Thank you for your support this last month! Let us know what we should do for the next 12:

From: Team Joe <info>
Date: Sun, Jun 2, 2019 at 10:44 PM
Subject: Thank you for your support this last month! Let us know what we should do for the next 12:
To: ajay mishra <ajayinsead03>

Will you take a moment to share some feedback with the team?

‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌
ajay, we say this in campaign headquarters all the time: Our supporters are incredible. Thanks to you all, we reached our May goal and are going into June with the resources and grassroots support we need to be successful.

You all are the backbone of your communities.You use your voices to speak up and speak out. I know the value of your hard-earned dollars, which is why we want you to know how much it means to us when you choose to use them in support of our campaign.

It’s a great honor to be in this with you, and we want to keep making you proud. Will you take a moment to share some feedback with our team? We have a few questions you can answer by clicking here »

In the first full month of our campaign Joe has gotten to meet a lot of people and shake a lot of hands.

20190528_aft-cropped.jpg Joe’s whole career has been about trying to stand up and fight for working families, the middle class, women, LGBTQ individuals, and people of color. We all need to be able to count on one another to get through the tough times. That’s the kind of administration we want to bring back to the White House.

We have the first debate coming up this month. So tell us, ajay, what issue is most important to you? How can our team address the topics that matter most to you?

We want our campaign to have these answers from you, ajay. Can you fill out our survey? We want these answers going into our first debate.

FILL OUT QUICK QUESTIONNAIRE »

Thanks again for a great month, ajay, and we look forward to reading these answers.

Team Joe

ajayinsead03. If you would like to receive fewer emails, click here. If you would like to unsubscribe, click here.

ajay, thank you so much for supporting Joe Biden’s Presidential campaign.

Change occurs because the conscience of a country begins to rise up and demand — demand change.

This isn’t the time to be complacent. If you are ready to fight for the soul of this nation, you can start by donating to elect Joe Biden by clicking the button below.

DONATE TO ELECT JOE BIDEN →

We know we send a lot of emails, and we are sorry about that. The reason? We are relying on grassroots supporters like you (we’re serious!).

But ajay, we don’t want to bother you. If you’d like to only receive our most important emails, click here. If you’d like to unsubscribe from our emails, you can click here.

We sincerely thank you for your help and support.
– The entire Joe Biden for President team

Paid for by Biden for President

open.gif

SCIENCE IIT Madras develops material with properties suitable for quantum optoelectronics Shubashree Desikan JUN E 01, 2019 16:23 IST UPDATED: JUNE 01, 2019 16:24 IST SHARE ARTICLE 0 PRINT A A A The most challenging aspect was the co ntrolled photoluminescence measurement from room temperature down to 100 K. The most challenging aspect was the controll ed photoluminescence measurement from room temperature down to 100 K. Drop-casting gold nanoparticles on tungsten disele nide effectively ‘brightens’ the ‘dark excitons’ Materials such as tungsten diselenide (WSe2) and molybdenum dis elenide are being studied keenly for their opto-electronic properties – a combination of optics and electronics. A key property of these materials is photoluminescence, in which the material absorbs light and re-emits it as a spectrum. Re searchers from IIT Madras have found a way of enhancing this property about 30 times in tungsten diselenide, by drop-cas ting gold nanoparticles on to a two-dimen

SCIENCE

IIT Madras develops material with properties suitable for quantum optoelectronics

Shubashree DesikanJUNE 01, 2019 16:23 ISTUPDATED: JUNE 01, 2019 16:24 IST

The most challenging aspect was the controlled photoluminescence measurement from room temperature down to 100 K.

The most challenging aspect was the controlled photoluminescence measurement from room temperature down to 100 K.

Drop-casting gold nanoparticles on tungsten diselenide effectively ‘brightens’ the ‘dark excitons’

Materials such as tungsten diselenide (WSe2) and molybdenum diselenide are being studied keenly for their opto-electronic properties – a combination of optics and electronics. A key property of these materials is photoluminescence, in which the material absorbs light and re-emits it as a spectrum. Researchers from IIT Madras have found a way of enhancing this property about 30 times in tungsten diselenide, by drop-casting gold nanoparticles on to a two-dimensional film. The work is published in Applied Physics Letters.

Two-dimensional material

Consisting of practically one layer of atoms, these materials are two-dimensional in structure. Photoluminescence properties can be used in various devices such as quantum LEDs which can be used in communication and computation. “The most challenging aspect of this study was the controlled photoluminescence measurement of these materials from room temperature to 100 K,” says Pramoda Kumar Nayak, a DST Ramanujan Fellow at the Department of Physics of IIT Madras and an author of the paper.

As is well known, electrons in semiconductors occupy bands of energy known as valence bands. As long as they live in these bands, they do not move and contribute to conduction. If excited by a small energy input, they get kicked into what is called the conduction band where they can actually be delocalised and contribute to the conduction by moving around.

Excitons

When an electron jumps from the valence to the conduction band, it leaves behind a shadow called a “hole.” The electron in the conduction band and the hole in the valence band can bind together and form a composite object ( or pseudoparticle) known as an exciton. Photoluminescence in tungsten selenide is a result of such excitons.

There can be two ways in which an exciton can form – when the spins of the component electron and hole are opposite to each other and when they are aligned in teh same direction. The former is called a bright exciton and the latter, a dark exciton. Because their spins are opposite, the electron and hole forming the bright exciton can recombine, giving out a quantum of light in the process. Such a simple way of recombining does not exist for the dark excitons. Since there, the spin of the electron and the hole are parallel, their recombination is discouraged by the rule of conservation of angular momentum. Hence the dark excitons are longer lived than the bright excitons. The dark excitons need an external influence to help them recombine. In their work, the IIT Madras researchers find exactly such an external influence.

Power of gold

When they drop-cast gold nanoparticles on the surface of the monolayer tungsten diselenide, they find that the dark excitons couple to the surface fields generated and recombine to give off light quanta. Thus, the dark excitons are “brightened” with the help of the gold nanoparticles.

“That plasmonic effect arises due to gold nanoparticles is a well known concept. But, its application to 2D systems is in nascent stage. So, I thought that if we drop-cast gold nanoparticles onto monolayer WSe2, then it will generate out-of-plane electric field due to plasmonic effect, which can help for spin-flip of conduction band electrons, thereby making dark excitons bright,” says Dr Nayak.

Thanks in Advance,
Sincerely
Ajay