• Latest
  • Trending
  • All

Scientists discover new family of quasiparticles in graphene-based materials

August 9, 2021
New Printable, Injectable Materials for Advanced Medical Applications

New Printable, Injectable Materials for Advanced Medical Applications

May 29, 2025
Metal fleece: material for the batteries of the future

Metal fleece: material for the batteries of the future

May 24, 2025
AI and X-ray Vision to Gain Insight into Battery Electrolyte.

AI and X-ray Vision to Gain Insight into Battery Electrolyte

May 23, 2025
Mask users can now breathe easy on two counts

Mask users can now breathe easy on two counts

May 23, 2025
Boosting Cancer Treatment.

Boosting Cancer Treatment

May 23, 2025
Emergence Quantum: a commercial quantum research 'special ops' team

Emergence Quantum: a commercial quantum research ‘special ops’ team

May 22, 2025
Sugar-coated nanotherapy dramatically improves neuron survival in Alzheimer’s model.

Sugar-coated nanotherapy improves neuron survival

May 15, 2025
Quantum simulation of chemical dynamics achieved for first time

Quantum simulation of chemical dynamics achieved for first time

May 15, 2025
The mysterious chemical world inside nanopores.

The Mysterious Chemical World Inside Nanopores

May 13, 2025
Stability solution brings unique form of carbon closer to practical application.

Stability solution brings unique form of carbon closer to practical application

May 10, 2025
It’s Hard to Get Meds to the Lungs: Breathable Algae Offers a New Path.

It’s Hard to Get Meds to the Lungs: Breathable Algae Offers a New Path

May 7, 2025
New Bayesian Method Enables Rapid Detection of Quantum Dot Charge States

New Bayesian Method Enables Rapid Detection of Quantum Dot Charge States

May 2, 2025
  • About
  • Advertise
  • Privacy Policy
  • Terms & Conditions
  • Contact
Sunday, June 1, 2025
  • Login
  • Register
Nanodigest
  • Home
  • Categories
    • Biological Science & Technology
    • Chemical Science & Technology
    • Material Science & Technology
    • Physical Science & Technology
    • Innovations & Education
  • NanoDigestExclusive
    AI and X-ray Vision to Gain Insight into Battery Electrolyte.

    AI and X-ray Vision to Gain Insight into Battery Electrolyte

    Emergence Quantum: a commercial quantum research 'special ops' team

    Emergence Quantum: a commercial quantum research ‘special ops’ team

    Couple satisfaction linked to fewer cognitive issues with chemo

    Ultrasound and Cilia to Clean Implanted Stents and Catheters

    Ultrasound and Cilia to Clean Implanted Stents and Catheters

    Celebrating Science

    Nobel prize for a New Way in Cancer Treatment

    Nobel prize for New Way in Cancer Treatment

    Simple to use device. Nano Digest.

    Simple to Use Device

    Nanofoam: Breakthrough in Material Design. Nano Digest.

    Nanofoam: Breakthrough in Material Design

    The Future of Solar Energy. Nano Digest.

    The Future of Solar Energy

    Trending Tags

    • 2D nanospace
    • 3D nano structures
    • Bacterial magnetic nanoparticle
    • Creation of nano technology
    • nano particles
    • Nano Technology
    • Nano Tv
    • nanomaterials
    • nanoparticles
    • Nanosciences
    • nanotubes
    • Nanowire
  • Nano TvYouTube
    Nanotechnology in Engineering – NANOENGINEERING | Nano Tv

    Nanotechnology in Engineering – NANOENGINEERING | Nano Tv

    nanotechnology, materials, graphene, nano digest, NanoTV

    Nanotechnology in Materials – GRAPHENE | Nano Tv

    Nanotechnology in Electronics - NANOELECTRONICS | Nano Tv, Nano Digest

    Nanotechnology in Electronics-NANOELECTRONICS | Nano Tv

    Nanotechnology in Medicine - NANOMEDICINE, Nano Tv, nano digest

    Nanotechnology in Medicine-NANOMEDICINE | Nano Tv

    Molecular Nanotechnology-NANOTECHNOLOGY & IMPLEMENTATIONS | Nano Tv, It deals with engineering nanoscale machines that operate on the molecular scale distinct from other areas of nanotechnology, such as nanoscale materials, nano digest

    Molecular Nanotechnology-NANOTECHNOLOGY & IMPLEMENTATIONS | Nano Tv

    What are Nanoparticles?, nano digest

    What are NANOPARTICLES?: Nano Tv

    THE ORIGIN & CHALLENGE by Richard Feynman | Nano Tv

    THE ORIGIN & CHALLENGE by Richard Feynman: Nano Tv

    Introduction, NANOTECHNOLOGY, nano digest, Nano Tv

    Introduction to NANOTECHNOLOGY | Nano Tv

  • ShopSale
No Result
View All Result
Nanodigest
No Result
View All Result
Home Material Science & Technology

Scientists discover new family of quasiparticles in graphene-based materials

by Nano Digest
August 9, 2021
in Material Science & Technology
0
491
SHARES
1.4k
VIEWS
Share on FacebookShare on TwitterShare on Whatsapp

Scientists discover new family of quasiparticles in graphene-based materials

A group of researchers led by Sir Andre Geim and Dr. Alexey Berdyugin at The University of Manchester have discovered and characterized a new family of quasiparticles named ‘Brown-Zak fermions’ in graphene-based superlattices.

The team achieved this breakthrough by aligning the atomic lattice of a graphene layer to that of an insulating boron nitride sheet, dramatically changing the properties of the graphene sheet.

The study follows years of successive advances in graphene-boron nitride superlattices which allowed the observation of a fractal pattern known as the Hofstadter’s butterfly—and today (Friday, November 13) the researchers report another highly surprising behavior of particles in such structures under applied magnetic field.

“It is well known, that in zero magnetic field, electrons move in straight trajectories and if you apply a magnetic field they start to bend and move in circles”, explain Julien Barrier and Dr. Piranavan Kumaravadivel, who carried out the experimental work.

“In a graphene layer which has been aligned with the boron nitride, electrons also start to bend—but if you set the magnetic field at specific values, the electrons move in straight line trajectories again, as if there is no magnetic field anymore!”

“Such behavior is radically different from textbook physics.” adds Dr. Piranavan Kumaravadivel.

“We attribute this fascinating behavior to the formation of novel quasiparticles at high magnetic field,” says Dr. Alexey Berdyugin. “Those quasiparticles have their own unique properties and exceptionally high mobility despite the extremely high magnetic field.”

As published in Nature Communications, the work describes how electrons behave in an ultra-high-quality superlattice of graphene with a revised framework for the fractal features of the Hofstadter’s butterfly. Fundamental improvements in graphene device fabrication and measurement techniques in the past decade have made this work possible.

“The concept of quasiparticles is arguably one of the most important in condensed matter physics and quantum many-body systems. It was introduced by the theoretical physicist Lev Landau in the 1940s to depict collective effects as a ‘one particle excitation’,” explains Julien Barrier “They are used in a number of complex systems to account for many-body effects.”

Until now, the behavior of collective electrons in graphene superlattices were thought in terms of the Dirac fermion, a quasiparticle that has unique properties resembling photons (particles with no mass), that replicate at high magnetic fields. However, this did not account for some experimental features, like the additional degeneracy of the states, nor did it match the finite mass of the quasiparticle in this state.

The authors propose ‘Brown-Zak fermions’ to be the family of quasiparticles existing in superlattices under high magnetic field. This is characterized by a new quantum number that can directly be measured. Interestingly, working at lower temperatures allowed them to lift the degeneracy with exchange interactions at ultra-low temperatures.

“Under the presence of a magnetic field, electrons in graphene start rotating with quantised orbits. For Brown-Zak fermions, we managed to restore a straight trajectory of tens of micrometers under high magnetic fields up to 16T (500,000 times earth’s magnetic field). Under specific conditions, the ballistic quasiparticles feel no effective magnetic field,” explain Dr. Kumaravadivel and Dr. Berdyugin.

In an electronic system, the mobility is defined as the capacity for a particle to travel upon the application of an electrical current. High mobilities have long been the Holy Grail when fabricating 2-D systems such as graphene because such materials would present additional properties (integer and fractional quantum hall effects), and potentially allow the creation of ultra-high frequency transistors, the components at the heart of a computer processor.

“For this study we prepared graphene devices that are extra-large with a very high level of purity”. says Dr. Kumaravadivel. This allowed us to achieve mobilities of several millions of cm²/Vs, which means particles would travel straight across the entire device without scattering. Importantly, this was not only the case for classical Dirac fermions in graphene, but also realized for the Brown-Zak fermions reported in the work.

These Brown-Zak fermions define new metallic states, that are generic to any superlattice system, not just graphene and offers a playground for new condensed matter physics problems in other 2-D material based superlattices.

Julien Barrier added “The findings are important, of course for fundamental studies in electron transport, but we believe that understanding quasiparticles in novel superlattice devices under high magnetic fields can lead to the development of new electronic devices.”

The high mobility means that a transistor made from such a device could operate at higher frequencies, allowing a processor made out of this material to perform more calculations per unit of time, resulting in a faster computer. Applying a magnetic field would usually scale down the mobility and make such a device unusable for certain applications. The high mobilities of Brown-Zak fermions at high magnetic fields open a new perspective for electronic devices operating under extreme conditions.

Tags: graphene
Share196Tweet123Send
Nano Digest

Nano Digest

  • Trending
  • Comments
  • Latest

Nanotechnology in Cancer

September 10, 2020
Emergence of 2.5D Materials for Futuristic Applications

Emergence of 2.5D Materials for Futuristic Applications

June 29, 2022
New research methods developed for nano and quantum materials. Nano Digest.

New research methods developed for nano and quantum materials

February 24, 2023
Designing Gas detecting devices using nanomaterials. Nano Digest.

Designing Gas detecting devices using nanomaterials

2
3D Printing Allows Precise Light Control for Color Composition. nano Digest.

3D Printing Allows Precise Light Control for Color Composition

2

Wearable sensor monitors health, administers drugs using saliva and tears

1
New Printable, Injectable Materials for Advanced Medical Applications

New Printable, Injectable Materials for Advanced Medical Applications

May 29, 2025
Metal fleece: material for the batteries of the future

Metal fleece: material for the batteries of the future

May 24, 2025
AI and X-ray Vision to Gain Insight into Battery Electrolyte.

AI and X-ray Vision to Gain Insight into Battery Electrolyte

May 23, 2025
Nanodigest

Copyright © 2009-2022 NanoDigest.in

Navigate Site

  • About
  • Advertise
  • Privacy Policy
  • Terms & Conditions
  • Contact

Follow Us

No Result
View All Result
  • Home
  • Biological Science & Technology
  • Chemical Science & Technology
  • Material Science & Technology
  • Physical Science & Technology
  • Innovations & Education
  • NanoDigest Exclusive
  • Nano Tv
  • —————————–
  • About
  • Advertise
  • Contact
  • Privacy Policy
  • Terms & Conditions

Copyright © 2009-2022 NanoDigest.in

Welcome Back!

Sign In with Google
OR

Login to your account below

Forgotten Password? Sign Up

Create New Account!

Sign Up with Google
OR

Fill the forms below to register

*By registering into our website, you agree to the Terms & Conditions and Privacy Policy.
All fields are required. Log In

Retrieve your password

Please enter your username or email address to reset your password.

Log In
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
Cookie SettingsAccept All
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT
This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.