Nanophysics

News and Updates

With Some Bumps, NIST Scientists Devise a Novel Way to Extend the Wavelength Range of Microcombs

June 5, 2024

Microcombs – chip-scale devices that generate and measure frequencies of light with exquisite accuracy – have transformed timekeeping and boosted optical

NIST Researchers Help Design a Prototype Quantum Computer

December 20, 2023

Researchers have created a prototype quantum computer with a record number of qubits—the analog of bits in an ordinary computer—capable of performing logical

Do the Bump: NIST Scientists Perfect Miniaturized Technique to Generate Precise Wavelengths of Visible Laser Light

November 28, 2023

In research, sometimes the bumpy path proves to be the best one. By creating tiny, periodic bumps in a miniature racetrack for light, researchers at the

Projects and Programs

Nanoscale Spectroscopy for Advanced Electronics, Quantum Materials and Devices

Ongoing

Semiconductor technologies are critical to U.S. economic and national security as they are essential to modern life in communications, healthcare, energy, etc. and also underpin many emerging technologies like quantum, artificial intelligence, high power electronics and advanced wireless (6G+). The

Video microscopic image - Rotation and translation.

Control of Magnetic Nanoparticles for Nanoscale Manipulation of Fluids and Materials (Archived)

Completed

Low Reynolds number swimming, or motion through a viscous fluid, is a technique at which nature is adept. Bacteria, protists, and algal cells live in a regime where viscous effects dominate inertial ones. As these microscale biological swimmers move, they perturb the fluid around them, affecting

Fabrication and Metrology of Novel Magnetic Tunnel Junctions in the Ultra-thin Barrier Limit

Completed

Within a broader program of exploring methods to fabricate structures with novel electronic properties at the nanometer scale, we are using highly charged ions (HCIs) to produce ensembles of nano-features within magnetic tunnel junctions (MTJs). Technologically, MTJs are a major component of

Measuring the Magneto-Electronic Properties of Graphene on the Nanometer Scale

Ongoing

The energy spectrum of graphene's charge carriers is very different from ordinary metals and semiconductors. The conduction and valance bands meet at conical points, where the carriers have an energy that is linear in momentum, giving rise to a zero effective mass [Fig.1(a)]. This dispersion is

Publications

Nagaoka ferromagnetism in 3 × 3 arrays and beyond

December 26, 2024

Author(s)

Yan Li, Keyi Liu, Garnett Bryant

Nagaoka ferromagnetism (NF) is a long-predicted example of itinerant ferromagnetism (IF) in the Hubbard model that has been studied theoretically for many years

Fermi-Level Pinning in ErAs Nanoparticles Embedded in III–V Semiconductors

April 9, 2024

Author(s)

Garnett W. Bryant, Ruiqi Hu, Dai Ho, Quang To, Anderson Janotti

Embedding rare-earth pnictide (RE-V) nanoparticles into III-V semiconductors enables unique optical, electrical, and thermal properties, with applications in

Metrology for 2D materials: a perspective review from the international roadmap for devices and systems

April 8, 2024

Author(s)

Albert Davydov, Yaw S. Obeng, Ndubuisi George Orji, Umberto Celano, Daniel Schmidt, Carlos Beitia

The international roadmap of devices and systems (IRDS) projects that 2D materials will be inserted into high-volume manufacturing as channel materials, mostly

Single-particle approach to many-body relaxation dynamics

February 26, 2024

Author(s)

Garnett W. Bryant, Marta Pelc, David Dams, Abhishek Ghosh, Miriam Kosik, Marvin Muller, Carsten Rockstuhl, Andres Ayuela, Karolina Slowik

This study addresses the challenge of modeling relaxation dynamics in quantum many-body systems, specifically focusing on electrons in graphene nanoflakes

Tools and Instruments

NIST PTIR Instrumentation and Capabilities

Photothermal induced resonance (PTIR) combines the spatial resolution of atomic force microscopy (AFM) with the specificity of absorption spectroscopy

Local Electrode Atom Probe Tomography (LEAP)

Field evaporates (with a voltage and laser pulse) a sharp tip-shaped specimen. Collects the ionization products in a position-sensitive, time-of-flight mass