Biesinger Daniel, Scheller Christian, Braunecker Bernd, Zimmerman Jeramy, Gossard Arthur, Zumbuhl Dominik (2015), Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot, in Physical Review Letters
, 115, 106804.
Feshchenko A. V., Casparis L., Khaymovich I. M., Maradan D., Saira O.-P., Palma M., Meschke M., Pekola J. P., Zumbühl D. M. (2015), Tunnel-Junction Thermometry Down to Millikelvin Temperatures, in Phys. Rev. Applied
, 4, 034001-034001.
Maradan D., Casparis L., Liu T.-M., Biesinger D. E. F., Scheller C. P., Zumbühl D. M., Zimmerman J. D., Gossard A. C. (2014), GaAs Quantum Dot Thermometry Using Direct Transport and Charge Sensing, in Journal of Low Temperature Physics
, 175, 784.
Dettwiler F., Fallahi P., Scholz D., Reiger E., Schuh D., Badolato A., Wegscheider W., Zumbühl D. M. (2014), Hybrid Quantum Dot-2D Electron Gas Devices for Coherent Optoelectronics, in arxiv
, 1403, 7775.
C. P. Scheller, T.-M. Liu, G. Barak, A. Yacoby, L. N. Pfeiffer, K. W. West, D. M. Zumbuhl (2014), Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires, in Phys. Rev. Lett.
, 112, 066801.
Scheller C. P., Heizmann S., Bedner K., Giss D., Meschke M., Zumbühl D. M., Zimmerman J. D., Gossard A. C. (2014), Silver-Epoxy Microwave Filters and Thermalizers for Millikelvin Experiments, in Applied Physics Letters
, 104, 211106.
Scheller C. P., Braunecker B., Loss D., Zumbühl D. (2014), Spontaneous Helical Order of Electron and Nuclear Spins in a Luttinger Liquid, in SPS Progress in Physics
, 44, 23-28.
L. Casparis, D. Hug, D. Kölbl, D. M. Zumbuhl (2013), Evidence for Disorder Induced Delocalization in Graphite, in arXiv (under review)
, 1301, 2727.
D. Kölbl, D. M. Zumbühl (2013), Transport spectroscopy of disordered graphene quantum dots etched into a single graphene flake, in arXiv
, 1307, 8163.
Koelbl D, Zumbuhl DM, Fuhrer A, Salis G, Alvarado SF (2012), Breakdown of the Korringa Law of Nuclear Spin Relaxation in Metallic GaAs, in Phys. Rev. Lett.
, 109, 086601-4.
Casparis L, Meschke M, Maradan D, Clark AC, Scheller C, Schwarzwaelder KK, Pekola JP, Zumbuhl DM (2012), Metallic Coulomb Blockade Thermometry down to 10 mK and below, in Rev. Sci. Instr.
, 83, 083903-4.
Macroscopic control of coherent quantum states is a major theme in much of modern physics because quantum coherence enables study of fundamental physics and has promising applications for quantum information processing. The potential significance of quantum computing is now widely recognized, in the physics community and beyond. Thisproposal consists of three projects: nuclear spin magnetism in GaAs quantum wires, spin-orbit coupling and the persistent spin helix in GaAs 2D electron gases and single electron spin relaxation physics.The coherence in electron spin qubits is known to be limited by the fluctuations of the nuclear spin ensemble. These fluctuations can be fully suppressed and coherence strongly enhanced if the nuclear spin system is in a ferromagnetically ordered state. As recently proposed by theorists, a correlated state of matter with full nuclear order is induced by an effective RKKY interaction mediated by the interacting 2D electron gas, with rich newphysics worth studying in its own right. In 1D systems, due to very strong electron-electron interactions, the ordering temperature is an experimentally easily accessible range, around Tc = 80 mK for nuclear order in 1D GaAs cleaved edge overgrowth quantum wires (project A) at external B=0. The nuclear order is manifestly visible in quantum transport through a suppression of the wire conductance from 2e2/h down to 1e2/h at low temperatures T<