Hanhee Paik  Hanhee Paik photo         

contact information

Senior Research Scientist, IBM Quantum
Thomas J. Watson Research Center, Yorktown Heights, NY USA
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2022

Challenges and Directions of Quantum Computing with Superconducting Qubits
Hanhee Paik
APS March Meeting Abstracts, pp. M28--003, 2022

Ultrahigh-Q on-chip silicon--germanium microresonators
Ryan Schilling, Chi Xiong, Swetha Kamlapurkar, Abram Falk, Nathan Marchack, Stephen Bedell, Richard Haight, Christopher Scerbo, Hanhee Paik, Jason S Orcutt
Optica 9(3), 284--287, Optica Publishing Group, 2022

Optimization of the resonator-induced phase gate for superconducting qubits
Moein Malekakhlagh, William Shanks, Hanhee Paik
Physical Review A 105(2), 022607, American Physical Society, 2022


2021

Materials challenges and opportunities for quantum computing hardware
Nathalie P de Leon, Kohei M Itoh, Dohun Kim, Karan K Mehta, Tracy E Northup, Hanhee Paik, BS Palmer, Nitin Samarth, Sorawis Sangtawesin, David W Steuerman
Science 372(6539), eabb2823, American Association for the Advancement of Science, 2021


2019

Quanten-Kommunikationsverbindung, die gegenuber Photonenverlust robust ist
Bishop Lev Samuel, Gambetta Jay, Paik Hanhee
2019
Abstract   physics, humanities

Black-Box Superconducting Circuit Quantization (In Russian)
Simon E. Nigg, Hanhee Paik, Brian Vlastakis...
viXra, 2019
Abstract   superconductivity, quantum mechanics, quantum, quantization, quantization, physics, mesoscopic physics, linear response function, josephson effect, hamiltonian

Coupler characterization of transmons for cross-resonance
Hanhee Paik, Jose Chavez-Garcia, Martin Sandberg, Oblesh Jinka, Jeng-Bang Yau, Dongbing Shao, Firat Solgun, Markus Brink, Jerry Chow
Bulletin of the American Physical Society, 2019
resonance, physics, nuclear magnetic resonance

Low temperature measurement of SiGe properties for superconducting quantum circuits
Martin Sandberg, Markus Brink, Vivekananda Adiga, Jose Chavez-Garcia, Jerry Chow, Hanhee Paik, Jason Orcutt
Bulletin of the American Physical Society, 2019
temperature measurement, superconductivity, quantum, optoelectronics, materials science, electronic circuit

Enablement of near-term quantum processors by architectural yield engineering
Sami Rosenblatt, Jared Hertzberg, Jose Chavez-Garcia, Nicholas Bronn, Hanhee Paik, Martin Sandberg, Easwar Magesan, John Smolin, Jeng-Bang Yau, Vivekananda Adiga, Markus Brink, Jerry Chow
Bulletin of the American Physical Society, 2019
yield, quantum, computer science, computational science

System and method for routing signals in complex quantum systems
Sandberg Martin O, Mckay David C, Gumann Patryk M, Paik Hanhee, Gambetta Jay M
2019
Abstract   qubit, quantum computer, quantum circuit, quantum, physics, electronic circuit, electrical engineering, chip

SIGNAL ROUTING IN COMPLEX QUANTUM SYSTEMS
Sandberg Martin O, Mckay David C, Gumann Patryk M, Paik Hanhee, Gambetta Jay M
2019
Abstract   signal routing, qubit, quantum computer, quantum circuit, quantum, physics, electronic circuit, electrical engineering, chip

Quantum communication link robust against photon loss
Bishop Lev S, Gambetta Jay M, Paik Hanhee
2019
Abstract   topology, qubit, quantum state, quantum information science, polarization, physics, photon, controlled not gate

FREQUENCY TUNING OF MULTI-QUBIT SYSTEMS
Rosenblatt Sami, Orcutt Jason, Paik Hanhee, Sandberg Martin, Hertzberg Jared Barney
2019
Abstract   qubit, physics, optoelectronics, josephson effect

QUANTUM COMPUTING DEVICE DESIGN
Paik Hanhee, Solgun Firat, Olivadese Salvatore, Sandberg Martin, Gambetta Jay
2019
Abstract   quantum computer, quantum, modeling and design, hamiltonian, computer science, computational science


2018

INTEGRIERTER EINPHOTONENUMSETZER ZUM UMSETZEN VON MIKROWELLEN- AUF OPTISCHE SIGNALE MIT SPANNUNGSINDUZIERTEM ELEKTROOPTISCHEM MATERIAL
Paik Hanhee, Filipp Stefan, Bishop Lev Samuel, Gambetta Jay, Orcutt Jason Scott
2018
Abstract   physics, analytical chemistry

Auslesen von Quantenzustanden von Mikrowellenfrequenz-QUBITS mit Photonen mit optischer Frequenz
Paik Hanhee, Orcutt Jason Scott, Bishop Lev Samuel, Gambetta Jay, Rozen James
2018
Abstract   stereochemistry, physics

Cavity filtered qubit circuit
Baleegh Abdo, Jay Gambetta, Jerry Moy Chow, Hanhee Paik
2018
Abstract   resonator, resonance, qubit, physics, optoelectronics, microwave, capacitive coupling

Frequency precision in fixed-frequency transmon qubits, and implications for scalable fault-tolerant quantum computing circuits
Jared Hertzberg, Sami Rosenblatt, Jose Chavez, Nicholas Bronn, Hanhee Paik, Martin Sandberg, Easwar Magesan, John Smolin, Markus Brink, Jerry Chow
Bulletin of the American Physical Society2018
transmon, scalability, qubit, quantum computer, fixed frequency, fault tolerance, electronic engineering, electronic circuit, computer science


2017

Characterization of hidden modes in networks of superconducting qubits
Sheldon, Sarah and Sandberg, Martin and Paik, Hanhee and Abdo, Baleegh and Chow, Jerry M and Steffen, Matthias and Gambetta, Jay M
arXiv preprint arXiv:1703.04501, 2017
Abstract


2016

Characterization of the resonator induced phase gate
Antonio Mezzacapo, H. Paik, M. O. Sandberg, D. T. McClure, B. Abdo, O. E. Dial, A. W. Cross, A. D. Corcoles, S. Sheldon, E. Magesan, S. J. Srinivasan, J. M. Chow, J. M. Gambetta, D. Bogorin, B. L. T. Plourde
Bulletin of the American Physical Society, 2016
resonator, phase gate, optoelectronics, materials science, helical resonator

Demonstrating Multi-Qubit Operations in a Superconducting 3D circuit QED Architecture
Hanhee Paik, M.O. Sandberg, A. Mezzacapo, D. T. McClure, B. Abdo, O.E. Dial, A.W. Cross, A.D. Corcoles, S. Sheldon, E. Magesan, S.J. Srinivasan, J.M. Gambetta, J.M. Chow, D. Bogorin, B.L.T. Plourde
Bulletin of the American Physical Society, 2016
superconductivity, qubit, physics, nanotechnology, electrical engineering, architecture

Experimental Demonstration of a Resonator-Induced Phase Gate in a Multiqubit Circuit-QED System
Paik, Hanhee and Mezzacapo, A and Sandberg, Martin and McClure, DT and Abdo, B and C{\'o}rcoles, AD and Dial, O and Bogorin, DF and Plourde, BLT and Steffen, M and others
Physical Review Letters 117(25), 250502, APS, 2016
Abstract

Rapid driven reset of a qubit readout resonator
McClure, DT and Paik, Hanhee and Bishop, LS and Steffen, M and Chow, Jerry M and Gambetta, Jay M
Physical Review Applied 5(1), 011001, APS, 2016
Abstract


2015

Superconducting Qubit Optical Transducer (SQOT)
Colm Ryan, Hanhee Paik
2015
transducer, superconductivity, qubit, quantum mechanics, physics, phase qubit, flux qubit, charge qubit

Spurious modes in 3D multi-qubit circuits
Martin Sandberg, Douglas Mcclure, Hanhee Paik, Daniela F. Bogorin, B.L.T. Plourde, Oliver Dial, Baleegh Abdo
Bulletin of the American Physical Society2015
topology, spurious relationship, qubit, physics, electronic circuit

Design and processing considerations for superconducting qubits coupled to multiple 3D cavities
Daniela F. Bogorin, B.L.T. Plourde, Douglas McClure, Martin Sandberg, Hanhee Paik, Baleegh Abdo
Bulletin of the American Physical Society2015
superconductivity, superconducting quantum computing, qubit, physics, condensed matter physics

Novel quantum electro-optic transducer for quantum information processing using superconducting 3D qubits
H. Paik, L. S. Bishop, D. T. McClure, S. Filipp, J. M. Gambetta, C. B. Lirakis, C. A. Ryan, J. Schlafer, M. P. da Silva, M. Soltani, M. Patel, Z. Dutton
Bulletin of the American Physical Society2015
trapped ion quantum computer, superconducting tunnel junction, superconducting quantum computing, quantum technology, quantum sensor, quantum network, quantum mechanics, quantum imaging, quantum error correction, physics, optoelectronics

Fast Resonator Depopulation with a Simple Measurement Pulse Shape
Douglas McClure, Hanhee Paik, Lev S. Bishop, Jay Gambetta, Matthias Steffen, Jerry Chow
Bulletin of the American Physical Society, 2015
resonator, pulse, optics, nuclear magnetic resonance, materials science

Enhancing the coherence of 3D qubits suitable for multi-qubit experiments
Baleegh Abdo, Douglas McClure, Hanhee Paik, Martin Sandberg, Jay Gambetta, Oliver Dial
Bulletin of the American Physical Society, 2015
qubit, quantum mechanics, physics, coherence


2014

Decoherence and Coupling in 3D Transmons
Oliver Dial, Douglas McClure, Stefano Poletto, Jay Gambetta, Hanhee Paik, Matthias Steffen, Chris Lirakis
Bulletin of the American Physical Society2014
quantum mechanics, quantum decoherence, physics, coupling


2013

Approaching 10 Milliseconds for Aluminum Cavities in the Quantum Regime
Matthew Reagor, Hanhee Paik, Gianluigi Catelani, Luyan Sun, Christopher Axeline, Teresa Brecht, Jacob Blumoff, Luigi Frunzio, Leonid Glazman, Robert Schoelkopf
Bulletin of the American Physical Society2013
quantum mechanics, quantum, physics, millisecond, condensed matter physics, aluminium

High fidelity all-microwave controlled-phase gate for superconducting qubits by cavity vacuum displacement
Hanhee Paik, D. Zhou, Reed, G. Kirchmair, L. Frunzio, S.M. Girvin, R.J. Schoelkopf
Bulletin of the American Physical Society, 2013
superconductivity, qubit, phase gate, optoelectronics, microwave, materials science, high fidelity

Ten Milliseconds for Aluminum Cavities in the Quantum Regime
M. Reagor, Hanhee Paik, G. Catelani, L. Sun, C. Axline, E. Holland, I. M. Pop, N. A. Masluk, T. Brecht, L. Frunzio, M. H. Devoret, L. I. Glazman, R. J. Schoelkopf
2013
quantum mechanics, quantum, physics, millisecond, aluminium

Reaching 10 ms single photon lifetimes for superconducting aluminum cavities
Matthew Reagor, Hanhee Paik, Gianluigi Catelani, Luyan Sun, Christopher Axline, Eric Holland, Ioan M Pop, Nicholas A Masluk, Teresa Brecht, Luigi Frunzio, others
Applied Physics Letters 102(19), 192604, AIP Publishing, 2013

Observation of quantum state collapse and revival due to the single-photon Kerr effect
Gerhard Kirchmair, Brian Vlastakis, Zaki Leghtas, Simon E Nigg, Hanhee Paik, Eran Ginossar, Mazyar Mirrahimi, Luigi Frunzio, SM Girvin, RJ Schoelkopf
Nature 495(7440), 205--209, Nature Publishing Group, 2013


2012

Varying Cavity Quality Factor in situ for a Transmon in Circuit QED
Andrei Petrenko, Adam Sears, Gerhard Kirchmair, Hanhee Paik, Luyan Sun, Gianluigi Catelani, Leonid Glazman, Robert Schoelkopf
APS2012
transmon, physics, optoelectronics, in situ

Improving the Coherence Time of Microwave Cavities
Matthew Reagor, Hanhee Paik, Luyan Sun, Eric Holland, Luigi Frunzio, Robert Schoelkopf
Bulletin of the American Physical Society, 2012
optics, microwave, materials science, coherence time

Dephasing Due to Shot Noise in the Strong Dispersive Limit of Circuit QED
Adam Sears, Andrei Petrenko, Gerhard Kirchmair, Hanhee Paik, Luyan Sun, Gianluigi Catelani, Leonid Glazman, Robert Schoelkopf
Bulletin of the American Physical Society, 2012
shot noise, quantum mechanics, quantum electrodynamics, physics, dephasing

Observation of single artificial atom optical bi-stability and its application to single-shot readout in circuit quantum electrodynamics
Luyan Sun, Eran Ginossar, Mikhael Guy, Matthew Reed, Hanhee Paik, Lev S. Bishop, Adam Sears, Andrei Petrenko, Teresa Brecht, Luigi Frunzio, Steven Girvin, Robert Schoelkopf
Bulletin of the American Physical Society, 2012
quantum mechanics, physics, circuit quantum electrodynamics, cavity quantum electrodynamics, artificial atom

Experiments on a three mode circuit QED system
Gerhard Kirchmair, Brian Vlastakis, Hanhee Paik, Simon Nigg, Luigi Frunzio, Steven Girvin, Michel Devoret, Robert Schoelkopf
Bulletin of the American Physical Society, 2012
quantum electrodynamics, physics

Photon shot noise dephasing in the strong-dispersive limit of circuit QED
AP Sears, A Petrenko, G Catelani, L Sun, Hanhee Paik, G Kirchmair, L Frunzio, LI Glazman, SM Girvin, RJ Schoelkopf
Physical Review B 86(18), 180504, APS, 2012

Black-box superconducting circuit quantization
Simon E Nigg, Hanhee Paik, Brian Vlastakis, Gerhard Kirchmair, Shyam Shankar, Luigi Frunzio, MH Devoret, RJ Schoelkopf, SM Girvin
Physical review letters 108(24), 240502, APS, 2012


2011

Decoherence in Improved Transmon Qubits
Adam Sears, Hanhee Paik, David Schuster, Lev Bishop, Gerhard Kirchmair, Luigi Frunzio, Michel Devoret, Rob Schoelkopf
Bulletin of the American Physical Society, 2011
transmon, qubit, quantum mechanics, quantum decoherence, physics

Investigating decoherence in the transmon qubit using a 3D resonator
Hanhee Paik, D.I. Schuster, L. Bishop, A.P. Sears, G. Kirchmair, L. Frunzio, M.H. Devoret, R.J. Schoelkopf
Bulletin of the American Physical Society, 2011
transmon, resonator, qubit, quantum mechanics, quantum decoherence, physics, phase qubit

Anomalous switching curves in a dc SQUID phase qubit
Hyeokshin Kwon, AJ Przybysz, BK Cooper, H Paik, KD Osborn, BS Palmer, R Budoyo, JR Anderson, CJ Lobb, FC Wellstood
Applied Superconductivity, IEEE Transactions on 21(3), 860--863, IEEE, 2011

How coherent are Josephson junctions
Hanhee Paik, DI Schuster, Lev S Bishop, G Kirchmair, G Catelani, AP Sears, BR Johnson, MJ Reagor, L Frunzio, L Glazman, others
arXiv preprint arXiv:1105.46522, 2011

Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
Hanhee Paik, DI Schuster, Lev S Bishop, G Kirchmair, G Catelani, AP Sears, BR Johnson, MJ Reagor, L Frunzio, LI Glazman, others
Physical review letters 107(24), 240501, APS, 2011


2010

Quality factor dependence on geometry and photon number in superconducting coplanar resonators
Moe Khalil, Micah Stoutimore, Hanhee Paik, Frederick Wellstood, Kevin Osborn
Bulletin of the American Physical Society, 2010
superconductivity, resonator, physics, photon, optoelectronics

Quantum regime dielectric loss studies of bulk substrates with a high-Q superconducting cavity
Hanhee Paik, Luigi Frunzio, Robert Schoelkopf
Bulletin of the American Physical Society, 2010
superconducting cavity, quantum, materials science, gate dielectric, dielectric loss, condensed matter physics

Reducing quantum-regime dielectric loss of silicon nitride for superconducting quantum circuits
Paik Hanhee, Kevin D Osborn
Applied Physics Letters 96(7), 072505--072505, AIP, 2010

Multilevel spectroscopy of two-level systems coupled to a dc SQUID phase qubit
TA Palomaki, SK Dutta, RM Lewis, AJ Przybysz, Hanhee Paik, BK Cooper, H Kwon, JR Anderson, CJ Lobb, FC Wellstood, others
Physical Review B 81(14), 144503, APS, 2010


2009

Optimizing silicon nitride for superconducting quantum circuits
Hanhee Paik, Kevin Osborn
Bulletin of the American Physical Society, 2009
superconductivity, silicon nitride, quantum, optoelectronics, nitride, materials science, electronic circuit

Low-photon number studies of inductively-coupled superconducting resonators
Moe Khalil, Hanhee Paik, Fred Wellstood, Kevin Osborn
Bulletin of the American Physical Society, 2009
superconducting tunnel junction, superconducting resonators, pi josephson junction, physics, photon, josephson phase, condensed matter physics

LC Filtered dc SQUID Phase Qubit with Low Dielectric Loss
Hyeokshin Kwon, A. J. Przybysz, T. A. Palomaki, Hanhee Paik, K. D. Osborn, R. M. Lewis, B. K. Cooper, J. R. Anderson, C. J. Lobb, F. C. Wellstood
Bulletin of the American Physical Society, 2009
squid, pi josephson junction, physics, phase qubit, josephson phase, josephson energy, dielectric loss, condensed matter physics

Dc SQUID phase qubit with an LC filter
Hyeokshin Kwon, AJ Przybysz, TA Palomaki, RM Lewis, BS Palmer, H Paik, SK Dutta, BK Cooper, JR Anderson, CJ Lobb, others
Applied Superconductivity, IEEE Transactions on 19(3), 957--960, IEEE, 2009


2008

Microwave Reflectometry Measurements of Flux States of a dc SQUID Phase Qubit
B. K. Cooper, R. M. Lewis, S. K. Dutta, T. A. Palomaki, Anthony Przybysz, H. Kwon, Hanhee Paik, J. R. Anderson, C. J. Lobb, F. C. Wellstood
Bulletin of the American Physical Society, 2008
squid, scanning squid microscopy, physics, phase qubit, microwave reflectometry, flux qubit, flux, condensed matter physics

DC SQUID Phase Qubit with LC Filter
Hyeokshin Kwon, A.J. Przybysz, Hanhee Paik, R.M. Lewis, T.A. Palomaki, S.K. Dutta, B.K. Cooper, J.R. Anderson, C.J. Lobb, F.C. Wellstood
Bulletin of the American Physical Society, 2008
squid, physics, phase qubit, optoelectronics, lc circuit

Decoherence in dc SQUID phase qubits
Hanhee Paik, SK Dutta, RM Lewis, TA Palomaki, BK Cooper, RC Ramos, H Xu, AJ Dragt, JR Anderson, CJ Lobb, others
Physical Review B 77(21), 214510, APS, 2008

Multilevel effects in the Rabi oscillations of a Josephson phase qubit
SK Dutta, Frederick W Strauch, RM Lewis, Kaushik Mitra, Hanhee Paik, TA Palomaki, Eite Tiesinga, JR Anderson, Alex J Dragt, CJ Lobb, others
Physical Review B 78(10), 104510, APS, 2008


2007

Increasing Spectroscopic Coherence Times of a DC SQUID Phase Qubit by Operating Deeper in the Potential Well
R.M. Lewis, S.K. Dutta, Hanhee Paik, T.A. Palomaki, B.K. Cooper, A.J. Przybysz, A.J. Dragt, J.R. Anderson, C.J. Lobb, F.C. Wellstood
IEEE Transactions on Applied Superconductivity 17(2), 101-104, 2007
Abstract   squid, root mean square, quantum information, quantum decoherence, physics, phase qubit, josephson effect, condensed matter physics, coherence time, coherence

Measurements of Decoherence in Three dc SQUID Phase Qubits
H. Paik, B.K. Cooper, S.K. Dutta, R.M. Lewis, R.C. Ramos, T.A. Palomaki, A.J. Przybysz, A.J. Dragt, J.R. Anderson, C.J. Lobb, F.C. Wellstood
IEEE Transactions on Applied Superconductivity 17(2), 120-123, 2007
Abstract   time constant, squid, rabi cycle, quantum decoherence, physics, phase noise, nuclear magnetic resonance, magnetometer, laser linewidth, gradiometer, condensed matter physics

Strong-Field Effects in the Rabi Oscillations of the Superconducting Phase Qubit
F.W. Strauch, S.K. Dutta, Paik Hanhee, T.A. Palomaki, K. Mitra, B.K. Cooper, R.M. Lewis, J.R. Anderson, A.J. Dragt, C.J. Lobb, F.C. Wellstood
IEEE Transactions on Applied Superconductivity 17(2), 105-108, 2007
Abstract   superconducting quantum computing, rabi problem, rabi frequency, rabi cycle, qubit, quantum mechanics, physics, phase qubit, flux qubit, condensed matter physics, charge qubit

Coherence in dc SQUID phase qubits
Hanhee Paik
2007 - books.google.com, ProQuest

Pulse current measurements and Rabi oscillations in a dc SQUID phase qubit
TA Palomaki, SK Dutta, RM Lewis, H Paik, K Mitra, BK Cooper, AJ Przybysz, AJ Dragt, JR Anderson, CJ Lobb, others
Applied Superconductivity, IEEE Transactions on 17(2), 162--165, IEEE, 2007


2006

Some properties of a dc SQUID qubit
RM Lewis, Hanhee Paik, SK Dutta, TA Palomaki, K Mitra, BK Cooper, A Przybysz, JR Anderson, CJ Lobb, FC Wellstood
Defense and Security Symposium, pp. 624402--624402, 2006

Fast High-Fidelity Measurements of the Ground and Excited States of a dc-SQUID Phase Qubit
TA Palomaki, SK Dutta, RM Lewis, Hanhee Paik, K Mitra, BK Cooper, AJ Przybysz, AJ Dragt, JR Anderson, CJ Lobb, others
arXiv preprint cond-mat/0608399, 2006

Initializing the flux state of multiwell inductively isolated Josephson junction qubits
TA Palomaki, SK Dutta, Hanhee Paik, H Xu, J Matthews, RM Lewis, RC Ramos, K Mitra, Philip R Johnson, Frederick W Strauch, others
Physical Review B 73(1), 014520, APS, 2006


2005

Cooper-pair box as a variable capacitor
H. Paik, F.W. Strauch, R.C. Ramos, A.J. Berkley, H. Xu, S.K. Dutta, P.R. Johnson, A.J. Dragt, J.R. Anderson, C.J. Lobb, F.C. Wellstood
IEEE Transactions on Applied Superconductivity 15(2), 884-887, 2005
Abstract   variable capacitor, qubit, quantum information, physics, josephson effect, equivalent circuit, coupling, cooper pair, condensed matter physics, capacitance

Spectroscopy of three-particle entanglement in a macroscopic superconducting circuit
Huizhong Xu, Frederick W Strauch, SK Dutta, Philip R Johnson, RC Ramos, AJ Berkley, H Paik, JR Anderson, AJ Dragt, CJ Lobb, others
Physical review letters 94(2), 027003, APS, 2005


2001

Optical properties of RNi2B2C (R= Y, Lu, Ho, Er) intermetallic borocarbide superconductors
Mi-Ock Mun, Young Jin Kim, Young Keun Yoon, Hanhee Paik, Jae Hoon Kim, Sung-Ik Lee, BK Cho
JOURNAL OF THE KOREAN PHYSICAL SOCIETY 39(2), 406--408, KOREAN PHYSICAL SOC 635-4, YUKSAM-DONG, KANGNAM-KU, SEOUL 135-703, SOUTH KOREA, 2001


2000

Infrared and optical properties of single-crystal YNi2B2C superconductor
Jae Hoon Kim, Hanhee Paik, Mi Ock Mun, B. K. Cho, S. J. Youn, H. B. Kim, Sung Ik Lee
Physica C-superconductivity and Its Applications, 2233-2234, 2000
Abstract   single crystal, physics, optical conductivity, infrared spectroscopy, infrared, ellipsometry, drude model, crystal, conductivity, condensed matter physics

Infrared and optical properties of single-crystal YNi< sub> 2 B< sub> 2 C superconductor
Jae Hoon Kim, Hanhee Paik, Mi-Ock Mun, BK Cho, SJ Youn, HB Kim, Sung-Ik Lee
Physica C: Superconductivity341, 2233--2234, Elsevier, 2000