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Faculty and Staff Profiles

Myriam Sarachik

Distinguished Professor

School/Division

Division of Science

Department

Physics

Office

Marshak 301

p: 212-650-5618

f: 212-650-6940

e: sarachik@sci.ccny.cuny.edu

w: View my website >>

  • Profile

    Dr. Sarachik has served in an advisory capacity to the National Science Foundation, the US Department of Energy, the American Institute of Physics, the National Research Council, and the National Academy of Sciences. She has been a member and the chair of the Solid State Sciences Committee of the Board on Physics and Astronomy of the National Research Council and a member of the Board of the American Institute of Physics. Following many years' activities on numerous committees and as a Board member, she served as President of the American Physical Society in 2003.  She has served on the Governing Council of the National Academy of Sciences (NAS).


    She has served on numerous site visiting teams, evaluation panels, prize selection committees, and fellowship selection committees. She is a member of the International Advisory Panel of the Zernike Institute for Advanced Materials of the University of Groningen in the Netherlands, and a member of the Science Advisory Committee of the Hong Kong University of Science and Technology. She is currently a member of the Council of the American Association for the Advancement of Science (AAAS).

    Professor Sarachik has been active in defending the human rights of scientists as a National Board member of the Committee of Concerned Scientists, a long-time member of the Human Rights of Scientists Committee of the New York Academy of Sciences, and as a member and chair of the Committee on the International Freedom of Scientists of the American Physical Society.

  • Education

    Born in Antwerp, Belgium, Myriam Sarachik attended primary school in Antwerp and Havana, Cuba and high school at the Bronx High School of Science in New York. She earned a A. B. cum laude from Barnard College in 1954, majoring in physics. After working for a year at the IBM Watson Laboratories at Columbia University, she returned to graduate school to earn a M.S. in 1957 and a Ph.D. in 1960 from Columbia University.
  • Research Interests

    Low Temperature Research at CCNY
    molecular nanomagnets   hallbar

     

    The Low Temperature Research Group at the City College of New York (CCNY) Physics Department is dedicated to the study of condensed matter properties at low temperature. We are currently interested in two areas:

     (I) Molecular Nanomagnets

    Computing power/speed and the density of memory elements for storing and manipulating information has been steadily increasing, while the size of the component memory " bits " have been decreasing very rapidly. Considerable effort is currently being devoted to methods for storing information at molecular length scales. In order to continue our steep trajectory to better, smaller and faster computers, we must learn to understand and manipulate physics and chemistry at the molecular level. Moreover, quantum computation, a new and entirely different computing paradigm based on quantum phenomena, is being widely explored, both mathematically and experimentally. Rather than having two possible " classical " values, 0 or 1, the quantum mechanical elements of quantum computers, called " qubits ", represent a far broader set of possibilities, enabling much greater computing power.

    A number of potential candidates for high-density information storage and quantum computation are under investigation, among them molecular nanomagnets, sometimes referred to as " single molecule magnets "  We are studying Mn 12 -Acetate, a prototypical member of this class of materials. Mn 12 -acetate is an organic molecular crystal containing a very large number of regularly spaced, magnetically identical spin-10 clusters, a size that is borderline between the quantum and classical regimes. The first demonstration of resonant tunneling of a mesoscopic spin was done in our laboratory in 1996. This finding led to an enormous increase in interest and activity in the study of molecular nanomagnets, sometimes referred to as "single molecule magnets".

    The first demonstration of resonant quantum tunneling of a mesoscopic spin was realized in our laboratory in 1996. This discovery led to an enormous increase in interest and activity in the study of molecular nanomagnets, sometimes referred to as "single molecule magnets".  Through time-resolved measurements of the local magnetization obtained using micron-sized Hall sensors, we discovered (in 2005) that a magnetic avalanche corresponding to the fast reversal of the magnetization of a single crystal spreads as a narrow interface that propagates through the crystal at a constant velocity roughly two orders of magnitude smaller than the speed of sound. This phenomenon is closely analogous to the propagation of a flame front (deflagration) through a flammable chemical substance.

    Current work is focused on (1) a search for dipolar ferromagnetism in molecular magnets; (2) the effect of random fields on the magnetic response; (3) detailed investigations of magnetic deflagration; (4) a search for magnetic avalanches driven by dipolar forces rather than thermal energy; and (5) the possibility of emission of super-radiance in the Tz range of the electromagnetic spectrum during magnetic avalanches.  

    (II) Novel Phenomena in Dilute Two-Dimensional Electron Systems.

    One of the most interesting current questions in condensed matter physics is whether the unusual behavior observed in dilute, strongly-interacting two dimensional systems of electrons (or holes) signals the presence of a metallic phase and a metal-insulator transition.

    According to well-established theory, two-dimensional systems of weakly interacting electrons (or holes) are expected to be insulating in the absence of a magnetic field (B=0) in the limit of zero-temperature. Experiments performed in the early 1980's provided confirmation of these expectations for relatively high electron densities. The availability within the last decade of samples of unusually high mobilities has allowed access to much lower electron (hole) densities, where electron interactions are quite strong. Unexpected metallic behavior has been observed in this low-density regime: for electron densities above some critical (low) density the resistivity decreases with decreasing temperature down to the lowest accessible temperatures while exhibiting insulating behavior at lower densities. This suggests there exists a true metallic phase in 2D which was thought to be forbidden.

    The response of these systems to external magnetic field is also unusual and dramatic. A (density-dependent) external magnetic field on the order of a few Tesla applied parallel to the plane of the electrons causes the resistivity to increase sharply to a much larger, constant value; the parallel magnetic field suppresses or "quenches" the metallic temperature dependence.

    These findings have fueled a lively debate. The issue is whether these novel effects represent fundamentally new physics or whether they can be explained by an extension of physics that is already understood.  In a recent experiment on strongly-interacting electrons in silicon, we have shown that the thermoelectric power increases with decreasing density, tending toward infinity at a finite, well-defined density.  These results provide clear evidence for an interaction-induced transition to a new phase at low density.

    Current work on these systems includes: (1) exploring the behavior of the thermopower in the presence of an in-plane magnetic field (which has been shown to quench the metallic phase); (2) a search for the long sought-after Wigner solid at very low electron densities.

     
  • Publications

    arXiv.org

    Google Scholar

    "Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System," P. Subedi, S. Velez, F. Macia, S. Li, M. P. Sarachik, J. Tejada, S. Mukherjee, G. Christou, and A. D. Kent, Phys. Rev. Lett. 110, 207203 (2013).



    "Magnetic Avalanches In Molecular Magnets," M. P. Sarachik, in Molecular Magnets: Physic and Applications, to be published (Springer 2013).

    "Quantum Fluctuations and Long-Range Order in Molecular Magnets," P. Subedi, Bo Wen, Y. Yeshurun, M. P. sarachik, A. J. Millis, and A. D. Kent, Polyhedron (2013), doi: http://dx.doi.org/10.1016/ j.poly.2013.05.009

    "Critical Behavior of a Strongly-interacting 2D Electron System," A. Mokashi, Shiqi Li, Bo Wen, S. V. Kravchenko, A. A, Shashkin, V. T. Dolgopolov, and M. P. Sarachik, Phys. Rev Lett. 109, 096405 (2012).

    "Transverse Field Ising Ferromagnetism in Mn12-acetate-MeOH," P. Subedi, A. D. Kent, Bo Wen, Y. Yeshurun, M. P. Sarachik, A. J. Millis, C. Lampropoulos, and G. Christou, Phys. Rev. B 85, 134441 (2012).

    "Magnetic Avalanches in Molecular Nanomagnets," S. McHugh and M. P. Sarachik, Mod. Phys. Lett. B 25, 1795-1807 (2011).

    "Experimental Determination of the Weiss Temperature of Mn-ac and Mn-ac-MeOH," Shiqi Li, Lin Bo, Bo Wen, M. P. Sarachik, P. Subedi, A. D. Kent, Y. Yeshurun, A. J. Millis, C. Lampropoulos, S. Murkherjee, and G. Christou, Phys. Rev. B. 82, 174405 (2010).

    "Realization of Random-Field Ising Ferromagnetism in a Molecular Magnet," Bo Wen, P. Subedi, Lin Bo, Y. Yeshurun, M. P. Sarachik, A. D. Kent, A. J. Millis, C. Lampropoulos, and G. Christou, Phys. Rev. B 82, 014406 (2010).

    "Metal-Insulator Transition in 2D: Established facts and open questions," S. V. Kravchenko and M. P. Sarachik, in 50 Years of Anderson Localization, edited by Elihu Abrahams (World Scientific, 2010); International Jour. of Mod. Phys. B, 24, 1640-1663 (2010).

    "Magnetic Avalanches in Molecular Nanomagnets,"  M. P. Sarachik and S. McHugh, in Perspective in Mesoscopic Physics - Dedicated to Professor Yosef Imary's 70th Birthday, to be published by World Scientific (2010).

    "Scaling of the Thermoelectric Voltage induced by Microwave Radiation at the Boundary between 2D Electron Systems," Ivan A. Larkin, N. Romero Kalmanovitz, I. Hoxha, Y. Jin, S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, AIP Conf. Proc. 119, 215 (2010).

    "Single Molecule Nanomagnets," J. R. Friedman and M. P. Sarachik, Annual Reviews of Condensed Matter Physics, 1, 109, (2010).

    "Pure and Random-Field Quantum Criticality  in the Dipolar Ising Model: Theory of Mn12- acetates," A. J. Millis, A. D. Kent, M. P, Sarachik, and Y. Yeshurun,  Phys Rev B 81, 024423 (2010).

    "Scaling of Thermoelectric Voltage Induced by Microwave Radiation at the Boundary between Two-Dimensional Electron Systems," I. A. Larkin, N. Romero-Kalmanovitz, I. Hoxha, Y. Jin, S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk,  PHYSICS OF SEMICONDUCTORS, Book Series: AIP Conference Proceedings 1199, 215-216 (2009).

    "Magnetic Avalanches of Minor fast-relaxing Species of Mn12 Acetate," S. McHugh, R. Jaafar, M. P. Sarachik, Y. Myasoedv, E. Zeldov, R. Bagai, and G. Christou, Phys Rev B 80, 024403 (2009).

    "Tuning magnetic avalanches in the molecular magnet Mn12-acetate," S. McHugh, Bo Wen, Xiang Ma, M. P. Sarachik, Y. Myasoedv, E. Zeldov, R. Bagai, and G. Christou, Physical Rev. B 79, 174413 (2009).

    "Experimental Determination of the Dipole Field in Mn12-acetate," S. McHugh, R. Jaafar, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, R. Bagai, and G. Christou, Phys. Rev. B 79, 052404 (2009).

    "Effect of Parallel Magnetic Field on the Zero Differential Resistance State," N. Romero, S. McHugh, M. P. Sarachik. A. Vitkalov, and A. A. Bykov, Phys. Rev. B 78, 153311 (2008).

    "Rectification of Microwave Radiation at a Split Gate on a Silicon MOSFET," A. Larkin, S. A. Vitkalov, and M. P. Sarachik, to be published in Brazilian Jour. of  Phys. (2008).

    "Scaling of Thermoelectric Voltage Induced by Microwave Radiation at the Boundary between Two-Dimensional Electron Systems," N. Romero-Kalmanovitz, I. Hoxha, Y. Jin, S. A. Vitkalov, M. P. Sarachik, Ivan A. Larkin, and T. M. Klapwijk, Phys. Rev. B 77, 035415 (2008).

    "Spatial Determination of Magnetic Avalanche Ignition Points," R. Jaafar, S. McHugh, Yoko Suzuki, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, R. Bagai, and G. Christou, JMMM 320, 695-698 (2008).

    "Effect of Quantum Tunneling on the Ignition and Propagation of Magnetic Avalanches in Mn12-Acetate," S. McHugh, R. Jaafar, M. P. Sarachik, Y. Myasoedv, A. Finkler, H. Shtrikman, E. Zeldov, R. Bagai, and G. Christou, Phys. Rev. B 76, 172410 (2007).

    "Microwave Rectification at the Boundary between Two-Dimensional Electron Electron Systems," I. Hoxha, S. A. Vitkalov, N. A. Zimbovskaya, M. P. Sarachik, and T. M. Klapwijk, cond-mat/011031 (2007).
     
    "Propagation of Avalanches in Mn-12-acetate: Magnetic Deflagration," Y. Suzuki, M. P. Sarachik, E. M. Chudnovsky, S. Mc Hugh, R. Gonzalez-Rubio, N. Avraham, Y. Myasoedov, E. Zeldov, H. Shtrikman, N. E. Chakov, and G. Christou, Phys. Rev. Letters 95, Art. No. 147201 (2005).

    "Local Measurements of Magnetization in Mn12 Crystals," Nurit Avraham, Ady Stern, E. Zeldov, Yoko Suzuki, K. M. Mertes, M. P. Sarachik, E. M. Rumberger, D. N. Hendrickson, N. Chakov and G. Christou, Phys. Rev. B. 72, 144428 (2005).

    "Magnetoconductivity of Dilute 2D Electron Systems on a Silicon Surface," Sergey A. Vitkalov, Y. Tsui, M. P. Sarachik, and T. M. Klapwijk, Proceedings of 27th International Conference of the Physics of Semiconductors, Flagstaff, USA, July 26-30 (2004).

    "The Occurrence of Avalanches in a Single Crystal of Mn12-acetate," Yoko Suzuki, M. P. Sarachik, N. Avraham, Y. Myasoedov, H. Shtrikman, E. Zeldov, E. M. Rumberger, H. Hendrickson and G. Christou, Jour. Appl. Phys. 97, 1 (2005).

    "Conductivity of Silicon Inversion Layers: Comparison with and without magnetic field," Yeekin Tsui, S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B 71, 113308 (2005).

    "Novel Phenomena in Dilute Electron Systems in Two Dimensions," M. P. Sarachik and S. V. Kravchenko, European Physical Journal B - Condensed Matter 40, 397 (2004).

    "Magnetoconductivity of Insulating Silicon Inversion Layers," Yeekin Tsui, S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B 71. 033312 (2005).

    "Electrical Resistivity of Acceptor Carbon in GaAs." A. Ferreira da Silva, I. Pepe, Bo E. Sernelius, C. Persson, R. Ahuja, J. P. de Souza, Yoko Suzuki, and Y. Yang, J. Appl. Phys. 95, 2532-5 (2004).

    "Quantum Tunneling of Magnetization in Single Molecule Magnets," K. M. Mertes, Yoko Suzuki, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, E. M. Rumberger, D. N. Hendrickson, and G. Christou,, Transworld Research Network, 37/661 (2), Fort P.O., Trivandrum-695 023, Kerala, India (2003); Recent Research Developments in Physics, 4(2003): 731-747.

    "Tunnel Splitting Distributions and Dipolar Shuffling in Mn12-acetate," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou,, J. Magn. Magn. Mater. 272-276, Suppl 1, E719-720 (2004).

    "Thermally-assisted Tunneling for a Distribution of Tunnel Splittings in Mn12-acetate" Y. Suzuki, K. M. Mertes, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, J. Magn. Magn. Mater. 272-276, Suppl 1, E739-740 (2004).

    "Metal-Insulator Transition in Two-Dimensional Electron Systems," S. V. Kravchenko and M. P. Sarachik, Rep. Prog. Phys. 67, 1-44 (2004).

    "Mn12-Acetate: a Prototypical Single Molecule Magnet," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Myasoedov, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, Solid State Commun. 127, 131-139 (2003).

    "Does m*g* diverge at a finite electron density in silicon inversion layers?," Myriam P. Sarachik and Sergey A. Vitkalov, J. Phys. Soc. Jpn. Suppl. A 72, 57-62 (2003).

    "More Evidence for a Distribution of Tunnel Splittings in Mn12-acetate," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, Jour. Appl. Phys., 93, 7095 (2003).

    "In-plane Magnetoconductivity of Si-MOSFET's: A Quantitative Comparison between Theory and Experiment," S. A. Vitkalov, K. James, B. Narozhny, M. P. Sarachik, and T. M. Klapwijk, Phys Rev. B 67, 113310 (2003).

    "Spin polarization of strongly interacting 2D electrons: the role of disorder," S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B (Rapid Communication) 65, 201106 (2002).

     "Scaling of the Conductivity of Si:B: A Temperature-Independent Variable-Range Hopping Prefactor." M. P. Sarachik and Peihua Dai, Europhys. Lett. 59, 100 (2002).

    "Ground state Tunneling due to a Distribution of Tunnel Splittings in Mn12-Acetate," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, Jour. Appl. Phys. 91, 7161 (2002).

    "Ground-State Tunneling in Mn12-acetate," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, Phys. Rev. B 65, 212401 (2002).

    "Disorder-Dependence of the Critical Density in Two-Dimensional Systems: An Empirical Relation," M. P. Sarachik, Europhys. Lett. 57 (4), pp. 546-549 (2002).

    "Variable-Range Hopping in Si:B: A Temperature-Independent Prefactor in Three Dimensions," M. P. Sarachik and P. Dai, Phys. Stat. Sol. (b) 230, 205-209 (2002).

    "Scaling behavior of the magnetoconductivity of dilute 2D electrons: Transition to a spin ordered phase," S. A. Vitkalov and M. P. Sarachik, Phys. Stat. Sol. 230, 73-79 (2002).

     "Metal-Insulator Transitions in Interacting Disordered Systems", Myriam P. Sarachik, in More is Different: Fifty Years of Condensed Matter Physics, edited by Ravin. N. Bhatt and N. Phuan Ong, (Princeton University Press, Princeton and Oxford, 2001) p. 33.

    "Temperature-Dependence of the Resistivity of a Dilute 2D Electron System in High Parallel Magnetic Field," K. M. Mertes, Hairong Zheng, S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B 63, 41101 (2001).

    "Colloquium: Metallic Behavior and Related Phenomena in Two Dimensions," E. Abrahams, S. V. Kravchenko, and M. P. Sarachik, Rev. Mod. Physics 73, 251 (2001).

    "Hall Coefficient of a Dilute 2D Electrons System in Parallel Magnetic Field," S. A. Vitkalov, H. Zheng, K. M. Mertes, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B 63, 193304 (2001).

    "Transition between Thermally-Assisted and Pure Quantum Tunneling in Mn12-Acetate," K. M. Mertes, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, and D. N. Hendrickson, Jour. Appl. Phys. 89, 6802 (2001).

    "Spin Polarization of Two-Dimensional Electrons Determined from Shubnikov-de Haas Oscillations as a Function of Angle," S. A. Vitkalov, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. B 64, 073101 (2001).

    "Scaling of the magnetoconductivity of silicon MOSFET's: evidence for a quantum phase transition in two dimensions.," S. A. Vitkalov, H. Zheng, K. M. Mertes, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. Lett. 87, 086401 (2001).

    "Evidence for a quantum phase transition in two dimensions," M. P. Sarachik and S. A. Vitkalov, Physica A 302, 368-374 (2001).

    "Abrupt Crossover between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet." K. M. Mertes, Y. Zhong, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, E. Rumberger, D. N. Hendrickson, and G. Christou, Europhys. Lett. 55, 874-879 (2001).

    Reply to Comment on "Scaling of the conductivity with temperature and uniaxial stress in Si:B at the metal-insulator transition," R. N. Bhatt, S. Bogdanovich, and M. P. Sarachik, Phys. Rev. Lett. 87, 129702-1 (2001).

    "Distribution of Tunnel Splittings in Mn12-Acetate," K. M. Mertes, Y. Suzuki, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, D. N. Hendrickson, and G. Christou, Phys. Rev. Lett. 87, 227205 (2001).

    "Hall Coefficient of the 2D Electron System in Si MOSFETs," M. P. Sarachik, D. Simonian, K. Mertes, S. V. Kravchenko, and T. M. Klapwijk, Physica B, 280, 301 (2000).

    "New Phenomena in Dilute 2D Electron Systems" M. P. Sarachik and S. V. Kravchenko, Phys. Stat. Sol. 218, 237 (2000).

    "Low temperature magnetic hysteresis in Mn12 acetate single crystals," A. D. Kent, Y. Zhong, L. Bokacheva, D. Ruiz, D. Hendrickson, and M. P. Sarachik, Europhys. Lett. 49, 521 (2000).

    "Low temperature magnetic hysteresis in Mn12 acetate single crystals," A. D. Kent, Y. Zhong, L. Bokacheva, D. Ruiz, D. Hendrickson, and M. P. Sarachik, J. Appl. Phys. 87, 5493 (2000).

    "Small-angle Shubnikov-de Haas Oscillations in Silicon MOSFET's," S. A. Vitkalov , Hairong Zheng, K. M. Mertes, M. P. Sarachik, and T. M. Klapwijk, Phys. Rev. Lett. 85, 2164 (2000).

    "Abrupt Transition between Thermally-Assisted and Pure Quantum Tunneling in Mn-12," K. M. Mertes, Yicheng Zhong, M. P. Sarachik, Y. Paltiel, H. Shtrikman, E. Zeldov, Evan Rumberger, and D. N. Hendrickson, in Macroscopic Quantum Coherence and Quantum Computing, ed. D. V. Averin, B. Ruggiero, and P. Silvestrini (Kluwer Academic/Plenum Publishers, New York 2001), p. 207.

    "Field-Dependence of the Magnetic Relaxation in Mn12," Yicheng Zhong, M. P. Sarachik, Jae Yoo, and D. N. Hendrickson, Phys. Rev. B 62, R9256  (2000).


  • Additional Information

    Myriam P. Sarachik received the 1995 New York City Mayor's Award for Excellence in Science and Technology, a 2004 Sloan Public Service Award from the Fund for the City of New York, the 2005 Oliver E. Buckley Prize in Condensed Matter Physics, and was chosen the 2005 L'Oreal/UNESCO Award "For Women in Science" for North America. She is a member of the National Academy of Sciences, a Fellow of the American Academy of Arts and Sciences, a Fellow of the American Physical Society, a Fellow of the New York Academy of Sciences, and a Fellow of the American Association for the Advancement of Science. She was awarded an honorary Doctor of Science degree by Amherst College in 2006.


    My brother, Henry Morgenstein, wrote a personal history of the family's escape from the Nazis in WWII.


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