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The tunability of the chemical potential for a wide range encompassing the Dirac point is important for many future devices based on topological insulators. Here we report a method to fabricate highly efficient top gates on epitaxially…

Mesoscale and Nanoscale Physics · Physics 2015-06-19 Fan Yang , A. A. Taskin , Satoshi Sasaki , Kouji Segawa , Yasuhide Ohno , Kazuhiko Matsumoto , Yoichi Ando

Reversible, diffusionless, first-order solid-solid phase transitions accompanied by caloric effects are critical for applications in the solid-state cooling and heat-pumping devices. Accelerated discovery of caloric materials requires…

Materials Science · Physics 2023-06-22 Nikolai A. Zarkevich , Duane D. Johnson

Two-dimensional (2D) magnets exhibit unique physical properties for potential applications in spintronics. To date, most 2D ferromagnets are obtained by mechanical exfoliation of bulk materials with van der Waals interlayer interactions,…

Thin films of Ti1-xCoxO2 (x=0 and 0.03) have been prepared on sapphire substrates by spin-on technique starting from metalorganic precursors. When heat treated in air at 550 and 700 C respectively, these films present pure anatase and…

Materials Science · Physics 2009-11-10 R. Suryanarayanan , Vaman Naik , Parasuram Kharel , Punya Talgala , Ratna Naik

We report comprehensive angle-resolved photoemission investigations on the electronic structure of single crystal multiple-layer FeSe films grown on CaF2 substrate by pulsed laser deposition (PLD) method. Measurements on FeSe/CaF2 samples…

Superconductivity · Physics 2017-06-20 Bing Shen , Zhongpei Feng , Jianwei Huang , Yong Hu , Qiang Gao , Cong Li , Yu Xu , Guodong Liu , Li Yu , Lin Zhao , Kui Jin , X. J. Zhou

We meticulously study the individual effects of hydrogen irradiation and annealing on the electronic structure and magnetic properties of nanostructured MoS2 thin films grown through Chemical Vapor Deposition (CVD). The role of…

Atomically thin transitional metal ditellurides like WTe2 and MoTe2 have triggered tremendous research interests because of their intrinsic nontrivial band structure. They are also predicted to be 2D topological insulators and type-II Weyl…

The rapid discovery of two-dimensional (2D) van der Waals (vdW) quantum materials has led to heterostructures that integrate diverse quantum functionalities such as topological phases, magnetism, and superconductivity. In this context, the…

PtSe$_2$ is one of the most promising materials for the next generation of piezoresistive sensors. However, the large-scale synthesis of homogeneous thin films with reproducible electromechanical properties is challenging due to…

Changing the interlayer exchange coupling between magnetic layers in-situ is a key issue of spintronics, as it allows for the optimization of properties that are desirable for applications, including magnetic sensing and memory. In this…

Nanoporous metals are a class of nanostructured materials finding extensive applications in multiple fields thanks to their unique properties attributed to their high surface area and interconnected nanoscale ligaments. They can be…

Here, we report a detailed method of growing LaAlGe, a non-magnetic Weyl semimetal, thin film on silicon(100) substrates by molecular beam epitaxy and their structural and electrical characterizations. 50 nm thick LaAlGe films were…

Materials Science · Physics 2020-05-21 Niraj Bhattarai , Andrew W. Forbes , Rajendra P. Dulal , Ian L. Pegg , John Philip

In this work we explore the phase diagram of the binary Nb-S system from ambient pressures up to 250 GPa using $ab$ $initio$ evolutionary crystal structure prediction. We find several new stable compositions and phases, especially in the…

Materials Science · Physics 2021-01-13 Roman Lucrezi , Christoph Heil

Films of Cu-K-In-Se were co-evaporated at varied K/(K+Cu) compositions and substrate temperatures (with constant (K+Cu)/In ~ 0.85). Increased Na composition on the substrate's surface and decreased growth temperature were both found to…

Materials Science · Physics 2017-03-21 Christopher P. Muzzillo , Ho Ming Tong , Timothy J. Anderson

We present a systematic study of the morphology of homoepitaxial InP films grown by metalorganic vapor-phase epitaxy which are imaged with ex situ atomic force microscopy. These films show a dramatic range of different surface morphologies…

Materials Science · Physics 2012-11-02 A. Gocalinska , M. Manganaro , D. D. VVedensky , E. Pelucchi

This paper reports comprehensive results on thin-film growth of 122-type iron-pnictide superconductors, AE(Fe1-xCox)2As2 (AE = Ca, Sr, and Ba, AEFe2As2:Co) by a pulsed laser deposition method using a neodymium-doped yttrium aluminum garnet…

Superconductivity · Physics 2012-08-23 Takayoshi Katase , Hidenori Hiramatsu , Toshio Kamiya , Hideo Hosono

Experimental evidences from transport, magnetic, and magneto-optical (MO) image measurements confirmed that arsenic (As) vapor annealing was another effective way to induce bulk superconductivity with isotropic, large, and homogenous…

Superconductivity has been explored in single crystals of the Ni-doped FeAs-compound SrFe2-xNixAs2 grown by self-flux solution method. The antiferromagnetic order associated with the magnetostructural transition of the parent compound…

Superconductivity · Physics 2011-01-27 Shanta R. Saha , Nicholas P. Butch , Kevin Kirshenbaum , Johnpierre Paglione

Thin films of optimally-doped (001)-oriented YBa2Cu3O7-{\delta} are epitaxially integrated on silicon (001) through growth on a single crystalline SrTiO3 buffer. The former is grown using pulsed-laser deposition and the latter is grown on…

Superconductivity · Physics 2017-10-25 K. Ahmadi-Majlan , H. Zhang , X. Shen , M. J. Moghadam , M. Chrysler , P. Conlin , R. Hensley , D. Su , J. Y. T. Wei , J. H. Ngai

For electrical spin injection and detection of spin-polarized electrons in silicon, we explore highly epitaxial growth of ferromagnetic full-Heusler-alloy Co2FeSi thin films on silicon substrates using low-temperature molecular beam epitaxy…

Materials Science · Physics 2015-05-13 S. Yamada , K. Yamamoto , K. Ueda , Y. Ando , K. Hamaya , T. Sadoh , M. Miyao