Výsledky vyhledávání - "Emily S. Walker"

Versatile Large-Area Custom-Feature van der Waals Epitaxy of Topological Insulators

Autor: Anupam Roy, Tanuj Trivedi, Emily S. Walker, Dean P. Neikirk, Sanjay K. Banerjee, Seth R. Bank, Hema C. P. Movva

Publikováno v: ACS Nano. 11:7457-7467

As the focus of applied research in topological insulators (TI) evolves, the need to synthesize large-area TI films for practical device applications takes center stage. However, constructing scalable and adaptable processes for high-quality TI compo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01b968d8c84b0d2efacca374c167b64a
https://doi.org/10.1021/acsnano.7b03894

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Composition-dependent structural transition in epitaxial Bi1−xSbx thin films on Si(111)

Autor: Alice Yau, Minjoo Larry Lee, Christopher J. Brennan, Andrew Briggs, Kenneth M. Liechti, Sarah Muschinske, Seung Ryul Na, E. M. Krivoy, Deji Akinwande, Emily S. Walker, Edward T. Yu, Tianhao Yang, Yukun Sun, Tanuj Trivedi, Stephen D. March, Daehwan Jung, Seth R. Bank

Publikováno v: Physical Review Materials. 3

Bismuth-antimony alloys (${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x}$) are topological insulators between 7 and 22% Sb in bulk crystals, with an unusually high conductivity suitable for spin-orbit torque applications. Reducing the thickness of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3031b4b5b73338d3be3988cddfe663c1
https://doi.org/10.1103/physrevmaterials.3.064201

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Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures

Autor: Emily S. Walker, P. G. Gowtham, Niklas Roschewsky, Sayeef Salahuddin, Seth R. Bank, Frances Hellman, Sarah Muschinske

Publikováno v: Physical Review B, vol 99, iss 19
Roschewsky, Niklas; Walker, Emily S; Gowtham, Praveen; Muschinske, Sarah; Hellman, Frances; Bank, Seth R; et al.(2019). Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures. Physical Review B, 99(19). doi: 10.1103/physrevb.99.195103. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/8fr240cp

Harmonic measurements of the longitudinal and transverse voltages in Bi-Sb/Co bilayers are presented. A large second harmonic voltage signal due to the ordinary Nernst effect is observed. In experiments where a magnetic field is rotated in the film p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f573b9549332533248273bf93507e684
https://escholarship.org/uc/item/8fr240cp

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Vis-NIR photodetector with microsecond response enabled by 2D bismuth/Si(111) heterojunction

Autor: Zhenhua Ni, Deji Akinwande, Li Tao, Emily S. Walker, Jiayi Chen, Wenhui Wang, Zhaoying Dang, Seth R. Bank

Publikováno v: 2D Materials. 8:035002

Atomic sheets of bismuth (Bi) have been expected to yield exotic optoelectronic properties, holding great promise for photodetector devices. However, existing Bi thin film photodetectors have limited performance in terms of photoresponsivity or respo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d5dbb15c38805d49156aa185b986f764
https://doi.org/10.1088/2053-1583/abea65

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Large-Area Dry Transfer of Single-Crystalline Epitaxial Bismuth Thin Films

Autor: Minjoo Larry Lee, Stephen D. March, Kenneth M. Liechti, Wei Li, Daehwan Jung, Tanuj Trivedi, Li Tao, Seth R. Bank, Joon-Seok Kim, Deji Akinwande, Emily S. Walker, Seung Ryul Na

Publikováno v: Nano Letters. 16:6931-6938

We report the first direct dry transfer of a single-crystalline thin film grown by molecular beam epitaxy. A double cantilever beam fracture technique was used to transfer epitaxial bismuth thin films grown on silicon (111) to silicon strips coated w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c139c9afd5a653954cb3362829606a2
https://doi.org/10.1021/acs.nanolett.6b02931

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Anisotropic thermoelectric effect and field-effect devices in epitaxial bismuthene on Si (111)

Autor: Deji Akinwande, Li Tao, Emily S. Walker, Jingjie Sha, Wen Zhong, Yunfei Chen, Beibei Zhu, Seth R. Bank, Yu Zhao

Publikováno v: Nanotechnology. 31:475202

This experimental study reveals intriguing thermoelectric effects and devices in epitaxial bismuthene, two-dimensional (2D) bismuth with thickness ⩽30 nm, on Si (111). Bismuthene exhibits interesting anisotropic Seebeck coefficients varying 2-5 tim

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7473fd9b35848ed0d5cc8d8b78c35789
https://doi.org/10.1088/1361-6528/abaf1f

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Phase transition in epitaxial bismuth nanofilms

Autor: Yongjian Zhou, Raul David Montaño, Emily S. Walker, Yaguo Wang, Feng He, Seth R. Bank

Publikováno v: Applied Physics Letters. 117:073103

Raman and coherent phonon spectroscopies were used to investigate the thickness-dependent phononic properties of ultrathin single-crystal Bi films prepared by molecular beam epitaxy on Si(111) substrates. Both the A1g and Eg Raman peaks disappeared i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::350532416e3804c4f2818c089748afef
https://doi.org/10.1063/5.0016793

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Quantum confinement of coherent acoustic phonons in transferred single-crystalline bismuth nanofilms

Autor: Sarah Muschinske, Yaguo Wang, Feng He, Emily S. Walker, Yongjian Zhou, Seth R. Bank

Publikováno v: Applied Physics Letters. 116:263101

Coherent acoustic phonon dynamics in single-crystalline bismuth nanofilms transferred to a glass substrate were investigated with ultrafast pump–probe spectroscopy. Coherent phonon signals were substantially enhanced by more than four times when co

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eac1ab448c21159061fd4ea08ba2e815
https://doi.org/10.1063/5.0007168

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