February 2013 - BNC-all - ecn.purdue.edu

NCN Seminar: Dr. Jan Mol, “Acceptor based qubits in silicon"
by Anthrop, Heather L 26 Feb '13

26 Feb '13

Acceptor based qubits in silicon Wednesday, March 13, 2013 11:00AM Burton Morgan Building, Room 129 Dr. Jan Mol Centre for Quantum Computation and Communication Technology University of New South Wales, Sydney, Australia Systems with spin-orbit interaction have significant potential for solid-state quantum computation. Coupling between the orbital angular momentum and the spin in the valence band of silicon opens the possibility for rapid all-electrical manipulation of an acceptor-bound spin-orbit state, while selection rules can provide a qubit basis that is protected from decoherence by time-reversal symmetry. Building on the seminal work of Kane, I will present a design for an acceptor-based quantum computer where the transitions between the working levels of the qubit can be switched on and off by manipulating the acceptor wave function. The crucial parameter here is the interface-induced energy splitting between the two Kramers doublets that make up the ground state of the undisturbed acceptor wave function. Based on fully atomistic tight binding simulations and low-temperature scanning tunnelling spectroscopy interface-split Kramers doublets of individual boron acceptors near a silicon surface are visualised and identified. The electron temperature in the sample is used as a reference to directly determine the energy splitting between the Kramers doublets as a function of acceptor depth which is found to be in good agreement with calculations. Finally, the observed energy splitting of ~4 meV effectively protects acceptor-based qubit from decoherence. About the Speaker: After graduating with a Master’s Degree in Applied Physics at the Delft University of Technology in the Netherlands I obtained my PhD Degree in Delft in 2012 studying Single Atom Electronics in the group of Prof. dr. Sven Rogge. During my time as a PhD student I moved to Sydney, Australia where I am currently working as a Postdoctoral Fellow at the Centre for Quantum Computation and Communication Technology at the University of New South Wales. My research focusses on studying single dopant atoms in silicon using Scanning Tunneling Spectroscopy with the emphasis on using dopants as building blocks for quantum computation.

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Hot Chocolate Monday - today at 2p in BRK kitchen
by NSAC 25 Feb '13

25 Feb '13

Dear Birck grad students, staff, and faculty, It's time for Hot Chocolate Monday again. Stop by and chat for a few minutes while drinking some delicious hot chocolate. We hope to see you there! NSAC

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E-news
by Anthrop, Heather L 25 Feb '13

25 Feb '13

Thursday, February 28th Yi Cui Seminar Birck 2001 at 3:30 pm http://www.purdue.edu/discoverypark/nanotechnology/events/view.php?id=1259 Friday, March 1st OSA Purdue Chapter Birck 1001 at 11:00 am Thank you, Heather Anthrop Birck Nanotechnology Center Purdue University 1205 West State Street West Lafayette, IN 47907 (765) 494-7053

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FW: [Physfaculty] Tomorrow's Physics General Colloquium
by Turner, Jaime J 20 Feb '13

20 Feb '13

Physics Special Colloquium Theoretical AMO Physics Candidate: Andreas Becker, JILA Colorado University Boulder and NIST Thursday, February 21, 2013 4:00 P.M. - 5:00 P.M. PHYS room 203 [cid:image002.png@01CE0F6A.2DBA30D0]Refreshments at 3:30 P.M. in PHYS room 242 [Andreas Becker]<http://jila.colorado.edu/sites/default/files/andreas_becker_1.jpg> Tracing Electron Dynamics on the Attosecond Time Scale In the past time-resolved experiments and theoretical analysis explored molecular rotation and vibration as well as chemical reactions on the time scale of atomic motion. Recent advances in laser science led to the development of attosecond laser pulses (1 atomic unit = 24 attoseconds) which can uncover new insights in the electron dynamics in atoms and molecules on its natural time scale. I will present physical concepts behind attosecond laser technology and measurements. In particular, I will then discuss ongoing theoretical and experimental efforts to monitor and control the dynamics of an electron in the chemical bond of a molecule, using nature's most simplest molecule as an example.

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Gentle reminder
by Totten, Mary J 19 Feb '13

19 Feb '13

Everyone, Just a gentle reminder to make sure you are using the kitchen sink to wash any dishes or dispose of left over drinks, ice, or coffee grounds. Please do not use the bathroom sinks or water fountains to rinse out dishes and drink containers. We have had problems with our drains being clogged up with food and coffee grounds. Please let me know if you have any questions and thank you in advance for helping keep Birck a great place to work. Thank you, Mary Jo Totten Birck Nanotechnology Center Discovery Park/Purdue University 1205 West State Street West Lafayette, IN 47907-2057 (765) 496-1173 Our attitude toward life determines life's attitude towards us. - John N. Mitchell

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Hot Chocolate Monday: today at 2pm in BRK kitchen
by NSAC 18 Feb '13

18 Feb '13

Dear Birck grad students, staff, and faculty, It's time for Hot Chocolate Monday again. Stop by and chat for a few minutes while drinking some delicious hot chocolate. We hope to see you there! NSAC

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BNC e-news
by Anthrop, Heather L 15 Feb '13

15 Feb '13

Monday, February 18th Prof. Charles Monroe "Science Fiction to Reality in Metal casting Processing" ARMS 1010 at 3:45 pm http://www.uab.edu/metals/ Tuesday, February 19th Dr. Robert Klitzman "Am I My Genes?: Confronting Fate and Family Secrets in the Age of Genetic Testing" LWSN 1142 5:30 - 7:00 pm http://www.purdue.edu/discoverypark/bioethics/events/view.php?id=1014 Thursday, February 21st IP Law 201 Faculty and Student Inventors: Beyond the Basics MRGN 121 1:00 - 2:00 pm Friday, February 22nd OSA-Purdue Chapter Meeting Birck 1001 11:00 am Thank you, Heather Anthrop Birck Nanotechnology Center Purdue University 1205 West State Street West Lafayette, IN 47907 (765) 494-7053

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Laptop
by Anthrop, Heather L 15 Feb '13

15 Feb '13

To whomever borrowed the Birck laptop on Tuesday, please return it as soon as possible. Thank you, Heather Anthrop Birck Nanotechnology Center Purdue University 1205 West State Street West Lafayette, IN 47907 (765) 494-7053

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Physics General Colloquium - Prof. Ali Shakouri - Feb. 14th at 4pm in PHYS 203
by Turner, Jaime J 13 Feb '13

13 Feb '13

Dear all, Thursday, Feb. 14th at 4:00pm in PHYS 203 Prof. Ali Shakouri will give the Physics General Colloquium. Please find attached the seminar announcement. Ali Shakouri Purdue University Physics General Colloquium Thursday, February 14th PHYS 203 at 4:00 pm Refreshments in PHYS 242 at 3:30pm Nanoscale electrothermal energy transport Energy consumption in our society is increasing rapidly. More than 85% of the available energy is lost in the form of heat. In this talk we review the potential of thermoelectric devices that allow direct conversion of heat into electricity. Novel metal-semiconductor nanocomposites are developed where the heat and charge transport are modified at the atomic level [1]. Potential to increase the energy conversion efficiency and lower the cost will be discussed. We also describe how similar principles can be used to make high speed micro refrigerators on a chip. Thermoreflectance imaging is used to study Peltier cooling and Joule heating in devices with 800ps time and submicron spatial resolution. The ballistic heat conduction and the transition between energy and entropy transport in ultra short times and in thin film devices will be discussed. Finally a brief overview of new research initiatives at the Birck center will be presented. [1] A. Shakouri, "Recent developments in semiconductor thermoelectric physics and materials," Annual Review of Materials Research, July 2011.

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Hot Chocolate Monday: today at 2pm in BRK kitchen
by NSAC 11 Feb '13

11 Feb '13

Dear Birck grad students, staff, and faculty, It's time for Hot Chocolate Monday again. Avoid the cold wind outside, and instead come relax and chat for a few minutes while drinking some delicious hot chocolate. We hope to see you there! NSAC

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