Solid-state reaction synthesis of superconducting refractory-metal germanides for Ge/SiGe quantum devices

Posted by klaurent Delft, This Week: Nanoscience

Kavli Affiliate: Giordano Scappucci | Summary:Solid-phase reactions offer a route to integrate superconductors into Ge/SiGe heterostructures, but forming high-quality superconducting layers near the buried Ge quantum well remains challenging. We investigate reactions of V, Ta, and Nb with elemental Ge and with the Si$_0.2$Ge$_0.8$ barrier of Ge/SiGe heterostructures at processing temperatures of 365-390 $^circ$C. Cross-sectional […]


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Nuclear mass table in deformed relativistic Hartree-Bogoliubov theory in continuum, III: nuclei with $8 leq Z leq 120$

Posted by klaurent Caltech, This Week: Nanoscience

Kavli Affiliate: Wei Gao| Summary:The mass table in the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) with the PC-PK1 density functional has been established for nuclei with $8 leq Z leq 120$, extended from the previous works for even-even nuclei [Zhang et al. (DRHBc mass table collaboration), At. Data Nucl. Data Tables 144, 101488 (2022)] […]


Continue.. Nuclear mass table in deformed relativistic Hartree-Bogoliubov theory in continuum, III: nuclei with $8 leq Z leq 120$

Synthesis of Metal-Semiconductor Heterojunctions in Single Graphene Nanoribbons

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Michael Crommie | Summary:Graphene nanoribbons (GNRs) are a highly tunable class of one-dimensional (1D) quantum materials that can be fabricated through bottom-up synthesis. Precise control over GNR band gaps and band-edge alignments has established them as a promising nanoelectronics platform, but forming high-quality electronic interfaces remains challenging. Here we combine sequential on-surface synthesis […]


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Independent Amplitude and Phase Modulation in Active Transmissive Metasurfaces via Complex Permittivity Tuning

Posted by klaurent Caltech, This Week: Nanoscience

Kavli Affiliate: Harry Atwater | Summary:Active metasurfaces are a promising platform for spatial light modulators (SLMs) in applications such as holography, beam shaping, and light detection and ranging (LiDAR), as they enable dynamic control over the amplitude and phase of light at subwavelength scales. Among these, transmissive metasurfaces offer a compact alternative to conventional SLMs, […]


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Parallax Depth Sectioning and 3D Reconstruction in 4D-STEM

Posted by klaurent Cornell, This Week: Nanoscience

Kavli Affiliate: David Muller | Summary:Three-dimensional (3D) information is encoded in four-dimensional scanning transmission electron microscopy (4D-STEM) through parallax between the virtual images formed at each detector pixel. In this paper we connect the encoding and retrieval of depth-dependent information in 4D-STEM to two other widely-used 3D imaging methods, tomography and light-field photography, and derive […]


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Strongly coupled ultracompressed self-cavity plasmon polaritons at millikelvin temperatures

Posted by klaurent Cornell, This Week: Nanoscience

Kavli Affiliate: Debanjan Chowdhury | Summary:Van der Waals heterostructures exhibit self-cavity resonances from sub-terahertz to terahertz frequencies and thus offer an attractive route toward realizing cavity-modified phases of matter. Spectroscopy of such systems calls for high frequency resolution at millikelvin temperatures, which is extremely challenging with existing methods. Here we demonstrate a new platform for […]


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Design of Mechanically Compliant Membrane Reflectors for Giant Optical Phase Nonlinearity

Posted by klaurent Caltech, This Week: Nanoscience

Kavli Affiliate: Harry Atwater | Summary:Optical nonlinearities arise when the response of a photonic system depends on light intensity. Radiation pressure can create such a nonlinearity by moving a mechanically compliant reflector, thereby shifting the phase of the reflected light. Based on measured properties, we predict a giant phase responsivity of 263 rad W$^-1$ and […]


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Geometric Characterization and Feasible Region Analysis of Bipartite Qutrit Bound Entanglement

Posted by klaurent Delft, This Week: Nanoscience

Kavli Affiliate: Mazhar Ali | Summary: We characterize bound entanglement in bipartite qutrit systems by combining the Positive Partial Transpose (PPT) criterion with a structural, non-completely positive map. Focusing on a comprehensive three-parameter bipartite qutrit family $ρ_a,b,c$, we present an exact analytical and geometric partitioning of the physical state space simplex. We derive the closed-form […]


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Normal-ordered perturbative expansion for matter systems interacting with continuous-mode quantum photon fields

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Birgitta Whaley | Summary:We develop a normal-ordered perturbative expansion method to compute the reduced dynamics of a matter system interacting with a general continuous-mode photon field state. In this expansion, all field correlation functions are automatically normal-ordered, while the free evolution is modified by spontaneous emission. Our normal-ordered expansion elucidates the physical meaning […]


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Input-output formulation of quantum light spectroscopy

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Birgitta Whaley | Summary:We develop an input-output formulation of quantum light spectroscopy (QLS) by combining the input-output theory, commonly used in quantum optics, with the perturbative expansion method for nonlinear spectroscopy, commonly used in chemical physics. The use of the input-output relation provides physical intuition for how matter systems alter the photon input […]


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