, DOI={10.1038/s41467-020-16401-7}, abstractNote={Abstract}, number={1}, journal={NATURE COMMUNICATIONS}, author={Fang, Mei and Wang, Yanmei and Wang, Hui and Hou, Yusheng and Vetter, Eric and Kou, Yunfang and Yang, Wenting and Yin, Lifeng and Xiao, Zhu and Li, Zhou and et al.}, year={2020}, month={May} }
 @article{sun_yang_yang_kumar_vetter_xue_li_li_li_zhang_et al._2020, title={Visualizing Tailored Spin Phenomena in a Reduced-Dimensional Topological Superlattice}, volume={32}, ISSN={["1521-4095"]}, DOI={10.1002/adma.202005315}, abstractNote={Abstract}, number={49}, journal={ADVANCED MATERIALS}, author={Sun, Rui and Yang, Shijia and Yang, Xu and Kumar, A. and Vetter, Eric and Xue, Wenhua and Li, Yan and Li, Na and Li, Yang and Zhang, Shihao and et al.}, year={2020}, month={Dec} }
 @article{li_li_liu_xie_vetter_yuan_he_liu_sun_xia_et al._2019, title={Isotropic non-local Gilbert damping driven by spin pumping in epitaxial Pd/Fe films on MgO(001) substrates}, volume={21}, ISSN={["1367-2630"]}, url={https://doi.org/10.1088/1367-2630/ab4c8d}, DOI={10.1088/1367-2630/ab4c8d}, abstractNote={Abstract}, number={10}, journal={NEW JOURNAL OF PHYSICS}, publisher={IOP Publishing}, author={Li, Y. and Li, Y. and Liu, Q. and Xie, Z. K. and Vetter, E. and Yuan, Z. and He, W. and Liu, H. L. and Sun, D. L. and Xia, K. and et al.}, year={2019}, month={Oct} }
 @article{sun_yang_yang_vetter_sun_li_su_li_li_gong_et al._2019, title={Large Tunable Spin-to-Charge Conversion Induced by Hybrid Rashba and Dirac Surface States in Topological Insulator Heterostructures}, volume={19}, ISSN={["1530-6992"]}, DOI={10.1021/acs.nanolett.9b01151}, abstractNote={Topological insulators (TIs) have emerged as some of the most efficient spin-to-charge convertors because of their correlated spin-momentum locking at helical Dirac surface states. While endeavors have been made to pursue large "charge-to-spin" conversions in novel TI materials using spin-torque-transfer geometries, the reciprocal process "spin-to-charge" conversion, characterized by the inverse Edelstein effect length (λIEE) in the prototypical TI material (Bi2Se3), remains moderate. Here, we demonstrate that, by incorporating a "second" spin-splitting band, namely, a Rashba interface formed by inserting a bismuth interlayer between the ferromagnet and the Bi2Se3 (i.e., ferromagnet/Bi/Bi2Se3 heterostructure), λIEE shows a pronounced increase (up to 280 pm) compared with that in pure TIs. We found that λIEE alters as a function of bismuth interlayer thickness, suggesting a new degree of freedom to manipulate λIEE by engineering the interplay of Rashba and Dirac surface states. Our finding launches a new route for designing TI- and Rashba-type quantum materials for next-generation spintronic applications.}, number={7}, journal={NANO LETTERS}, author={Sun, Rui and Yang, Shijia and Yang, Xu and Vetter, Eric and Sun, Dali and Li, Na and Su, Lei and Li, Yan and Li, Yang and Gong, Zi-zhao and et al.}, year={2019}, month={Jul}, pages={4420–4426} }
 @article{hany_yang_zhou_sun_gundogdu_seyitliyev_danilov_castellano_sun_vetter_et al._2019, title={Low temperature cathodoluminescence study of Fe-doped β-Ga2O3}, volume={257}, ISSN={0167-577X}, url={http://dx.doi.org/10.1016/j.matlet.2019.126744}, DOI={10.1016/j.matlet.2019.126744}, abstractNote={Optical and electrical properties along the b-axis of Fe-doped β-Ga2O3 were studied using low temperature cathodoluminescence (CL) spectroscopy, optical absorption spectroscopy and current-voltage (IV) measurements. The optical absorption spectroscopy showed an absorption edge without near edge shoulder and the corresponding optical bandgap was calculated to be 4.45 eV using direct band gap treatment. The temperature dependent CL measurements exhibited a strong blue to ultraviolet (UV) band composed of multiple low intensity peaks in the blue range, a main blue peak, a main UV peak, and a weak UV band from the as-grown Fe-doped β-Ga2O3. After a controlled annealing in air, the emissions changed to a red to near infrared (R-NIR) band with two sharp peaks and an UV band that is resolved at room temperature to three UV broad peaks. The R-NIR sharp peaks from the air-annealed sample were ascribed to incorporation of nitrogen during air annealing.}, journal={Materials Letters}, publisher={Elsevier BV}, author={Hany, Ibrahim and Yang, Ge and Zhou, Chuanzhen Elaine and Sun, Cheng and Gundogdu, Kenan and Seyitliyev, Dovletgeldi and Danilov, Evgeny O. and Castellano, Felix N. and Sun, Dali and Vetter, Eric and et al.}, year={2019}, month={Dec}, pages={126744} }
 @article{fang_zhang_zhang_jiang_vetter_lee_xu_sun_shen_2019, title={Nonvolatile Multilevel States in Multiferroic Tunnel Junctions}, volume={12}, ISSN={["2331-7019"]}, DOI={10.1103/PhysRevApplied.12.044049}, abstractNote={Manipulation of tunneling spin-polarized electrons via a ferroelectric interlayer sandwiched between two ferromagnetic electrodes, dubbed Multiferroic Tunnel Junctions (MFTJs), can be achieved not only by the magnetic alignments of two ferromagnets but also by the electric polarization of the ferroelectric interlayer, providing great opportunities for next-generation multi-state memory devices. Here we show that a La0.67Sr0.33MnO3 (LSMO)/PbZr0.2Ti0.8O3(PZT)/Co structured MFTJ device can exhibit multilevel resistance states in the presence of gradually reversed ferroelectric domains via tunneling electro-resistance and tunneling magnetoresistance, respectively. The nonvolatile ferroelectric control in the MFTJ can be attributed to separate contributions arising from two independent ferroelectric channels in the PZT interlayer with opposite polarization. Our study shows the dominant role of "mixed" ferroelectric states on achieving accumulative electrical modulation of multilevel resistance states in MFTJs, paving the way for multifunctional device applications.}, number={4}, journal={PHYSICAL REVIEW APPLIED}, author={Fang, Mei and Zhang, Sangjian and Zhang, Wenchao and Jiang, Lu and Vetter, Eric and Lee, Ho Nyung and Xu, Xiaoshan and Sun, Dali and Shen, Jian}, year={2019}, month={Oct} }