star one newsletter summer 2018 › pdfs › newsletter-summer-2018.pdf · spring terms – for...

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Loss spectroscopy of molecular solids: combining experiment and theory Friedrich Roth 1,2 , Pierluigi Cudazzo 3,4 , Benjamin Mahns 1 , Matteo Gatti 3,4,5 , Johannes Bauer 1 , Silke Hampel 1 , Markus Nohr 1 , Helmuth Berger 6 , Martin Knupfer 1 and Angel Rubio 3,4,7 1 IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany 2 Center for Free-Electron Laser Science / DESY, Notkestraße 85, D-22607 Hamburg, Germany 3 Nano-Bio Spectroscopy group, Dpto. F´ ısica de Materiales, Universidad del Pa´ ıs Vasco, Centro de F´ ısica de Materiales CSIC-UPV/EHU-MPC and DIPC, Av. Tolosa 72, E-20018 San Sebasti´ an, Spain 4 European Theoretical Spectroscopy Facility (ETSF) 5 Laboratoire des Solides Irradi´ es, ´ Ecole Polytechnique, CNRS-CEA/DSM, F-91128 Palaiseau, France 6 Institute of Physics of Complex Matter, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland 7 Fritz-Haber-Institut der Max-Planck-Gesellschaft, Theory Department, Faradayweg 4-6, D-14195 Berlin-Dahlem, Germany E-mail: [email protected],[email protected],[email protected] Abstract. The nature of the lowest-energy electronic excitations in prototypical molecular solids is studied here in detail by combining electron energy loss (EELS) experiments and state-of-the-art many-body calculations based on the Bethe-Salpeter equation. From a detailed comparison of the spectra in picene, coronene and tetracene we conclude that the agreement between theory and experiment is very good. We focus on the anisotropy of the spectra, which illustrates the complexity of this class of materials, showing a high sensitivity with respect to the three-dimensional packing of the molecular units in the crystal. The differences between the measured and the calculated spectra are explained in terms of the small differences between the crystal structures of the measured samples and the structural model used in the calculations. Finally, we discuss the role played by the different electron-hole interactions in the spectra. We thus demonstrate that the combination of highly accurate experimental EELS and theoretical analysis is a powerful tool to elucidate and understand the electronic properties of molecular solids.

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Page 1: Star One Newsletter Summer 2018 › pdfs › newsletter-summer-2018.pdf · spring terms – for summer term, you may be enrolled less than half-time ... Star One Newsletter Summer

www.starone.org | 866.543.5202 | Summer 2018

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On Next Page: Holiday Schedule

Star One Student Loans and Refinance OptionsEven if your college student receives scholarships, grants and federal student loans, it may not be enough to cover all higher education expenses. But you can fill the gaps in your financial aid coverage with a student loan through Star One Credit Union.

As a not-for-profit credit union and a partner of the Credit Union Student Choice Program (CUSC), Star One offers great student loans to members like you. Our Student Choice private loan solution is designed to fill the funding gaps that may exist after all lower-cost sources of aid (including scholarships, grants, and federal direct subsidized and unsubsidized loans) have been exhausted.

Convenient Line of CreditOur student loans function as a one-time line of credit (LOC) of up to $75,000 for undergraduate students and up to $100,000 for graduate business school students – the exact amount will be based on the remaining cost of your education. You can draw up to a school-certified amount from the LOC, at a minimum of $1,000 per year. Funds are given to your school based on its disbursement cycle.

Competitive Rates Undergraduate loans with rates as low as

6.00% APR* Graduate business school loans with rates

as low as 5.25% APR*

What Our Loans OfferFeatures of our student loans include: 24/7 call center and application support Deferment of principal and interest while

in school Flexible repayment terms Zero origination, prepayment or other

application fees

Are You Eligible?To qualify for a Star One student loan, you must be: A U.S. citizen or permanent resident Attending an approved school** Continually enrolled in a degree-granting

program Meeting your school’s minimum Satisfactory

Academic Progress (SAP) criteria Enrolled at least half-time for fall and

spring terms – for summer term, you may be enrolled less than half-time

Able to pass a credit check (a co-signer may be necessary)

Eligible for credit union membership

Student Loan RefinanceWhen it’s time to repay student loans, Star One can help you refinance and consolidate private and federal student loans (including PLUS loans) into one manageable, convenient payment that could also lower your rate.***

Congratulations, Star One Scholarship Winners!

Star One Credit Union was pleased to award six students with scholarships in April. Each recipient was awarded $2,000.

Scholarship applications for the 2019 school year will be available at www.starone.org in early 2019. Star One will be awarding ten $5,000 scholarships in 2019. Watch for more information to come!

Learn MoreWe’re here to help! Visit the Student Loans page under Mortgages & Other Loans at www.starone.org for additional information.

* Your APR based on credit qualification. Floor 5% for undergraduate and graduate programs. Cap 18.00% applies to all student loans. Rates shown include a 0.25% discount for optional enrollment in automatic electronic payments. Rates as of June 21, 2018, subject to change. 25-year term available for loans equal to or greater than $40,000.

** Approved schools subject to change.*** Subject to credit qualification and additional criteria,

including graduating from an approved school.

Page 2: Star One Newsletter Summer 2018 › pdfs › newsletter-summer-2018.pdf · spring terms – for summer term, you may be enrolled less than half-time ... Star One Newsletter Summer

Star One Phone Representatives(408) 543-5202 or(866) 543-5202 toll freeFax: (408) 543-5203 Star One Phone Representatives are available Mon. – Fri., 7 a.m. – 7 p.m. and on weekends and most holidays from 9 a.m. – 5 p.m. For your convenience, we use a Shared Branch call center to handle after-hours calls. They can assist you with general questions and basic transactions.

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The articles and information in this publication are for general information only and are not intended to provide specific advice or recommendations for any individual or company. Although intended to be accurate, neither the publisher nor any other party assumes liability for loss or damage due to reliance on this material. Websites not belonging to this organization are provided for information only. No endorsement is implied. Images may be from ©iStock and/or ©Fotolia.

©2018 Star One Credit Union.

Holiday Schedule Star One branches will be closed to observe:

Independence Day – July 4Labor Day – September 3Columbus Day – October 8

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As a Star One Credit Union member, you belong to one of the best credit unions in the nation. At Star One, we focus on helping you improve your life by giving you more. In doing so, we’re pleased to receive many recognitions from independent financial rating organizations. Below are a few examples. Visit www.starone.org for details.

Share the Benefits of Star One Membership

Recognitions of Excellence

Star One Credit Union received the Member Benefits Top Performance Award for the fifth consecutive year from the Credit Union National Association (CUNA). Star One ranked first among credit unions nationwide in providing its members the highest average financial benefits by charging less for loans, paying more

on deposits, and charging fewer or lower fees. According to CUNA’s most recent analysis, Star One’s average benefits per member household amounted to $1,832. These benefits are calculated as averages, loyal members who use the credit union extensively often receive total financial benefits that are much greater than these averages.

Bauer Financial, Inc., the nation’s leading independent bank and credit union rating and research firm, recognized Star One as “Superior,” their highest rating, for over 108 consecutive quarters.

Star One received the highest financial rating of A+ by Weiss Ratings. Weiss Ratings’ empowers consumers, professionals and institutions with high-quality advisory information for selecting or monitoring a financial services company or financial investment.

A+

SUPERIOR

#1

Do you have family and friends who are not members? Invite them to join Star One! Star One offers membership to individuals who live, work or attend school in Santa Clara County, to employees of corporate sponsors, and immediate family members of current Star One members.

Let them know they’ll find excellent service and great rates here. They can join the Credit Union today by opening a Money Market Savings account with a minimum deposit of only $50.

Visit www.starone.org to learn more about membership eligibility and benefits.

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