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Physicists find misaligned carbon sheets yield unparalleled properties

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Home > Press > Physicists find misaligned carbon sheets yield unparalleled properties

Graphene is a single layer of carbon atoms arranged in a flat honeycomb pattern, where each hexagon is formed by six carbon atoms at its vertices. University of Texas at Dallas physicists are studying the electrical properties that emerge when two layers of graphene are stacked. CREDIT
University of Texas at Dallas
Graphene is a single layer of carbon atoms arranged in a flat honeycomb pattern, where each hexagon is formed by six carbon atoms at its vertices. University of Texas at Dallas physicists are studying the electrical properties that emerge when two layers of graphene are stacked. CREDIT
University of Texas at Dallas

Abstract:
A material composed of two one-atom-thick layers of carbon has grabbed the attention of physicists worldwide for its intriguing — and potentially exploitable — conductive properties.

This animation shows what happens when two stacked graphene layers are misaligned by a small amount called a twist angle. A new periodic design in the mesh emerges, called a moiré pattern. UT Dallas physicists are investigating how the twist angle affects the electronic properties of such twisted bilayer graphene.

Physicists find misaligned carbon sheets yield unparalleled properties


Austin, TX | Posted on July 31st, 2020

Dr. Fan Zhang, assistant professor of physics in the School of Natural Sciences and Mathematics at The University of Texas at Dallas, and physics doctoral student Qiyue Wang published an article in June with Dr. Fengnian Xia’s group at Yale University in Nature Photonics that describes how the ability of twisted bilayer graphene to conduct electrical current changes in response to mid-infrared light.

From One to Two Layers

Graphene is a single layer of carbon atoms arranged in a flat honeycomb pattern, where each hexagon is formed by six carbon atoms at its vertices. Since graphene’s first isolation in 2004, its unique properties have been intensely studied by scientists for potential use in advanced computers, materials and devices.

If two sheets of graphene are stacked on top of one another, and one layer is rotated so that the layers are slightly out of alignment, the resulting physical configuration, called twisted bilayer graphene, yields electronic properties that differ significantly from those exhibited by a single layer alone or by two aligned layers.

“Graphene has been of interest for about 15 years,” Zhang said. “A single layer is interesting to study, but if we have two layers, their interaction should render much richer and more interesting physics. This is why we want to study bilayer graphene systems.”

A New Field Emerges

When the graphene layers are misaligned, a new periodic design in the mesh emerges, called a moiré pattern. The moiré pattern is also a hexagon, but it can be made up of more than 10,000 carbon atoms.

“The angle at which the two layers of graphene are misaligned — the twist angle — is critically important to the material’s electronic properties,” Wang said. “The smaller the twist angle, the larger the moiré periodicity.”

The unusual effects of specific twist angles on electron behavior were first proposed in a 2011 article by Dr. Allan MacDonald, professor of physics at UT Austin, and Dr. Rafi Bistritzer. Zhang witnessed the birth of this field as a doctoral student in MacDonald’s group.

“At that time, others really paid no attention to the theory, but now it has become arguably the hottest topic in physics,” Zhang said.

In that 2011 research MacDonald and Bistritzer predicted that electrons’ kinetic energy can vanish in a graphene bilayer misaligned by the so-called “magic angle” of 1.1 degrees. In 2018, researchers at the Massachusetts Institute of Technology proved this theory, finding that offsetting two graphene layers by 1.1 degrees produced a two-dimensional superconductor, a material that conducts electrical current with no resistance and no energy loss.

In a 2019 article in Science Advances, Zhang and Wang, together with Dr. Jeanie Lau’s group at The Ohio State University, showed that when offset by 0.93 degrees, twisted bilayer graphene exhibits both superconducting and insulating states, thereby widening the magic angle significantly.

“In our previous work, we saw superconductivity as well as insulation. That’s what’s making the study of twisted bilayer graphene such a hot field — superconductivity. The fact that you can manipulate pure carbon to superconduct is amazing and unprecedented,” Wang said.

New UT Dallas Findings

In his most recent research in Nature Photonics, Zhang and his collaborators at Yale investigated whether and how twisted bilayer graphene interacts with mid-infrared light, which humans can’t see but can detect as heat. “Interactions between light and matter are useful in many devices — for example, converting sunlight into electrical power,” Wang said. “Almost every object emits infrared light, including people, and this light can be detected with devices.”

Zhang is a theoretical physicist, so he and Wang set out to determine how mid-infrared light might affect the conductance of electrons in twisted bilayer graphene. Their work involved calculating the light absorption based on the moiré pattern’s band structure, a concept that determines how electrons move in a material quantum mechanically.

“There are standard ways to calculate the band structure and light absorption in a regular crystal, but this is an artificial crystal, so we had to come up with a new method,” Wang said. Using resources of the Texas Advanced Computing Center, a supercomputer facility on the UT Austin campus, Wang calculated the band structure and showed how the material absorbs light.

The Yale group fabricated devices and ran experiments showing that the mid-infrared photoresponse — the increase in conductance due to the light shining — was unusually strong and largest at the twist angle of 1.8 degrees. The strong photoresponse vanished for a twist angle less than 0.5 degrees.

“Our theoretical results not only matched well with the experimental findings, but also pointed to a mechanism that is fundamentally connected to the period of moiré pattern, which itself is connected to the twist angle between the two graphene layers,” Zhang said.

Next Step

“The twist angle is clearly very important in determining the properties of twisted bilayer graphene,” Zhang added. “The question arises: Can we apply this to tune other two-dimensional materials to get unprecedented features? Also, can we combine the photoresponse and the superconductivity in twisted bilayer graphene? For example, can shining a light induce or somehow modulate superconductivity? That will be very interesting to study.”

“This new breakthrough will potentially enable a new class of infrared detectors based on graphene with high sensitivity,” said Dr. Joe Qiu, program manager for solid-state electronics and electromagnetics at the U.S. Army Research Office (ARO), an element of the U.S. Army Combat Capabilities Development Command’s Army Research Laboratory. “These new detectors will potentially impact applications such as night vision, which is of critical importance for the U.S. Army.”

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In addition to the Yale researchers, other authors included scientists from the National Institute for Materials Science in Japan. The ARO, the National Science Foundation and the Office of Naval Research supported the study.

####

For more information, please click here

Contacts:
Amanda Siegfried
972-883-4335

@ut_dallas

Copyright © University of Texas at Austin

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STid SPECTRE nano Reader Accelerates Car Park Access Control with…

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Easy to use, “all terrain” reader

The next generation, hands-free reader increases speed of entry for anyone – or anything – on two feet, two wheels, four wheels or a whole fleet. It reads windshield tags, key fobs, cards, smartphones, or wearables using UHF and Bluetooth® to leverage end-user preferences for easier adoption. It is also part of the STid Mobile ID® ecosystem, which turns smartphones into virtual cards for both vehicle and pedestrian access control.

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Designed for global customers, SPECTRE nano uses OSDP™ and SSCP® protocols and has EAL5+-certified storage. Data authenticity and confidentiality are ensured using encryption methods recommended by worldwide organizations, e.g., ANSSI- & FIPs-compliant. Encrypted, signed credentials provide anti-cloning and anti-replay protection and managers can quickly erase security keys, when necessary.

SPECTRE nano will be available in October to help speed car park access control. For more information, please visit our SPECTRE Nano page.

About STid

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For more information contact: [email protected]

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AerNos AerHome

Many factors, including COVID-19, wildfires and other climate-related extreme weather, have raised awareness about indoor air and the health implications. We are leveraging our experience to help make people smarter about the air in their homes and keep their families healthy

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About AerNos

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Powercast’s RF Wireless Power Technology Awarded for Global…

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Powercast aims to save millions of one-time-use batteries from entering landfills yearly

Powercast’s RF Wireless Power Technology Wins Global Sustainability Award for Reducing Battery Use, E-Waste

We’re partnering with many manufacturers to create wirelessly rechargeable devices that keep batteries out of landfills. Charles Goetz, CEO of Powercast.

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High Performance, Closed-Loop Piezo Controller with Integrated Piezo…

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Learn about PI’s new high-performance, compact digital closed-loop piezo controller that’s cost effective too!

Learn about PI’s new high-performance, compact digital closed-loop piezo controller that’s cost effective too!

Based on 5 decades of piezo driver and motion controller expertise, PI’s digital piezo controller family grows again with the next generation E-709 closed-loop piezo controller and integrated driver, well suited for applications that require high performance motion with nanometer precision such as found in semiconductor surface metrology, autofocus systems, medical apparatus, laser-beam steering, 3D imaging, and multiphoton and confocal microscopy.

Digital Controller with Fast Focus and Freeze, Automated Scans, Software Support

The new E-709 compact digital piezo servo controller / amplifier and driver was designed providing 20kHz sampling rate, twice the power of its predecessor along with multiple times is positioning resolution. When used in image processing, scanning and microscopy applications, its advanced features such as high-performance linearization, high speed tracking, and PI’s unique F3 capability (Fast Focus & Freeze) come in handy. When used with a fast objective focusing motor such as the P-725, the autofocus drive can be bumplessly switched from an external (focus) sensor to the integrated position sensor inside the focusing stage. This feature allows for calibrated, precise, and highly stable motions on a nanometer scale, with respect to the focal plane.

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The new E-709 compact digital piezo controller is supported by a comprehensive software package including drivers for LabVIEW, dynamic libraries for Windows and Linux, MATLAB, MetaMorph, µManager, etc. Despite all servo operations inside the controller are of digital nature, an additional analog control interface with high resolution A/D converters is included for ease of use with existing analog signals. Digital interfaces include USB, SPI, RS-232. Supported functions include Wave generator, data recorder, auto zero, and trigger I/O. The following article explains the difference between digital piezo servo controllers and analog piezo controllers.

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Several application parameters should be considered when selecting the right closed-loop piezo controller for a specific nanopositioning or high-speed precision motion task. Examples are

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To learn more on this subject, a selection guide on Piezo Controllers and Mechanisms is available.

Safety Monitoring, Temperature Management

Short-circuit proof, the E-709 provides safety and monitoring functionality with continuous input/output measurements as well as internal temperature. The driver is adaptable to a wide variety of operating conditions and temperature stable within 10 minutes of powering on.

Datasheet» E-709 Compact, High Performance Closed-Loop Piezo Controller with Integrated Voltage Amplifier

Working with You

PI’s in-house engineered solutions have enabled customers around the world to increase their productivity and technological advantage for 5 decades. With a large basis of proven motion technologies and methodologies, PI is in the position to quickly modify existing designs or provide a fully customized OEM solution to fit the exact requirements of your application from sensors and piezo transducers to microscope nano-focus units, fast photonics alignment systems to multi-axis automation sub-systems.

USA / Canada

http://www.pi-usa.us | [email protected] | (508) 832-3456

About PI

PI is a privately held company that designs and manufactures world-class precision motion and automation systems including air bearings, hexapods and piezo drives at locations in North America, Europe, and Asia. The company was founded 5 decades ago and today employs more than 1300 people worldwide. PI’s customers are leaders in high-tech industries and research institutes in fields such as photonics, life-sciences, semiconductors, and aerospace.

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