Publications

Boehm, A.M., Doiron, C.F., Sinclair, M.B., Brener, I., Sarma, R., & Ohta, T. (2024). Near-field imaging of optical resonances in silicon metasurfaces using photoelectron microscopy. APL Photonics, 9(6). 10.1063/5.0193683

Ohta, T., Boehm, A.M., Doiron, C.F., Gennaro, S., Kim, A.R., Sinclair, M.B., Beechem, T., Brener, I., & Sarma, R. (2023). Near-field Imaging of Optical Resonance Modes in Silicon Metasurfaces Using Photoelectron Microscopy [Conference Presentation]. 10.2172/2430393

Boehm, A.M., Ohta, T., Kim, A.R., Jarzembski, A., Smyth, C.M., Sugar, J.D., Bartelt, N.C., Leonard, F., Fonseca, J.J., Robinson, J.T., & Lu, T.M. (2023). Engineering of Two-Dimensional Transition Metal Dichalcogenide Interfaces [Conference Presentation]. https://doi.org/10.2172/2430602

Boehm, A.M., Ohta, T., Kim, A.R., Jarzembski, A., Sugar, J.D., Fonseca, J.J., & Robinson, J.T. (2023). Engineering of Two-Dimensional Transition Metal Dichalcogenide Interfaces [Conference Presentation]. 10.2172/2430673

Boehm, A.M., Doiron, C.F., Brener, I., Sarma, R., & Ohta, T. (2023). Near‐field Imaging of Optical Resonance Modes in Silicon Metasurfaces Using Photoelectron Microscopy [Conference Presentation]. 10.2172/2431276

Boehm, A.M., Fonseca, J.J., Thurmer, K., Sugar, J.D., Spataru, C.D., Robinson, J.T., & Ohta, T. (2023). Engineering of Nanoscale Heterogeneous Transition Metal Dichalcogenide-Au Interfaces. Nano Letters, 23(7), pp. 2792-2799. 10.1021/acs.nanolett.3c00080

Doiron, C.F., Brener, I., Sarma, R., Ohta, T., & Boehm, A.M. (2023). Near‐field Imaging of Optical Resonance Modes in Silicon Metasurfaces Using Photoelectron Microscopy [Conference Presentation]. 10.2172/2431519

Ohta, T. (2023). Interaction mechanism of transition metal phthalocyanines on transition metal nitride supports. Applied Surface Science, 614. 10.1016/j.apsusc.2022.156204

Boehm, A.M., Ohta, T., Thuermer, K., Sugar, J.D., Spataru, C.D., Foulk, J.W., & Robinson, J.T. (2022). Engineering of Nanoscale Heterogenous Transition Metal Dichalcogenide-Au Interfaces [Conference Presentation]. 10.2172/2005950

Boehm, A.M., Fonseca, J., Thurmer, K., Sugar, J.D., Spataru, C.D., Robinson, J., & Ohta, T. (2022). Engineering of Nanoscale Heterogenous Transition Metal Dichalcogenide-Au Interfaces [Conference Presentation]. 10.2172/2005871

Moore, C.H., Bussmann, E., Berg, M., Ohta, T., & Hopkins, M.M. (2022). Exploring Dependencies of Work Function on Topography and the Application to Micron-scale Field Emission Model for PIC-DSMC Simulations [Conference Presentation]. 10.2172/2004806

Boehm, A.M., Berg, M., Thomas, C., Smith, S., Spataru, C.D., Thurmer, K., Sugar, J.D., Ohta, T., Fonseca, J.J., Robinson, J.T., Liu, F., Chan, C.K., Mohite, A.D., & Beechem, T.E. (2022). Imaging atomically thin transition metal dichalcogenides using deep ultraviolet photoelectron emission microscopy [Conference Presentation]. 10.2172/2004199

Boehm, A.M., Ohta, T., Thurmer, K., Sugar, J.D., Fonseca, J.J., & Robinson, J.T. (2022). Engineering of Nanoscale Heterogenous Transition Metal Dichalcogenide-Au Interfaces [Conference Presentation]. 10.2172/2003058

Ohta, T., Boehm, A.M., Spataru, C.D., Thurmer, K., Sugar, J.D., Thomas, C.J., Fonseca, J.J., & Robinson, J.T. (2022). Electronic Structure, Stacking Arrangement, and the Interaction Strength of Tungsten Disulfide at the Gold Contact [Conference Presentation]. 10.2172/2003139

Bussmann, E., Smith, S.W., Scrymgeour, D., Brumbach, M.T., Lu, P., Dickens, S.M., Michael, J.R., Ohta, T., Hjalmarson, H.P., Schultz, P.A., Clem, P., Hopkins, M.M., & Moore, C. (2022). Atomic step disorder on polycrystalline surfaces leads to spatially inhomogeneous work functions. Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, 40(2). https://doi.org/10.1116/6.0001729

Kazanowska, B.A., Sapkota, K.R., Lu, P., Talin, A.A., Bussmann, E., Ohta, T., Gunning, B.P., Jones, K.S., & Wang, G.T. (2022). Fabrication and field emission properties of vertical, tapered GaN nanowires etched via phosphoric acid. Nanotechnology, 33(3). 10.1088/1361-6528/ac2981

Rice, A., Tait, C., Lee, S.R., Deitz, J.I., Rodriguez, M.A., Pan, W., Ohta, T., Alliman, D., Peake, G., Sandoval, A., Valdez, N.R., & Sharps, P. (2021). Heteroepitaxy of Dirac semimetal Cd3As2 by MOCVD [Conference Presentation]. 10.2172/1906634

Ohta, T., Thomas, C.J., Spataru, C.D., Fonseca, J.J., & Robinson, J.T. (2021). Electronic Structure and Stacking Arrangement of Tungsten Disulfide at the Gold Contact. ACS Nano, 15(11), pp. 18060-18070. 10.1021/acsnano.1c06676

Smyth, C.M., Cain, J.M., Lang, E.J., Madden, N.J., Hattar, K., Yan, X., Yuan, J., Bland, M., Ohta, T., Sangwan, V., Hersam, M., Chou, S.S., & Lu, T.M. (2021). Heavy Ion Irradiation Effects on MoS2 Memtransistors [Conference Presentation]. 10.2172/1899528

Ohta, T., Berg, M., Liu, A., Smith, S., Copeland, R., Chan, C., Mohite, A.D., & Beechem, T.E. (2021). Sub-surface imaging of atomically-thin semiconductors beneath dielectrics based on optical standing wave using photoelectron emission microscopy with deep-ultraviolet photoexcitation [Conference Presentation]. 10.2172/1891974

Kazanowska, B.A., Sapkota, K.R., Lu, P., Talin, A.A., Bussmann, E., Ohta, T., Gunning, B.P., Jones, K., & Wang, G.T. (2021). Fabrication and field emission properties of vertical, tapered GaN nanowires etched via phosphoric acid [Conference Presentation]. 10.2172/1882100

Schultz, P.A., Hjalmarson, H.P., Berg, M., Bussmann, E., Scrymgeour, D., Ohta, T., & Moore, C.H. (2021). First-principles calculations of metal surfaces. II. Properties of low-index platinum surfaces toward understanding electron emission. Physical Review B, 103(19). 10.1103/physrevb.103.195427

Sharma, P.A., Ohta, T., Sugar, J.D., & Michael, J.R. (2021). Ex Situ Photoelectron Emission Microscopy of Polycrystalline Bismuth and Antimony Telluride Surfaces Exposed to Ambient Oxidation. ACS Applied Materials and Interfaces, 13(15), pp. 18218-18226. 10.1021/acsami.0c22725

Beechem, T.E., Ohta, T., Berg, M., & Mohite, A. (2021). Polarization, DUV-Photoemission & Electromagnetic Field Imaging [Conference Presentation]. 10.2172/1888714

Hopkins, M.M., Bussmann, E., Ohta, T., Jindal, A.K., Roberds, N.A., & Moore, C. (2021). Developing Field Emission Models Employing Nanoscale Surface Characterization [Conference Presentation]. 10.2172/1881673

Moore, C.H., Bussmann, E., Ohta, T., Jindal, A.K., Roberds, N.A., & Hopkins, M.M. (2021). Micron-scale Field Emission Model for PIC-DSMC Simulations Based on Nanoscale Surface Characterization [Conference Poster]. 10.2172/1855332

Hopkins, M.M., Jindal, A.K., Bussmann, E., Ohta, T., Berg, M., Thomas, C., Scrymgeour, D., Clem, P., & Moore, C.H. (2020). Employing Nanoscale Surface Characterizations in a Field Emission Model [Conference Poster]. 10.2172/1835000

Bussmann, E., Ohta, T., Kazanowska, B.A., Wang, G.T., & Tandon, R. (2020). Stronger field-emission science via coupling novel nanoscale imaging techniques. 10.2172/1670519

Thomas, C., Diantonio, C., Chavez, T.P., Montoya, P., Garcia, E., Dickens, S.M., Brumbach, M.T., Chow, R., Rosenberg, S.G., & Ohta, T. (2020). ZnO Update (06/29/2020) [Presentation]. https://www.osti.gov/biblio/1808029

Moore, C.H., Jindal, A.K., Bussmann, E., Ohta, T., Berg, M., Thomas, C., Clem, P., & Hopkins, M.M. (2020). Progress in micron-scale field emission models based on nanoscale surface characterization for use in PIC-DSMC vacuum arc simulations [Conference Presentation]. Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV. 10.2172/1888975

Ohta, T. (2019). Experimental Determination of the Ionization Energies of MoSe2 WS2 and MoS2 Using Photoemission Electron Microscopy [Presentation]. https://www.osti.gov/biblio/1646412

Ohta, T., Berg, M., Foulk, J.W., Chan, C., Keyshar, K., Zhang, X., Vajtai, R., Gupta, G., Ajayan, P., & Mohite, A. (2019). Experimental Determination of the Ionization Energies of MoSe2 WS2 and MoS2 Using Photoemission Electron Microscopy [Conference Poster]. https://www.osti.gov/biblio/1643573

Moore, C.H., Jindal, A.K., Bussmann, E., Ohta, T., Berg, M., Thomas, C., Scrymgeour, D., Clem, P., & Hopkins, M.M. (2019). Field Emission Model for PIC-DSMC Simulations Based on Nanoscale Surface Characterization [Conference Poster]. https://www.osti.gov/biblio/1641939

Jindal, A.K., Moore, C.H., Bussmann, E., Ohta, T., Berg, M., Thomas, C., Scrymgeour, D., Clem, P., & Hopkins, M.M. (2019). Modeling the Role of Beta on Vacuum Field Emission in PIC DSMC Simulations: Scalilng from Nano to Meso Scale [Conference Poster]. https://www.osti.gov/biblio/1641970

Ohta, T. (2019). PEEM as a new Metrology Tool to Examine the Electronic Structures of 2D Crystals on Silicon Oxide [Conference Poster]. https://www.osti.gov/biblio/1641566

Crawford, M.H., Rice, A., Allerman, A., Spataru, C.D., Foulk, J.W., & Ohta, T. (2019). Hexagonal BN: Recent Advances and Potential for UV Optoelectronics (invited) [Conference Poster]. https://www.osti.gov/biblio/1641674

Ohta, T., Berg, M., Foulk, J.W., Chan, C., Keyshar, K., Bilgin, I., Liu, F., Yamaguchi, H., Zhang, X., Vajtai, R., Gupta, G., Kar, S., Ajayan, P., & Mohite, A.D. (2019). Electronic band alignment of few-layer transition metal dichalcogenides on SiO2 [Conference Poster]. https://www.osti.gov/biblio/1639692

Ohta, T. (2019). AFRL cathode electron microscopy update 2019-02 [Presentation]. https://www.osti.gov/biblio/1602926

Crawford, M.H., Rice, A., Allerman, A., Foulk, J.W., Ohta, T., Medlin, D.L., Spataru, C.D., Figiel, J.J., Foulk, J.W., & Sharps, P. (2019). Growth of hBN by High-Temperature Metal-Organic Chemical Vapor Deposition [Conference Poster]. https://www.osti.gov/biblio/1599274

Ohta, T. (2019). Bi2Te3 bare vs Al2O3 covered [Slides]. 10.2172/1491600

Ohta, T. (2019). LaB6 nanostructures - wet vs dry etch [Slides]. 10.2172/1491599

Ohta, T., Robinson, J.T., Culbertson, J., & Berg, M. (2018). Work function variations in twisted graphene layers. Scientific Reports, 8(1). 10.1038/s41598-018-19631-4

Ohta, T., & Copeland, R. (2018). Testing the possibility of magnetic domain imaging based on circular & linear dichroism using photoemission electron microscopy. 10.2172/1760415

Ohta, T. (2018). Epi-graphene PEEM summary (cw laser comissioning) [Presentation]. https://www.osti.gov/biblio/1574574

Ohta, T., Berg, M., Kephart, J.M., Munshi, A., Sampath, W.S., & Chan, C. (2018). Photoemission electron microscopy as a new tool to study the electronic properties of an inhomogeneous semiconductor for photovoltaics [Conference Poster]. https://www.osti.gov/biblio/1592642

Hopkins, M.M., Berg, M., Bussmann, E., Smith, S., Scrymgeour, D., Ohta, T., Clem, P., & Moore, C.H. (2018). Detailed Characterization of Surface Structure and Influence on Field Emission [Conference Poster]. 10.1109/DEIV.2018.8536891

Ohta, T. (2018). PEEM capability at CINT Sandia National Laboratories [Presentation]. https://www.osti.gov/biblio/1570952

Ohta, T. (2018). How we map potential landscapes using photoemission electron microscopy [Presentation]. https://www.osti.gov/biblio/1529838

Bussmann, E., Ohta, T., Scrymgeour, D., Brumbach, M.T., Smith, S., Hjalmarson, H.P., Schultz, P.A., Clem, P., Hopkins, M.M., Moore, C.H., & Berg, M. (2018). Field emission from Pt thin films with disorder [Conference Poster]. https://www.osti.gov/biblio/1526805

Hopkins, M.M., Berg, M., Bussmann, E., Smith, S., Scrymgeour, D., Ohta, T., Clem, P., & Moore, C.H. (2018). Detailed characterization of surface structure and influence on field emission [Conference Poster]. 10.1109/DEIV.2018.8536891