QUANTUM INSTRUMENT DEVELOPMENT

AQUILON is a sub-kelvin 14 Tesla scanned Josephson tunneling microscope.

A.Figure 1. Atomic-scale engineered emergent behavior induced by an STM tip on AQUILON.(A) STM topography T(r) showing isolated Cs adatoms and single Sb vacancies on the Sb surface. (B) STM image of a one-dimensional Cs atomic chain assembled by tip manipulation (scale bar: 2 nm). (C) Atom-by-atom manipulation of Cs adatoms to write "UCC" on the surface (scale bar: 5 nm).

Figure 2. Overview of the AQUILON STM system. A. Aquilon including vibration isolation table and liquid helium dewar B. Jiahao Yan preparing for Josephson STM imaging experiments at AQUILON

Figure 3. Design and development of the AQUILON STM system.(A) Sectional engineering drawing of AQUILON. (B) Cryogenic insert, showing the radiation baffles, 4 K plate, 1 K plate, mixing chamber plate, and STM head. (C) Zoomed-in photograph of the STM head highlighting the tip-sample region. (D) Assembled STM head. (E) Optically imaged freshly cleaved CVS surface to be approached and investigated by the STM tip.

Figure 4. Topographic imaging of TMD materials scanned by AQUILON.(A) STM topography T(r) of NbSe2 exhibiting a 3x3 charge density wave (CDW). (B) STM topography T(r) of CuxTiSe2 showing 2x2 CDW. Insets highlight the atomic lattice and CDW modulation (scale bars: 2 nm).