# Single-valley quantum Hall ferromagnet in a dilute Mg_{x}Zn_{1-x}O/ZnO strongly correlated two-dimensional electron system

## Abstract

We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the Mg_{x}Zn_{1-x}O/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Landé g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.

- Authors:

- Publication Date:

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1099093

- Resource Type:
- Publisher's Accepted Manuscript

- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics

- Additional Journal Information:
- Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 85 Journal Issue: 7; Journal ID: ISSN 1098-0121

- Publisher:
- American Physical Society

- Country of Publication:
- United States

- Language:
- English

### Citation Formats

```
Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., and Kawasaki, M. Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system. United States: N. p., 2012.
Web. doi:10.1103/PhysRevB.85.075302.
```

```
Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., & Kawasaki, M. Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system. United States. doi:10.1103/PhysRevB.85.075302.
```

```
Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., and Kawasaki, M. Fri .
"Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system". United States. doi:10.1103/PhysRevB.85.075302.
```

```
@article{osti_1099093,
```

title = {Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system},

author = {Kozuka, Y. and Tsukazaki, A. and Maryenko, D. and Falson, J. and Bell, C. and Kim, M. and Hikita, Y. and Hwang, H. Y. and Kawasaki, M.},

abstractNote = {We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the MgxZn1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Landé g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.},

doi = {10.1103/PhysRevB.85.075302},

journal = {Physical Review. B, Condensed Matter and Materials Physics},

number = 7,

volume = 85,

place = {United States},

year = {2012},

month = {2}

}

DOI: 10.1103/PhysRevB.85.075302

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Works referenced in this record:

##
Possible metal-insulator transition at *B* =0 in two dimensions

journal, September 1994

- Kravchenko, S. V.; Kravchenko, G. V.; Furneaux, J. E.
- Physical Review B, Vol. 50, Issue 11

##
Resistance Spikes and Domain Wall Loops in Ising Quantum Hall Ferromagnets

journal, October 2001

- Jungwirth, T.; MacDonald, A. H.
- Physical Review Letters, Vol. 87, Issue 21

##
Ising quantum Hall ferromagnetism in InSb-based two-dimensional electronic systems

journal, June 2004

- Chokomakoua, J. C.; Goel, N.; Chung, S. J.
- Physical Review B, Vol. 69, Issue 23

##
Ground state of the two-dimensional electron gas

journal, March 1989

- Tanatar, B.; Ceperley, D. M.
- Physical Review B, Vol. 39, Issue 8

##
Spin-Dependent Resistivity at Transitions between Integer Quantum Hall States

journal, May 2005

- Vakili, K.; Shkolnikov, Y. P.; Tutuc, E.
- Physical Review Letters, Vol. 94, Issue 17

##
Spin Susceptibility of Two-Dimensional Electrons in Narrow AlAs Quantum Wells

journal, June 2004

- Vakili, K.; Shkolnikov, Y. P.; Tutuc, E.
- Physical Review Letters, Vol. 92, Issue 22

##
Resistance Spikes at Transitions Between Quantum Hall Ferromagnets

journal, November 2000

- De Poortere, E. P.
- Science, Vol. 290, Issue 5496

##
Critical Resistance in the AlAs Quantum Hall Ferromagnet

journal, November 2003

- De Poortere, E. P.; Tutuc, E.; Shayegan, M.
- Physical Review Letters, Vol. 91, Issue 21

##
Metal–insulator transitions and the effects of electron–electron interactions in two-dimensional electron systems

journal, February 2005

- Shashkin, Aleksandr A.
- Physics-Uspekhi, Vol. 48, Issue 2

##
Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells

journal, December 2002

- Jaroszyński, J.; Andrearczyk, T.; Karczewski, G.
- Physical Review Letters, Vol. 89, Issue 26

##
Spin-Independent Origin of the Strongly Enhanced Effective Mass in a Dilute 2D Electron System

journal, July 2003

- Shashkin, A. A.; Rahimi, Maryam; Anissimova, S.
- Physical Review Letters, Vol. 91, Issue 4

##
Magnesium Doping Controlled Density and Mobility of Two-Dimensional Electron Gas in Mg$_{x}$Zn$_{1-x}$O/ZnO Heterostructures

journal, August 2011

- Falson, Joseph; Maryenko, Denis; Kozuka, Yusuke
- Applied Physics Express, Vol. 4, Issue 9

##
Measurements of the Density-Dependent Many-Body Electron Mass in Two Dimensional $\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}/\mathrm{A}\mathrm{l}\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}$ Heterostructures

journal, January 2005

- Tan, Y. -W.; Zhu, J.; Stormer, H. L.
- Physical Review Letters, Vol. 94, Issue 1

##
Charge Excitations in Easy-Axis and Easy-Plane Quantum Hall Ferromagnets

journal, October 2001

- Muraki, Koji; Saku, Tadashi; Hirayama, Yoshiro
- Physical Review Letters, Vol. 87, Issue 19

##
Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems

journal, October 2005

- Punnoose, A.
- Science, Vol. 310, Issue 5746

##
Spin Susceptibility of an Ultra-Low-Density Two-Dimensional Electron System

journal, February 2003

- Zhu, J.; Stormer, H. L.; Pfeiffer, L. N.
- Physical Review Letters, Vol. 90, Issue 5

##
Electronic Transport Properties of the Ising Quantum Hall Ferromagnet in a Si Quantum Well

journal, July 2008

- Toyama, Kiyohiko; Nishioka, Takahisa; Sawano, Kentarou
- Physical Review Letters, Vol. 101, Issue 1

##
Spin susceptibility of interacting two-dimensional electrons with anisotropic effective mass

journal, December 2007

- Gokmen, T.; Padmanabhan, Medini; Tutuc, E.
- Physical Review B, Vol. 76, Issue 23

##
Observation of the fractional quantum Hall effect in an oxide

journal, October 2010

- Tsukazaki, A.; Akasaka, S.; Nakahara, K.
- Nature Materials, Vol. 9, Issue 11

##
Quantum oscillations in two-dimensional systems with finite width

journal, August 1986

- Smrcka, L.; Havlova, H.; Isihara, A.
- Journal of Physics C: Solid State Physics, Vol. 19, Issue 22

##
Sharp increase of the effective mass near the critical density in a metallic two-dimensional electron system

journal, August 2002

- Shashkin, A. A.; Kravchenko, S. V.; Dolgopolov, V. T.
- Physical Review B, Vol. 66, Issue 7

##
Quantum Hall ferromagnet at high filling factors: A magnetic-field-induced Stoner transition

journal, December 2005

- Piot, B. A.; Maude, D. K.; Henini, M.
- Physical Review B, Vol. 72, Issue 24

##
Contrast between spin and valley degrees of freedom

journal, June 2010

- Gokmen, T.; Padmanabhan, Medini; Shayegan, M.
- Physical Review B, Vol. 81, Issue 23

##
Spin susceptibility and effective mass of two-dimensional electrons in ${\text{Mg}}_{x}{\text{Zn}}_{1-x}\text{O}/\text{ZnO}$ heterostructures

journal, December 2008

- Tsukazaki, A.; Ohtomo, A.; Kawasaki, M.
- Physical Review B, Vol. 78, Issue 23

##
Insulating phase of a two-dimensional electron gas in Mg ${}_{x}$ Zn ${}_{1-x}$ O/ZnO heterostructures below $\nu =\frac{1}{3}$

journal, July 2011

- Kozuka, Y.; Tsukazaki, A.; Maryenko, D.
- Physical Review B, Vol. 84, Issue 3

##
$g$ Factor of the Two-Dimensional Interacting Electron Gas

journal, February 1969

- Janak, J. F.
- Physical Review, Vol. 178, Issue 3

##
Indication of the Ferromagnetic Instability in a Dilute Two-Dimensional Electron System

journal, August 2001

- Shashkin, A. A.; Kravchenko, S. V.; Dolgopolov, V. T.
- Physical Review Letters, Vol. 87, Issue 8

##
Single-particle and transport scattering times in narrow GaAs/ ${\mathrm{Al}}_{\mathit{x}}$ ${\mathrm{Ga}}_{1\mathrm{-}\mathit{x}}$ As quantum wells

journal, April 1990

- Bockelmann, U.; Abstreiter, G.; Weimann, G.
- Physical Review B, Vol. 41, Issue 11

##
Valley splitting of $\mathrm{Si}\u2215{\mathrm{Si}}_{1-x}{\mathrm{Ge}}_{x}$ heterostructures in tilted magnetic fields

journal, April 2006

- Lai, K.; Lu, T. M.; Pan, W.
- Physical Review B, Vol. 73, Issue 16

##
Scaling Theory of Localization: Absence of Quantum Diffusion in Two Dimensions

journal, March 1979

- Abrahams, E.; Anderson, P. W.; Licciardello, D. C.
- Physical Review Letters, Vol. 42, Issue 10

##
Excitonic collapse of higher Landau level fractional quantum Hall effect

journal, December 2000

- Scarola, V. W.; Park, Kwon; Jain, J. K.
- Physical Review B, Vol. 62, Issue 24