Kavli Affiliate: Grace Xing | Summary:UV-C LEDs pseudomorphically grown by MBE on bulk AlN substrates emitting at 265 nm are demonstrated. High current density up to 800 A/cm$^2$, 5 orders of on/off ratio, and low differential on-resistance of 2.6 m$Ωcdot$cm$^2$ at the highest current density is achieved. The LED heterostructure has a high refractive index […]
Kavli Affiliate: David Muller | Summary:Animated characters often move in non-physical ways and have proportions that are far from a typical walking robot. This provides an ideal platform for innovation in both mechanical design and stylized motion control. In this paper, we bring Olaf to life in the physical world, relying on reinforcement learning guided […]
Kavli Affiliate: Debanjan Chowdhury | Summary:The observation of Planckian scattering, often inferred from Drude fits in strongly correlated metals, raises the question of how to extract an intrinsic timescale from measurable quantities in a model-independent way. We address this by focusing on a ratio ($calB$) of spectral moments of the dissipative part of the optical […]
Kavli Affiliate: Grace Xing | Summary:Ohmic contacts to high (>70%) Al content n-type Al$_x$Ga$_1-x$N ultra-wide bandgap semiconductor layers in nitride electronic and photonic devices are typically fabricated by a lift-off process and high temperature ($>700^circ$C) thermal alloying. These conditions often result in significant structural deformations of the fabricated structures and impose a harsh thermal budget […]
Kavli Affiliate: Debanjan Chowdhury | Summary:Two-dimensional transition metal dichalcogenide (TMD) semiconductors exhibit a wide range of novel phenomena at millielectronvolt (terahertz-frequency) energy scales, including superconducting and correlation-induced insulating gaps that are frequently accompanied by symmetry breaking. However, due to the subwavelength dimensions and the often low conductivities of these systems, their intrinsic THz plasmons and […]
Kavli Affiliate: Grace Xing | Summary:We report the structural and electronic properties of niobium nitride (NbN) thin films grown by molecular beam epitaxy on c-plane sapphire with miscut angles of $0.5^texto$, $2^texto$, $4^texto$, and $10^texto$ towards m-axis. X-ray diffraction (XRD) scans reveal that the full width at half maximum of the rocking curves around the […]
Kavli Affiliate: Daniel C. Ralph| First 5 Authors: Asraful Haque, Asraful Haque, , , | Summary:Autonomous laboratories typically rely on data-driven decision-making, occasionally with human-in-the-loop oversight to inject domain expertise. Fully leveraging AI agents, however, requires tightly coupled, collaborative workflows spanning hypothesis generation, experimental planning, execution, and interpretation. To address this, we develop and deploy […]
Kavli Affiliate: Grace Xing | Summary:Aluminum scandium nitride (AlScN) is a promising barrier material for gallium nitride (GaN)-based transistors for the next generation of radio-frequency electronic devices. In this work, we examine the transport properties of two dimensional electron gases (2DEGs) in single- and multi-channel AlScN/GaN heterostructures grown by molecular beam epitaxy, and demonstrate the […]
Kavli Affiliate: David Muller| First 5 Authors: Pascal Strauch, Pascal Strauch, , , | Summary:Despite recent advances in robust locomotion, bipedal robots operating in the real world remain at risk of falling. While most research focuses on preventing such events, we instead concentrate on the phenomenon of falling itself. Specifically, we aim to reduce physical […]
Kavli Affiliate: David Muller| First 5 Authors: Pascal Strauch, Pascal Strauch, , , | Summary:Despite recent advances in robust locomotion, bipedal robots operating in the real world remain at risk of falling. While most research focuses on preventing such events, we instead concentrate on the phenomenon of falling itself. Specifically, we aim to reduce physical […]