November 2016 - BNC-all - ecn.purdue.edu

REVISED TIME: Prof. Ying Diao Seminar, Thurs., Dec. 1st at 1:45pm in BRK 1001
by Turner, Jaime J 30 Nov '16

30 Nov '16

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Reminder: Business office closed
by Anthrop, Heather L 30 Nov '16

30 Nov '16

As a reminder the Business Office will be closed all day, Friday, December 2nd. Erica will be checking her email regularly and will approve Ariba orders at the end of the day. If you need to place a credit card order it must be done by Thursday, December 1st or it will have to wait until Monday, December 5th. If you have any questions or concerns please see Erica Cox.

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Seminar: Rajib Rahman, Prospective ECE Assistant Research Faculty, Thursday, Dec. 1, 9:30am, WANG 1004
by Anthrop, Heather L 29 Nov '16

29 Nov '16

SEMINAR Thursday, December 1, 2016 9:30 am ROOM WANG 1004 Valley Dependent g-factors in Silicon: Role of Spin-Orbit and Micromagnets Dr. Rajib Rahman Network for Computational Nanotechnology, Purdue University Abstract: Spin quantum bits hosted in silicon quantum dots are attractive due to their exceptionally long coherence times and compatibility with the silicon transistor platform. How such microscopic electronic spins are affected by the crystal and interfacial symmetries has been a topic of great interest over the past few decades and has found potential applications in spin based electronics and computation. While the coupling between spin and orbital degrees of freedom has been extensively studied, the interplay between spin and the momentum space valley degree of freedom is a topic of recent interest, and may enable hybrid spin- and valley-tronic devices. In this talk, I will describe recent experiments that have probed valley dependent spin properties in silicon quantum bits. I will present an atomistic modeling framework that can provide a unified description of disparate experimental measurements, and show how material and device properties combine to affect the spins. I will show that spin splittings in silicon quantum dots are inherently valley-dependent. Interface disorder, such as monoatomic steps, can strongly affect the intrinsic spin-orbit coupling and can cause device-to-device variations in g-factors. I will also describe the anisotropy of the g-factor as a function of the angle of an external magnetic field and compare with recent experimental measurements. I will also show how the anisotropy is affected by integrated micromagnets in silicon qubits that can generate an extrinsic coupling between spin and charge. Finally, I will show how the intrinsic and extrinsic factors affecting the spins can be used to perform electrical rotations of spin qubits. Bio: Rajib Rahman obtained his PhD degree in Electrical and Computer Engineering from Purdue University in 2009 in the area of computational nanoelectronics. He was a postdoctoral fellow in Sandia National Laboratories in the Silicon Quantum Information Science and Technology group from 2009-2012. Since 2012, he has been employed as a Research Assistant Professor in the Network for Computational Nanotechnology (NCN) at Purdue. Rajib develops and employs atomistic simulation methods to model electronic devices at the nanoscale including quantum dots, photo-detectors, spin qubits, and transistors. Rajib specializes in the quantum mechanical many-body description of spins and their interactions with the solid-state environment. He collaborates with leading experimental groups in academia and in national laboratories in the field of semiconductor quantum computing.

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Prof. Ying Diao Seminar, Thurs., Dec. 1st at 1:30pm in BRK 1001
by Turner, Jaime J 28 Nov '16

28 Nov '16

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MORE INFO: Notification of Scheduled Data Network Outage for Campus IPv6 Clients (Research/Data Center NOT Affected!) -- ITaP Change Management RFC #7388
by Totten, Mary J 28 Nov '16

28 Nov '16

From: Kyburz, Duane E. Sent: Tuesday, November 22, 2016 3:34 PM To: Kyburz, Duane E. <storm(a)purdue.edu> Subject: MORE INFO: Notification of Scheduled Data Network Outage for Campus IPv6 Clients (Research/Data Center NOT Affected!) -- ITaP Change Management RFC #7388 Importance: High Please note that the date/time was accidentally left out of the message below. This work is scheduled to take place from 11/30/16, 11:00 PM to 12/01/16, 1:00 AM. Duane =============================== Duane Kyburz, Network Engineer Purdue University - ITaP, IT Infrastructure Services Data Networks Team Office: 765-496-8226 Mobile: 765-490-4755 Fax: 765-494-6620 Email: storm(a)purdue.edu<mailto:storm@purdue.edu> =============================== From: Kyburz, Duane E. Sent: Tuesday, November 22, 2016 3:29 PM To: Kyburz, Duane E. <storm(a)purdue.edu<mailto:storm@purdue.edu>> Subject: Notification of Scheduled Data Network Outage for Campus IPv6 Clients (Research/Data Center NOT Affected!) -- ITaP Change Management RFC #7388 Importance: High WORK TO BE PERFORMED: The ITaP Data Networks Team will be performing work that will cause a disruption of data network services for some clients. AFFECTED CLIENTS: All campus network clients who are utilizing IPv6 (versus IPv4) network space. Note that this work will not impact data center or research clients/services. SCOPE OF WORK: Sometime during the scheduled work window, affected client(s) should plan to experience 2 service disruptions, each lasting up to 15 minutes in duration. If you have any questions or concerns about this work please don't hesitate to let us know. Thanks much. Duane =============================== Duane Kyburz, Network Engineer Purdue University - ITaP, IT Infrastructure Services Data Networks Team Office: 765-496-8226 Mobile: 765-490-4755 Fax: 765-494-6620 Email: storm(a)purdue.edu<mailto:storm@purdue.edu> ===============================

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Missing Step Stool
by Totten, Mary J 18 Nov '16

18 Nov '16

Everyone, Mailroom is missing our step stool. It is a 3 step fold up kind with a label on it for the mail room. Could you please return it to BRK 1220? Thank you, Mary Jo Totten Birck Nanotechnology Center Discovery Park/Purdue University 1205 West State Street BRK 1220 West Lafayette, IN 47907-2057 (765) 496-1173 Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time. Thomas A. Edison

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BNC E-news for the week of November 21st
by Anthrop, Heather L 18 Nov '16

18 Nov '16

iLab Purdue Closed Refrigerator iLab Dear All Birck researchers/users, We’re happy to report that we are well underway with implementation of a new equipment scheduling/reservation system at Birck Nanotechnology. iLab Solutions is providing the new reservation system with a much improved and more intuitive user interface. iLab will be accessible from any device with a web browser, even your cell phone! Our current system, Coral, is being retired due to lack of ongoing support and other limitations. Beyond the improved user experience the iLab Solution offers many advantages on the back end as well, a few of those are listed below. • The registration process to use iLab is online, and students can register themselves without the need to have the PI submit the request. PI’s or their delegates will still need to approve the students use of their accounts but no more waiting on the current manual processing system! • Users can submit training requests directly on the system and will no longer need to track down the correct staff to request this training. Staff will see the request and coordinate the scheduling as appropriate. • For those users that require split billing for equipment usage, you will be able to manage this at the time of use instead of after the billing has been sent for review. • The system is flexible enough that we can post links and resources for each system so that information is easy to find and readily available, you can expect more of this after go-live! • iLab integrates with Purdue’s existing SAP system (accounting) and should nearly eliminate billing errors. As we approach the transition from Coral to iLab we would like to make you aware of a few things. First, our facility is large with so many great research tools that it wasn’t possible to shift the entire building on one single date. Our rollout plan has about half of our equipment migrating to iLab in December and the remaining equipment in January. Therefore we will be operating both systems for a month which may cause some confusion, we will try to make it apparent which tools have migrated. Along with signage, the current plan is to have those systems that will be migrated to iLab shutdown in Coral on go live day. On the shutdown messages in Coral there will be a note stating that the tool has been moved into iLab to direct users to the new system. The staff will also try to migrate the reservations made past that date to the new system if possible (that will require that you have already registered for iLab and have been approved by your PI, more on that below). After the second go live in January, Coral will be taken offline and will become unavailable. You can register for iLab now! It is better to be proactive so you don’t experience any downtime on your research waiting on account approvals. All PI s have been uploaded to the system already, so you can go ahead and register with iLab and start your approval process today! Register at the following link: https://purdue.ilabsolutions.com/ Select the Click here option as an Internal Purdue User at the top right. You will be taken to a secure Purdue page to enter you career account alias and password. You will then be redirected to an iLab sight to complete registration. There you will be asked a couple of questions and will need to identify your PI. Once you submit that registration your PI will need to approve you as his/her student. Once you have access to iLab, feel free to get in there and look around! Purdue has many cores live already that you can view. Many other institutions are using iLab and you can view their sites as well! As we begin this roll-out please contact me or other engineering staff members if you have questions. Thank you, Jerry Shepard Birck Research Engineer Phone: 765-494-3480 Purdue University will be closed Thursday, November 24th and Friday, November 25th in observance of the Thanksgiving holiday. Monday November 21 Fridge Clean Out at 2:00 PM Label with name and date. Labels on the fridge. I will trash container and all if I think it looks old and has no label. Questions - Contact Nancy

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My final Exam (Thursday Nov, 17 BRK 2001 , 9am) : Amr Mohammed
by Amr Mohammed Shahat Mohammed 16 Nov '16

16 Nov '16

Dear All I would like to invite you to my final exam tomorrow 9:00AM (BRK2001). My thesis title is : Nanoscale Thermal and Electrothermal Transport: Lévy Flights and Percolation Networks Refreshments will be served. Best, Amr Mohammed ***************************** Thesis abstract: Huge development in the synthesis and processing of materials with nanostructures on nanometer length scales has created a demand for a deeper understanding of thermal and electro-thermal transport in nanoscale devices and nanostructured materials. Besides, heterogeneity of nanocomposite materials and devices has brought the need to assess the validity of conventional theories of transport and/or develop new theories for these devices. First, considering the problem of heat transfer, it is surprising that the theory we use dates back to Joseph Fourier, and he developed it to explain how the temperature of the Earth changes. However, we still use the same theory at the smallest size scale; say tens of nanometers, and the fastest time scale of hundreds of picoseconds. Developing models that account accurately for ballistic heat transport becomes essential to enable innovative device designs for thermoelectrics as well as ultrafast thermal management of high power electronics and optoelectronics. This can also be used for advanced phonon spectroscopy. A new model based on Truncated Lévy (TL) flight is introduced to describe the phonon random walk. We can extract the fractal diffusion exponent for several alloys as evidence for anomalous diffusion (superdiffusion) at early times. This approach captures the ballistic heat transport at early time/ short length scales. The truncation at a characteristic length/time to converge to normal diffusion is necessary for consistency with bulk solution. Finally, developing new materials with engineered non-diffusive heat transport is investigated. In analogy with light superdiffusion in Levy glass, we studied heat transport in semiconductors alloys with different embedded nanoparticles concentration. It is shown theoretically and experimentally that, even when the volume concentration of embedded nanoparticles changes by two orders of magnitude, the fractal exponent of heat superdiffusion remains constant. In a second example, we use Monte Carlo Boltzmann transport equation to simulate heat transport in non-periodic multilayer structure with power-law layer thickness distribution. The idea is to introduce fractal structure with high thermal conductivity contrast between the host material and island material through which one can tune the phonon jump length distribution. The heterogeneity of nanocomposite devices can give rise to anomalous transport behavior even in steady state. The technological importance of 2D materials (e.g., graphene, carbon nanotube (CNT) network, MoS2) has encouraged fundamental exploration into the electro-thermal properties of these systems. In this work, we use ultra-high resolution thermo-reflectance imaging to map the spatial distribution of temperature rise due to self-heating in two types of 2D transparent electrodes (percolating and co-percolating networks). We experimentally demonstrate a spatially-resolved, reversible nonlinear electro-thermal percolation transport in network structures. A novel algorithm for temperature data extraction is proposed using a binary masking algorithm, followed by quantitative statistical data analysis of self-heating of nanowire networks. We establish a universal scaling function (Weibull) that describes the nonlinear percolation transport for network structures. A phenomenological model is also proposed providing interesting insights regarding both experimental and theoretical studies of nonlinear percolation transport in the networks.

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Spintroincs Preeminent Team Faculty Seminar - Weigang Wang, Nov. 21st @ 9am in MSEE 239
by Turner, Jaime J 16 Nov '16

16 Nov '16

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Ganesh Balakrishnan Seminar Thurs Nov 17 3:30 PM BRK 1001
by Black, Nancy Lee 15 Nov '16

15 Nov '16

Speaker: Ganesh Balakrishnan - Associate Professor and Regents' Lecturer in the Department of Electrical and Computer Engineering and the Center for High Technology Materials (CHTM) at the University of New Mexico Title: Metamorphic Antimonide Near-Infrared Sub-Cells for Multi-Junction Solar Cells Where: Birck Rm. 1001 When: November 17 (Thurs.) 3:30 p.m Refreshments will be served. Host: Peter Bermel Nancy Black Secretary V Birck Nanotechnology Center West Lafayette, IN 47907-2057 Phone: 765-494-8675 Fax: 765-494-4731

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